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HP rating for stock GM main bolts
I searched but couldn't find anything so...
What's the max suggested HP range for stock GM main cap bolts in a gen 5 454? -Running stock forged GM 4" crank, 4 bolt main, 8.5:1 with 5-6 lbs boost, 6,000 RPM. |
Youll be fine with the stock bolts. They can handle alot more power and rpm than youll be running.
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Thanks MT.. But I'm looking to know what I can run these to as I'm building the bottom end for future expansion, I picked up a 6-71 for cheap that will most likely be going on a few years down the road when I get it running and upgrade the drive.
So what is a comfortable HP & RPM range for stock GM bolts given the above set up...700..800..900..1,000hp? 6,500RPM max at XXX HP ? Or to put it another way at what horse power & RPM should I replace the stock main cap bolts with ARP 8740's Thanks |
A slight threadjack here. What rpm ceiling would you use before needing stud girdles?
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Originally Posted by Baja Rooster
(Post 4619739)
A slight threadjack here. What rpm ceiling would you use before needing stud girdles?
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Don't under estimate GM cap bolts. If it makes you feel better then replace with arp (cheap) however I'd be more concerned with a professional balance on your rotating assembly. GM forged 4 bolt forged assemblies are pretty tough. Good aftermarket rods with arp bolts is also extra insurance however. I've only broke one 7/16 GM rod cap and it broke near the bolt. (Weak point) If your planning for future 1,000 hp then you might as well spend the money now. Spend the $2,000 or so now on rods and balance. With that said though I've ran 800 plus with stock GM rotating assemblies however not with extending runs. Achieving a reliable 800-1,000 hp is what's gonna get costly. I think everyone would agree with that. For your current 6-71 I wouldn't stress much over it. We've run 420 mb on stock GM forged 454's with 6 pds of boost with zero problems. Just my personal experience and opinion of course. |
Consider a torqued bolt like a street ho. The more they get torqued and stretched it's time to replace with a new one however first few rodeos doesn't mean their worn out. Lol... just my .02 |
Originally Posted by getrdunn
(Post 4619756)
Consider a torqued bolt like a street ho. The more they get torqued and stretched it's time to replace with a new one however first few rodeos doesn't mean their worn out. Lol... just my .02 P.S. I'm talking about the main bolts not the rod bolts, I'm well aware of the need for better rods at higher HP |
Id put stud girdles on anything over 550hp, but that me, you cant tell me there's no deflection in the stud at 5500 on a non girdled engine, Brad Smith told me a story of a SBC he did a dyno test on non girdle vs adding them, he told me if he hadn't seen it for him self he wouldn't believe it.
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Originally Posted by F-2 Speedy
(Post 4619759)
Id put stud girdles on anything over 550hp, but that me, you cant tell me there's no deflection in the stud at 5500 on a non girdled engine, Brad Smith told me a story of a SBC he did a dyno test on non girdle vs adding them, he told me if he hadn't seen it for him self he wouldn't believe it.
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