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Old 10-29-2006, 10:18 AM
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max rpm for a stock bottom end bbc?

i have 454 , with a cam good ported & polished heads roller rockers forged piston and a stock bottom end dont know if steel crank or not. motor already built when i got it. dont no all the specs. so assuming its stock bottom end whats the limit. guy told me i could push it to 6200 rpms but i have it set at 5000 just to be safe. i do not want to blow it up , so what would your experince push it too.???

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Old 10-29-2006, 11:51 AM
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what heads are on this motor? There might not be any reason to go past 4500RPM, let alone 6200...
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Old 10-29-2006, 11:54 AM
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Quote:
Originally Posted by chevelle4542speed
i have 454 , with a cam good ported & polished heads roller rockers forged piston and a stock bottom end dont know if steel crank or not. motor already built when i got it. dont no all the specs. so assuming its stock bottom end whats the limit. guy told me i could push it to 6200 rpms but i have it set at 5000 just to be safe. i do not want to blow it up , so what would your experince push it too.???
I twisted one like that about 6200, in a drag car,crate motor bottom end with forged racing pistons,oval port heads and a 620 lift cam. It would run 6.23 @ 2200lbs.
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Old 10-29-2006, 11:55 AM
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large oval port . # 781 heads ported out
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Old 10-29-2006, 01:03 PM
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I'd keep it to 6000 on a completely stock bottom. Upgrade to ARP (or similar) bolts on the mains and rods and I'd go 6250, but no more on a stock cast crank.
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Old 10-29-2006, 01:04 PM
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I wouldnt worry about the crank. The rod bolts will let go before the crank if they are stock bolts.
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Old 10-29-2006, 02:16 PM
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max rpm for a stock bottom end bbc?

I very seldom turn my solid roller cammed LS-6 big block over 6000 RPM,it has the 7/16 con rod bolts,forged crank and 4 bolt mains.It has lasted for going on 6 years now since I've owned it,no problems with the bottom end!Although I do know one aquaintance that builds big blocks for pull trucks,and with a bottom end not much different from what I use,he turns his motors up to 8000 RPM.
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Old 10-29-2006, 06:42 PM
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Without knowing if its a cast or forged crank and if it has good bolts in the rods...? I would not push it past 5500rpm even with the forged pistons... 69NovaSS is correct on the stock rod bolts being the weak link even before a cast crank... If it has a steel crank and good bolts or aftermarket rods then by all means 6500rpm is fine...

Just pull the pan and find out then hope who ever assembled it did it right no matter what the internals are...
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Old 10-29-2006, 06:59 PM
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is it a Ls5 or Ls6 454
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