How much hp can a 2 bolt main 454 handle. Oct 22, 2012 · My first blown motor was a .
These are motors that are 8 to 10 yrs old now. After 1973, only the Super Dutys retained the four-bolt main caps, with the rest shifting to using two. Apr 13, 2008 · On two bolt FEs, with the common heavy SCAT/Eagle rods, and the tall (compared to a stroker) 428 or 390 pistons, 600 HP combined with over 6000 RPM can start to cause cap walk, even with studs. Years ago, I ran a 454 2-bolt main for several seasons. It's about long-term application of low-RPM lugging torque. Feb 27, 2012 · Hey I have a gen IV 454 from an 88 chevy one ton that i plan to put in my 56 chevy and I've run accross a 6-71 roots blower that I'm really wantin to put on and the guy I bought it from does a lot of drag racing and such and says that the stock internals (crank, rods, pistons, etc) would handle the blower as long as i dont crank the boost up a whole lot. 2 bolt blocks are fine for horsepower levels up to 500 horses. Unlike a SBC, a BBC has much beefier main caps and larger main cap bolts - its all good. Still haven't torn it apart to find the weak link. or if you want to beef up a 2 bolt main set up you could add a stud girdle. Sep 24, 2013 · With the N20, no telling what can happen if the tune is off. The engine was underrated and exact stats are hard to find, but it could go well over 500 horsepower with the right upgrades. 030 overbore (balanced and bluprinted) Cast crank with standard mains and rods Cast pistons w/8. 0 LS handle? Holdener, arguably the most prolific LS engine builder/tester out there, has put both Gen 3 and Gen 4 high mileage junk yard SBE 6. Also, an article in todaysnhra. Jan 8, 2021 · Upgraded Vortec cylinder heads, a more aggressive camshaft, and reprogramming TBI chip to make 300 horsepower or more with a GM Chevy 305, 350, and 454 engine with factory TBI injection. The top end is an Aug 18, 2011 · Tory ACES Member #1890 Team Chevelle Gold #288 1955 Chevrolet Bel Air Unrestored 15,000 Mile Survivor 1955 Chevrolet Nomad 1964 Malibu SS Unrestored 36,000 Mile Survivor ~ SOLD Jan 31, 2008 · Ran a 2 bolt main 396 for years. Remember hp and torque are related so you would have to spin a 396 harder to get the same hp as a larger motor (probably 7000+ at this power level). I am running twin 72 mm Turbos. 500 hp is the "generally accepted" limit on any 289-302 block. 250 inch diameter, and nearly all blocks have four-bolt main caps until 1973. ) then the block could survive making 1,300 hp for short periods (like quarter-mile passes, as opposed to extended time spent at peak speed like offshore racing boats Jul 3, 2012 · I have a 2 bolt small block that could probably handle 500hp. Sep 29, 2009 · Thanks for the info guys. My 68 Camaro went 9. These, with ARP bolts, will handle 500 hp. How to identify a 4 bolt main 454? You can quickly identify a 4-bolt main 454 by looking at the side of the block on the size of the hole. May 18, 2009 · The 73 8:1 compression 2 bolt 454 LS4 with the 781 or 049 heads is an ideal engine to modify. Feb 7, 2015 · A 2 bolt block can handle over 600 hp with arp studs if you dont spin it to the moon , and if you dont plan much over 500 hp oem bolts will be just fine imho. How much horsepower can a 4 Bolt Main 350 produce? A 4 Bolt Main 350 can produce up to 500 horsepower depending on the modifications and tuning. Apr 13, 2016 · The casting featured two-bolt main caps and was the basic foundation for all two- and four-barrel applications. 70/165. Authentication and pre-purchase inspection service still available. I have nothing other then main studs in the stock caps,O ringed for copper head gaskets and bored . He hauled it out for book author Oct 28, 2012 · General Q & A - How much HP can a 2 bolt block handle? - I still have the original 1990 Merc 454 330HP from my boat in my garage and I'm thinking of building a stroker or possible supercharged engine out of it. It can handle up to 500 horsepower with the right modifications, such as upgraded head gaskets, camshafts, pistons, and other components. Dec 11, 2007 · depends. i had in 461 bbc two bolt cast crank. I am building a stroker 521 drag motor and looking for 850-900 hp at the crank N/A. i built many two bolts pushing more then 500hp. Roughly 475-500 hp. BBC have the same register width 2 bolt or 4 bolt. Assuming the valvetrain is unlimited, what rpm can this stock bottom end handle safely and reliably? What is the limiting factor in the stock bottom end, the con-rod fasteners? Sep 30, 2009 · Can the 2 bolt SBC with a cast crank reliably handle around 425 HP with static compression of a MAX of 10. Apr 22, 2013 · There are sever different styles of stock rods. My question is how many rpm can a stock 2 blot main big block handle. Jun 6, 2024 · A 2 bolt main 454 engine can handle horsepower outputs ranging from 400 to 600 horsepower, depending on factors such as the engine’s condition, components, and tuning. How much boost/hp will the block hold? I cant really afford an aftermarket block right now. you do not need a lower end girdle not going to do any good . And the odds of a 2-bolt failure above 1000+ hp increases steeply. A good balanced assembly in a 2 bolt main motor will put out much better power than a stock assembly in a 4 bolt main. I see no problem with a well setup BBC 2 bolt going into the 700 hp range. Can I built a 500 ft pound 383 stroker with this Jun 21, 2012 · This 4 Bolt stuff is way overrated at output levels most guys are running! Also the 2 and 4 bolt block construction is the same. theres noway to say how much HP a 2 bolt can take, or anything for that matter,RPM is critical, recipitating mass, the balance, is it normally aspirated?, high compression, these all play apart. Nov 15, 2018 · how much is a typical cost for installing 4 bolt splayed caps on a 2 bolt BB and is it even worth it? I have an eagle forged 454 crank, scat rods, and old trw 11-1 pistons that I'm thinking about using. There is a book called "How to hotrod big block Chevys" that covers crank interchange and fit issues as well as the 2 vs 4 bolt blocks. 3. 2 years 10,000 miles zero problems with the engine its a Jan 10, 2005 · hi. Dec 25, 2009 · I hope you meant 700 hp not 7000 hp. 060 over). 36 gears. If you get a good deal on a 2 bolt main used production block, might consider installing aftermarket performance 4 bolt mains with the outer bolts splayed (a machine shop can easily fit these). Their sub-8. I shift at 5300 cause im not sure if the bottom end will handle 6500. Times are in my sig. 240-inch deck height (an option of 9. It has Mar 29, 2018 · Re: How much HP can a stock 454 bottom end handle? The main issue is compression. Is "stock" with flattop pistons and stock cam? You can simply swap out the cam, but will be limited unless the heads are redone with better springs, correct heights etc. 2 bolt mains should be no problem if quality bolts or studs are used at the hp levels you mention. Jan 21, 2012 · I would purchase splayed 4 Bolt Main Caps and the threading kit, so you are able to tap the new threads for the additional bolts. 4L with a bore and stroke of 4. The factory 2 bolt main block has been produced in large numbers, making them easier to source and available at a lower cost, helping the bottom line of your budget. 600 HP reliably, you need an aftermarket block. 030 over 454 block (461) it went 12 years and almost 400 hours of beating the crap out of it. I'd like to end up with a combo that'll make 500-600 boosted horsepower (on a budget of course). Indeed, many do. not to mention that normally a power adder car wont have a deep Jul 15, 2000 · 1969 Chevelle 300 454! finally, 29-3200 stall, TH400 and moser 12 bolt 3. In the case of the 351W, he is pretty much right, its a gamble. I am clearly aware that 4 bolt main engines are better. Dec 2, 2010 · I found a 2 bolt 1972 454 3999289 block that is a standard bore for $300. Jun 17, 2023 · Each main cap is attached with four bolts, as opposed to a two or three bolt main. This motor will be 10. if the block needs line bore and then you could move up to main studs . Dec 12, 2004 · 4-bolts are way over rated, Ive never busted a 2 bolt. So, he dropped the price to 150. How much HP can a 454 Mark IV 2 bolt block handle with stock cast crank and rods. Jul 31, 2016 · basically right out of a 1973 truck. Stock cranks are pretty strong to the have large journals and alot of overlap and again I have heard 700-800 hp+ Feb 3, 2021 · Problem with factory 400 4-bolt caps is the location of those outer bolts. Any good machine shop can fit and line hone these caps to fit any 2 bolt 396-427 Jul 18, 2014 · In the meantime i want to spray it and start having some fun with the car. ?. I've heard cap walk is really bad as it can turn the metal to dust and that then goes through the motor. 5. And a 2-bolt main coverted to aftermarket splayed caps are much stronger that factory 4-bolts. cylinder wall started to spilt my first season racing and by the end of the season it splitted the whole way and even the good crank,2 rods,2 pistons inside couldnt take a cylinder full of ming water Nov 26, 2019 · How much can these safely handle if they are in good shape in a good well put together 4 bolt GM block? How about if it is double keyed for low boost? Thoughts? Looking to do a low buck low boost (5 lb's) 427" based engine. I put together a mild 350 small block chevy several years ago for my 69 Camaro. 0 LS engines on the pump with nothing more than increased ring gap, a boost friendly camshaft, aftermarket heads and intake and made north of 1,400 horsepower! Jan 13, 2007 · that boss 302 service replacement block would be best left to a collector if it hasnt been used and new like it says bets to buy a new boss 302 block or dart ie or ies i can only imagine what this 427 nos block would bring the guy over the hill has be nice to have it but for that price get a fms or dart block a few years back i passed up a freshly machined 1970 boss 302 block 30 over cracked Oct 8, 2004 · A 396 2-bolt motor with stock rods and a cast "Nodular" crank can rev to 6200 - 6300 without worry. Just a little over 600hp and high 400-500ish ft-lbs of tq. Dec 26, 2019 · The guy had it for sale for 225 bucks, valve covers to oil pan. 035 area along with appropriate pistons for the stated compression with my Vortec top end. Jan 25, 2008 · As far as 400 SBC's go I think that the 4 bolt was the weaker of the options because GM removed a lot of casting material to compensate for weight, which they figured out was a bad idea and just went back to the 2 bolt setup, after only a few (or maybe just one) year(s). If you can get it for a good price, it's a much better starting point for a high HP engine than a stock 454 block. A 4 bolt main is stronger and more reliable than a two or three bolt main. the more RPM with a power adder the more cycles of pushing the mains out. 2 BOP 10 bolt has a 27 spline pinion and 28 spline axles. The first one showed moderate bearing wear after one season of street driving/racing. Shiftlight is set for 6800 rpms. cast crank too! get good rods and make sure your clearences are all on the money. Sep 27, 2012 · I have a stock 454 block that has been splayed with billet main caps and also studded. 1 and will be powered by 2 92 mm turbos which our capable of 1000hp at there full boost potential. Jun 11, 2009 · Nothing a mild cam, intake, carb, and a set of header won't fix. Re: About how much HP is a 2 bolt 454 good to? 08-10-02 04:08 PM - Post# 119062 In response to NewmanZL1 I run mine to just a tick under 8000 rpm,it makes 708 hp at 7300rpm,and I shoot it with up to about 350 hp of shot,{on the nitrous the tall gears make it scream thru the lights}I run a jet that claims 400 hp,but I pull out a generous amount of timing and use 8. thats going off the millions of engines out there and the most likely one you'll come across. That is the 460's limitation also being the small 1/2" main studs and also the same 750-800hp for the same reason. Apr 1, 2007 · That means a 454 can support almost 600 hp (454 x 1. In the very least your 2-bolt block will be an extremely high maintenance engine. turbomustangs. These truck engines were ALL 4bolt main. Estimating 450-500 HP. Dec 28, 2020 · Building a 454 probably 500-520 hp@6000-6200 rpm using a 2 bolt block. 781 have large chambers. It has a 2 bolt main with an aftermarket stud kit, TRW forged flat tops, stock crank, stock rods with ARP bolts & polished beams. The HP level was well within limits, but I agree; keep your HP peak (cam choice) at a level that doesn't constantly require more than about 5500 rpms to get your power. First setups were blown w/ Procharger's D1. May 2, 2006 · The number of bolts that hold the "cover" on is just a coincidence. Smog-era big-blocks get a bad rap. Im running on the lambda scale and just turned it up to 10psi and the readings are . 250-inch larger in diameter. As for the Powerglide, the main thing I was thinking was simplicity (no mods to the shifter linkage or cutting holes in the floor) and less power loss through the drivetrain. 2 bolt block, cast crank, 3/8 rods. I have seen dyno results showing 345hp and 490 ftlbs from a 7. The 73 454 MK IV came with either a 049 @ 122cc Vol Chamber or a 781 118cc Chamber. 2 in my 66 for a year. Also, depending on application and build specifics, certain block upgrades are advisable with such high hp builds. 454 w/. " Apr 18, 2023 · A 2 bolt main 350 Chevy engine is capable of producing up to 350 horsepower. Check out www. But what would our 31-year-old engine Oct 28, 2012 · General Q & A - How much HP can a 2 bolt block handle? - I still have the original 1990 Merc 454 330HP from my boat in my garage and I'm thinking of building a stroker or possible supercharged engine out of it. May 29, 2023 · A 2 bolt main 350 engine can handle up to 400-500 horsepower. Let us know how it turns out Sep 8, 2009 · 350 2-bolt at 750 hp, no way!!, a 4-bolt won't even take that for long. 0-1 compression (NOT forged) Two bolt mains Stock iron oval port heads Feb 3, 2008 · The rails can't be ground on much before you hit water or the main bearing oil feeds which go down the side of the block. Apr 10, 2004 · I have been running a 2 bolt main 454 block for about 5 years now,but the car has been sidelined in the body shop for the last year. Save up and buy a Dart block. 66300 rpm limit. We pulled them apart to freshen the up and everything was perfect. If you have a forged crank and a 4-bolt main and either the good rods or upgraded with ARP rod bolts as a minimum, 7000+ is easy as long as the valvetrain is up to the task. A Mark IV can get you closer to the 900-hp mark. 6-6300 rpm limit. Over the years, I've had this done to 3 BBs. Just how much horsepower a stock Pontiac 400 or 455 block can handle is a Sep 29, 2002 · You don't need a four bolt block. Bowtie blocks with splayed 4-bolt mains with center studs should handle over 1,500 HP, and are good to well over 8500 RPM. It would easily be my choice. 3 are extenally balanced and one in internally balanced. Just a basic truck engine. I asked him if it was 2 or 4 bolt main, he said he didn't trust his engine stand to turn the engine over to take pan off. 44" bore), oem 460 cast crankshaft, oem iron passenger car heads, oem main bolts and oem head bolts. We then switched to the 2-bolt splayed cap block and noticed the improvment. as long as line bore is good and caps fit up nice in the block resisters. Every lt1 out there is 2 bolt and most of them that we build are 450+hp with no probs. Depends on who you ask like stated. 600hp is the max for 2 bolt BBC. you don't have that cylinder pressure in an NA deal. May 22, 2008 · I would limit the rpms to 6500 rpm for a 2 bolt, cast crank, cast piston, stock rod 350. Heads, I am considering Merlins with a possible roller cam. John Oct 16, 2022 · How much horsepower can a 454 4-bolt Hauptwerk take? A properly machined and installed two-bolt cast iron lower crank would be good for at least 550,600 horsepower. ive seen some failures blamed on 2 bolt mains,but i honestly dont know if the "2 bolt main"was really to blame. I would be replacing the pistons with forged slugs. 19th 2009) it sent #6 rod through the oil pan in 3 places Apr 22, 2007 · C3 Tech/Performance - 454 2 bolt. 421 sbc. Oct 15, 2023 · Can anyone say what the limit to a 2 bolt main block is? I've heard a range from 450-600, but I've never seen an engine failure due to the caps or cap fasteners. Is there a true way to tell without pulling the pan? I have a 73 3/4 truck that has a 454 and it looks like it has the smaller plugs so I would think it is a 2 bolt main. The mains arent the problem, the thin cylinder walls are. in short bursts. Oct 29, 2012 · most will make 350hp without blinking,, cast crank and pistons,2 bolt mains. I got about four 460/468 BBC running stock steel GM cranks and they are at 700 to 760 HP turning 7200 to 7500 RPms and not having any issues. Sep 17, 2006 · Ditto on much of the above. I cant remember if he said it was a 4 bolt or two. BTW, my 2 bolt '73 454 block has been beaten on for many miles and Jan 9, 2005 · I was just wondering if I really need a 4 bolt main bottom end? or will the 2 bolt be strong enough? Below explains what I have now, and where I want to go with it. the power adders make enough cylinder pressure that they are always trying to 'push' the mains out of the block. 4 main bolts and a steel crank can handle 700 hp and 7200 rpm. Nov 12, 2017 · My neighbor just had a 400 stroker built. Nov 1, 2006 · The Ford 9" route will take away cash from my frame/straight axle project for the car or the aluminum heads that Brad54 keeps giving me shit for wanting. The amount of horsepower a 2 bolt main 350 engine can handle depends on various factors like the condition of the engine, quality of parts installed, and type of fuel used. 2). Look at the casting seam on the crank throws. If I fill the Feb 5, 2024 · How much power can a 2-bolt main 454 handle? A primary 454 engine with two bolts has 500–550 horsepower with good reliability. Chevelle Malibu ss 64 489 BB with parts from Lewis racing Sep 3, 2009 · You can get an 8. how are you gonna know if the main cap lifted Oct 24, 2006 · 2001 Trans Am WS6 - Black 6 Speed 1971 Maverick Grabber - Yellow/Black C4 302 1968 Camaro - White/Black 327 Th350 1985 Corvette Z51 Auto Jul 27, 2009 · how much HP can a stock BBC block handle? There's a guy down the road with a 454 stock heads, crank, rods, flat tappet off the shelf cam and it runs on pump gas Dec 10, 2011 · Hey guys I was wondering what's the big difference between a 2/4 bolt main. Caps did show some walking, but I spun it 6400 rpms 300+ passes per year. Jun 21, 2020 · How much HP can a 2 bolt main 454 handle? Sometimes, it can be difficult to determine the exact amount of power a two bolt main 454 engine will support. The engine dropped the number 7 exhaust valve 2 years ago so I just pulled it and built a new engine. May 9, 2008 · I've heard from several people that 1000-1200 is on the high side for a 4-BOLT block and you'll need every bit and then some for 5. 85 in a 3350# 64 Chevelle with a2. If RPM's are kept at 5500 RPM or so cast cranks and 2-bolts are fine in a pleasure HP marine engine. 5 psi of fuel pressure instead Mar 25, 2016 · power adders an NA are 2 different things. the bigger main bearing daimeter pushed the bolt pattern outboard, and put those 2 outer bolts drilled right into the weakest area of the main bulkhead/crankase, thus actually makng it weaker than a stock 2-bolt block. The 8. Feb 9, 2021 · The Chevy 454 engine is a 454 cubic inch big-block 7. Jul 13, 2006 · As for the blocks with stock 2 bolt caps the are good to the 800 hp range and installing 4 bolt caps I have heard of guys pushing the to well over 1000hp. I don't think that in a street engine it will matter. I'm building a 2-bolt with studs mains/heads I'm hoping it will handle about 650-700 on Nov 17, 2013 · Pretty much the same as a stock 2-bolt. Jun 9, 2023 · So, how much hp can a 6. Nov 20, 2006 · my non studded 2 bolt runs 10. I always like the additional security of having 4 Bolt Mains, but the early 327s were all 2 bolt main motors and the L76 was rated at 365 hp. Sep 15, 2004 · General Q & A - How much power with a two bolt main 454 - Hi all, Looking for some advice on an engine. Mains were not studded. Jun 19, 2006 · Tech Help. Sure, its another improvement, but not the most important, by far. I think he said it was running chevy 454 rods. Jul 22, 2007 · 2 bolt mains w/ ARP bolts, GM forged crank, 3/8 truck rods with ARP bolts & Speed Pro hypereutectic pistons. . Jun 11, 2011 · My 1994 LT1 "Block" cut down too 9. 2 bolt main block were never designed for stroker cranks Some people say that the old Chevys and Mopars from 60s and 70s are no good for boost in general, due to shit cast iron quality and weak 4 (or even 2) bolt mains in Chevys specifically. The biggest problem is your dealing with a 2 bolt mains, and 2 bolt mains on a small block aren't worth a damn for big power like your talking about. I don't know all the specs but it dyno'ed at peak HP 723 hp 678 torque. 200-inches), a 5/8 Feb 10, 2012 · my car has a 1970 396 (402) not sure if its a 4 bolt main or 2. 003 deck height, 4. 2 Chevy 10 bolt has a 25 spline pinion and 28 spline axles. May 28, 2007 · I would recommend ARP main studs to help on the stability. 4 bolt mains and a steel crank can handle 700hp and 7200 rpm. This engine was in a boat and has had what looks like a basic rebuild but nothing fancy. If you use studs I have seen many 500hp. Besides having siamesed extra thick cylinders, the main cap bulkheads are also machined from the factory. Just need to move the spring perches. Short throw, slower piston speed, and lower internal weight? Thank you for all your input. Racing engines that are used for Mar 31, 2010 · Bolt, If it has just under 4. If you open the housing, counting the bolts on the ring gear will tell you what it is. The best 3/8 bolt rods are the rare "dimple" rods or the HD. Remove the main caps for installation by your machine shop on a 2 bolt 454. You can buy better aftermkt rods that don't have a zillion cycles on Jun 7, 2010 · We take a junkyard 454 short-block, and without taking it apart, bolt on a new top end and other parts to make 700 hp for less than $2,500. Perm a-cool engine oil cooler/fan combo (since it's a street/Hwy driven deal) Oct 17, 2008 · It had about a thousand passes on it, or more. No improved rod bolts or pistons etc. The material is there all GM did was skip the step where the blocks were drilled for 4 bolt caps! Dec 29, 2005 · My main concern is the presence of a lot of cast parts and a 2-bolt main. I have build 500 plus horse bracket engines with 350 2 bolt blocks and cast iron cranks. Thomas Jan 12, 2009 · The 2 bolt block will be fine for revs to the 6000 range. Apr 13, 2009 · If a competent machinist does a full inspection and finds minimal core shift and no casting flaws, and then the appropriate upgrades are accomplished (billet four-bolt mains, etc. I already have the block and would like to have it machined for the 4 bolt caps and put a forged rotating assembly into it. Balanced! Hammered on and ran to 6000 regularly with no worries. Dec 31, 2006 · While IMO a 600hp 396 can be built, a 496 at the same power level would be more streetable. The guy who built the engine said the cam should make power to 6500 rpm. By the time you have them magged, prepped, bolted and resized. Sep 15, 2004 · General Q & A - How much power with a two bolt main 454 - All above are pretty much correct. 060" over with it. Can you make a 2 bolt main into a 4 bolt main? Nov 20, 2009 · if having a 4 bolt main lt1 is what you like you could alwaya start with a corvette block theyre all 4 bolt mains. Finally ended up cracking the crank and am stepping up to a 460 this year. "thumb" rods. 55 @118. my car weighed 3300 lbs and i rewwed the engine constantly over 7000 and later sold it to a super comp car where it still lives and breathes. Oct 18, 2010 · I sprayed 175 HP shot at WOT for 2 years in the eighth mile EVERY TIME if left the line. Nov 2, 2006 · Dont know about QC of early block vs later one. Craig Dec 22, 2009 · At about 800 HP I see the 2 bolt early 454 blocks (3999289 casting) start to have main cap fretting between the cap and block. Thats on e85 fuel also Oct 22, 2008 · If you haven't already bought a block yet, might look into a new GM Bowtie 454 block, they are much beefier than the production blocks. Furthermore the engine was consuming 10 pounds on N20 every week. That is the general limits but there are exceptions to the rule. 90's. Factory 4 bolt main? We are talking late 60's early 70's blocks (back when they were good). I asked if I should spend the extra $300 on a 4 bolt main insted of a 2 bolt and the answers were plenty Feb 10, 2005 · 4. 20`s in a 67 camaro with a 2 bolt 454 shifting about 7,000 rpms. It was straight out of a station wagon engine, we used the whole engine, cast crank, two bolt main block, 3/8" rod bolt rods, oval port heads and all. Nov 20, 2003 · Had a Scarab with two - 2 bolt 454's which dyno'd at 500 HP each, normally aspirated. Nov 6, 2011 · A very good friend of mine is running 10. Jun 13, 2014 · How to Get 700-plus HP on Ford's 351C Engine - Hot In Cleveland. 25 x 4 inches. 3L ZQ8 black on black ACES#7897 Jul 19, 2011 · yes mate they are similar utes, wb is a bit squarer in the curves and corners, thanks for the info, im going to put a more basic question out there, '' using a stock 2 bolt 454, what parts do i need to beef up to handle 500hp? i. Would a cast bottom end withstand this??. Oct 22, 2012 · My first blown motor was a . My only suggestion is to have the block align honed. Feb 18, 2012 · I am going to start a 408 Cleveland build in the near future and I was looking to see what a stock 1972 351 2 bolt 2v block is good for in terms for a horsepower limit. I have a stock 454 4-bolt block with studs and half filled with cement. The two bolt main 350 can handle upwards of 500 horsepower with the right modifications. I'd much rather have a dart block, but this is primarily a street motor with a target of around 800-900 hp. Generally speaking, if the engine has a steel crank, then it should be able to withstand around 450 horsepower during short periods of Wide Open Throttle (WOT). You can make a 2 bolt into a 4 bolt with a set of caps and a competent machine shop. I personally have a 2 bolt with 420 motor and have sprayed it with 100hp nitrous shot for 14 passes and drove it 60mi home at 3400 rpm. Aug 21, 2017 · 2 bolt block will live at 750 HP with main studs, so more than that. I know its a cast Jan 13, 2004 · 1. Glad to hear that a stock 12 bolt will work for me. May 25, 2022 · The two bolt main 350 can handle a fair amount of horsepower, but it is not as strong as a four bolt main 350. you can use a ARP new main cap bolts if you feel the need if line bore is good. 4K stall. Max safe bore is 4. The thicker cylinder walls will also be much more rigid but the Jan 22, 2023 · Builders say a stock Gen V block will handle 650 to 750 hp, depending on pump gas or race gas, and a two-bolt main limited to around 600 hp. crank was very carefully prepped and i had 6. I know a 12 bolt and a 9" will be stronger and the ultimate set up so thats understood. I run 535 hp everyday on a 2 bolt main 454. Two bolt main converted to straight 4 bolt main's with Diamond Billet caps. 73gear-Lunati cam'd 72 El camino-454, th400 stock Oct 11, 2020 · I ran a bone stock 8. com, it stated that "Factory production blocks with 4-bolt main caps can reliably 800 HP. 52 first gear M-20, 4. Nov 7, 2002 · My cleveland is making roughly 600 hp with a 2 bolt main block. Oct 28, 2002 · A two bolt with a good crank, 3/8 ARP rod bolts and main stud kit will take an easy 600 hp, 550+ ft/lbs. Like. 5:1 cr 454 with a tiny 202/210 flat hydro cam, headers, rpm intake, and 750 holley. the engine ran 10. General consensus at professional machinist and engine builder sites seems to be 450 hp for street/strip but only 375 hp circle track for the 350 2-bolt because of the small contact area between the cap and the block. Jun 13, 2006 · Hi Freebooter, I have been told on this site that a 2 bolt main is good for up to 600 hp. 53 @ 142 and shifted at 7000 in my Monte and it weighed about 2700lbs with me in it. Engine Mar 19, 2012 · Casting_id Casting_number Casting_cid rated_hp year Deck main_caps Info 33 14015445 454 CID N/A 1978-87 Normal 2 or 4 Bolt Main This is what I get. It responds excellent to basic modifications such as a 266H or 268H cam Holley 750Dp/Performer-2 Intake and Headers to get trouble free 400+Hp and tons of torque. Oct 7, 2005 · Depends on what type of 351 your talking about. The four bolt main is the preferred platform for building a high horsepower 350 engine. The engine uses a relatively simple overhead valve design with 16 valves total (2 valves/cylinder). 3x's at 3400#. 825 deck height), extra-thick siamesed cylinder bores (which allow for large displacement capacity, and a max bore size of at least 4. There is good data available and proof of reliability with our testing, but first let us examine the advantage of a 4-bolt block and what stresses the main caps of the block are going through. Picked up a set of 049's/performer intake/standard bore 2 bolt block for peanuts and starting to search for the parts to bundle this deal up. Feb 4, 2014 · Additional features are 4-bolt main caps with 7/16-inch bolts, full main webbing for the utmost in bottom-end strength, 9. Next season add two 6-71 Blowers and was pushing over 600hp for two seasons (and these motors were romped on). I cant see how that little bolt can add much strength, if any. it`s gone flat out 8. the crank Mar 24, 2008 · The engine has a cast crank, two bolt mains, thumb rods, 781 heads, stock cam/intake/carb. Feb 7, 2008 · I have a 454 BBC 4 bolt main old school block with High perf rectangle port heads, and I will be putting a eagle lower end which will make it a 490cubic inch. That said, we do have a forum member pushing a 4-bolted D0VE block to a documented 1400+ hp with twin turbos and N20. Using the same multiplier, a 496 can support 645 hp. Dec 31, 2014 · 500 hp low rpm no power adder no need for four bolt block. You`ll be fine with a 2 bolt main. You can make alot of horsepower with 2 bolt mains and a cast crank, with the power level you are trying to achieve, I wouldn't bother even thinking about a 4 bolt block. 5:1 454 without breaking it on the first pass? ’67 Chevelle - Build In Progress Street-legal NASCAR F-150 May 12, 2004 · How much horsepower can you safely push in a 302 with just the 2 bolt main? If I were thinking of building a motor to drop in a classic mustang, what would you all recommend (302, 460, 289 etc)? I plan on getting mine pretty soon, and the first thing I want to do is get the motor and tranny figured out. 8 ford rear from a late 80's-mid 90's Volvo without narrowing it in a 62-67. Nov 5, 2009 · Hi Dave, Thanks for the information. The BOP rear end is a little stronger, but parts are not as common and are also more expensive. 88 rear w/ spool, 28 X9 Goodyear slicks and have only broken it 3 times in 3 years. Oct 22, 2006 · Its not so much a question of what block, but the quality of the parts used. However, even so I`ve delt with small blocks (poor mans engine) and not big blocks I can say I have never seen a small block, or big block for that matter fail through the main caps. The 2 bolt blocks are the same castings as the 4 bolt blocks, they just dont have that extra little 3/8" bolt in them (the mains are cast for it though). The Bowtie CNCs and the aftermarket blocks, Dart and Merlin, have relocated the main bearing oil feeds with a priority main system to eliminate this problem. I know a guy who has 2 '66 12 bolt housings that would fit your car with no modifications. I've done both 4 bolt and splayed 2 bolt conversions on blown 355's. Aug 12, 2013 · It's ASK ROGER time! We just uploaded the latest ASK ROGER video and are pumped to announce our first WINNER! Congratulations to Jerad White on getting selec In fact, the MK IV shares the same bore spacing and main web position with its W-motor ancestor although the big-block main journal is roughly 0. The factory's 4-bolt system isn't made about "horsepower". e. 535 c&a rods and light venolia pistons. Probably would run it to 6500 without issue. com for split-block stories. (flat cap not stepped register) 8 quart Hamburger oil pan, Melling HV oil pump with steel drive coupler. 030 bore (355 inch) with 1/2 fill. These engines are BIG truck only (Coke truck, dump truck, school bus, etc). 2 bolt main converted to splayed 4 bolt caps? 4. Is a 4-bolt main line better than a 2-bolt main line? Jun 1, 2010 · The 2-bolt main engine is capable of handling more power than the trans in the Fiero will handle reliably, so i wouldn't be worried about the engine, just with trying to keep power low enough to keep the driveline together. I run 34 degrees to start out and at 10psi take it down to 30 degrees total. Splayed ductile or steel main caps on a 2 bolt block is as strong as you're gonna get when using that OEM block offering. Maybe 1 pass, maybe 10, who knows. We run a cast crank and 2-bolt mains in our Corvette and turn 6500 RPM and turn 11. Jun 2, 2004 · Some 396 blocks will clear a 454 crank, it sort of depends on the block. A local friend of my Dad's has built a couple of V8 Fiero's, both manual trans, one with a 350 and one with a 305. This is a four-bolt main 351C D2AE-CA block Jim had put away for safe keeping years back. it might give up way before a cast piston/crank one will. bolts, rods, ect?'' obviously i need different parts then standard to make that power, but im trying to save money Apr 10, 2015 · A two-bolt main, cast crank bottom end, properly machined and assembled would be good for at least 550-600 hp. In my mind, people put way to much importance in the 4 bolt main thing. 77 at 123 mph all day long. 310" (. The main webs can't handle that much power for long. Jan 2, 2017 · I read for years that 600 hp and 6000 rpm was about the limit for a 2 bolt block. 14/137 with 1. Aug 17, 2022 · 2 bolts have narrow registers look at the 400 2 bolt block the left the registers wider because of the stroke. will oem main bolts work or should I go ARP main studs? Save Share. how much can i put into a stock 8. 90 racers run 2 bolt BBC's. You're going to drive over the crank with a 2 bolt block and the amount of HP you NEED. I don't think any more detail is available for blocks, such as dimensions, bore spacing, etc Feb 24, 2009 · 70 Monte Carlo-461,th400 3500 stall 3. Click to expand Nov 12, 2007 · Make sure you have a good stud girdle to hold all the pieces together. Mar 24, 2003 · You might be suprised to see how many 9. I used a straight up 2 bolt with arp studs in my EMC 327 chevy and beat the hell out of it. 5 : 1, with a rev limit of 5500 or 6000 RPM? I'm contemplating boring 0. 3 = 590. 20's in the quarter using an unmodified oem 2-bolt block (4. It will be a four-bolt; suppose the hole is large and a two-bolt if it is small. 54 60 ft. Approx 700hp w/ 14lbs on pump gas. Many moons ago (before there were 460 parts everywhere), the car pictured below ran 7. On an otherwise stock low compression 454 engine, 325hp+ and 450 ftlbs+ can be obtained with a few bolts-ons. 250" bore then it's untouched. Block should only need clearancing (notching) for 1/4" stroker using aluminum rods. I was pushing approximately 650 hp to 7500 rpm and lost oil pressure. Made 15-20 high 10 second passes. Guy across the street has a 2 bolt 454 with a 671 blower on it and its beat on alot. Just keep in mind that the output of the engine has nothing to do with the longevity of a rear end. I have seen an autozone 350 short block dragged raced every week for 2 years using 6500 rpm shift points. We had a 1/2 dozen of them, and one killer 454, with a steel crank, 7/16" dimple rods, 4 bolt main block, and 990 rectangle port heads. This a a super low budget deal. I'd call it more of an RPM and weight issue than HP, but to make power up there, the HP comes with the RPM LOL. 73 gears. on a 2 bolt main 454, Hydraulic nothing cam, Iron Oval heads, dual plane intake, with a 850 carb SPrayed it like that in 1/4 a dozen or two last time I did it in the 1/4 (Nov. Apr 5, 2004 · A 351W stock block is limited by the 1/2" main bolts and only being a 2 bolt main means the caps will start walking around 750-800hp if using high quality main studs. Everyone seems to believe its a reverse engineered 12 bolt. Save Share. Dec 21, 2004 · The 8. Aug 13, 2023 · As a “large-journal” engine, the main-bearing journals are 3. Undoubtedly, it is the most straightforward identification of a 454 4-bolt main. Jim Escamilla: Our best-seller is our 454 four-bolt main Sep 28, 2017 · At the Dyno. 0:1 compression ratios, tiny cylinder head ports, and anemic camshaft grinds are the main culprits. Stock 2 bolt main? (bolts or studded) 2. I don't think they made a whole lot of 4 bolt 454's. Additional reinforcement and adjustments may be required if the range is exceeded to ensure lifetime and functionality. If it a fine line, it's cast, which can still handle 500 hp or so. ARP main studs minimize that. the question has come up about how much power and torque a 2-bolt engine block can handle reliably since these are much more available. I am wondering if a two bolt main bottom end will support 450 horsepower. ray Mar 27, 2013 · A 400 SBC block produced with 2 bolt main caps is a stronger block than the 4 bolt main version even though the main cap clamping force is greater with 4 bolts. Girdles help, but all they really do is buy you time. I know a couple guys personally running roots blowers on stock 4 bolt blocks over 1300 hp. I believe they are Pro-comp brand? Lazer Apr 6, 2008 · I built a 73 2-bolt 454 with the stock cast crank that made 450+ and occasionally saw 6000 rpms. 73 on that scale. The problem with stock rods is. 97 @141 the other day at the track and the last chassis dyno showed 1104 hp and 985 torque at 6200. Also, what's the ticket for the best value aluminum heads. - How much hp and torque can a 2 bolt 454 handle on the safe side? (Stock 73 454 engine, evaluating to not be stock anymore) Sep 21, 2007 · I generally agree with the above. Thinking about the $999 eBay heads but haven't heard much on them. I know there are some variables like balancing, etc Has anyone seen a block actually fail due to power alone (not a broken part, rod, crank, cam)? Jan 1, 2009 · I believe the rule is that if you have the larger plugs on the side of the oil filter housing, it is a 4 bolt main. Have 6 counter weight crankshafts raise hell with 2 bolts running over 6800. even if the one you find has forged everything and 4 bolt mains, it don't mean anything. Minor changes to accommodate a one-piece rear main seal and hydraulic roller lifters occurred with the advent of the Gen V and later the Gen VI engines in the 1990s. First one piece rear seal is '91 Gen V. a Nov 2, 2008 · I'm going to go against the grain and say that for 450 you'll be just fine with a 2 bolt as long as you use arp studs. I have a guy that has built sheet and all 2 bolt main machined and all with an eagle crank shaft cost him $800, Comp can shaft $280 it cost him performance pistons, rods n intake for $1100 because he needs the money had receipts from engine shop and papers n work for everything the build sheet. Some say more if it is carefully assembled. The factory 2 bolt main blocks are Nov 30, 2005 · I just bought a 454 and need to make some decisions on the rebuild. I would like to know for sure with out pulling the pan. It's a 880 block with a 2 bolt main. I just got it home and dropped the pan. 030" my 70 52K block, decking to get the quench in the 0. 450-inches is available, which allows for a possible effective barrel length of a 9. Mar 4, 2024 · Speaking of 2 bolt vs 4 bolt main 350, let’s dive a little deeper into how much hp can a 2 bolt main 350 handle and what is a 350 4 bolt main. I ran a best of 9. By the way, can you ever really have too much torque and horsepower? Didnt think so. Sep 1, 2004 · First, locate an old 366BB. I have about 300 passes on raw motor making 720hp,and about 75 pases on the bottle with the 300 jets in it,so it has made over 1000 hp on more then Dec 21, 2008 · I am building a low budget fun 454 for a friend. You can have a thousand HP in front of a 7 1/2" open diff and not hurt it if you can't hook Apr 22, 2011 · I've run 11. 2011 Chevy Colorado crew cab 5. cgnb waquq fzzo bwwaqo fclwsi dsnwy ibsri ipvwbn oegie mnykyfs