I have a question concerning the bottom end limits. Many people with the stockers tend to run their engines up to 6500. Can the bottom end handle that, and can it handle it.. say once or two times a week? I guess im trying to ask are there any long term effects (within a 100,000 mile period). I want to know because I have a scat 9000 stroker crank and shot peened factory rods with hyperutectic pistons.. which should be better than stock. I am talking about all motor .. no spray or blow.. how much can the bottom end handle without having any problems?

 

I friend of mine had a stock Lt1 with a cam and 4.10s and he shifted at 7,000rpm all the time..and never had a problem...I never saw a need to rev it that high but he did..

 

I make peak power at 6,800 and shift at 7,000RPM. Stock bottom end. I have been shifting over 6,400 for four years now.

With your setup you should be fine shifting at 6,500

 

Shifting at 6500 RPM is NOT fine.

A stock LT1 rotating assembly is NOT balanced past 6000 RPM. I'm sure there are many people who still shift high into the 6XXX RPM range without a problem, but those are exceptions. Over-revving can lead to problems down the road.

Without Cam specs, it is useless to even consider rasing the rev limit into the 6000 RPM range. A stock LT1 isn't going to make power past that anyways.

 

since 1954 when the SBC came out for the 55 model year the only thing holding it back from being a "Revver" was the valve train take care of the valve train and the rest will follow.

Then again I think the rest of you should never rev past 4k. that way you will never be in the lead

 

I have my accel 300+ set at 6250 rev limit and I have come up against it more than once. I have 135k on my LT1 and aside from some small oil leaks I have never had a problem.

 

I have my rev limiter at 6600 and shift at 6400 all the time. No problems yet with the bottom end. As Elis said, if you take care of the valve train, the bottom will follow.

 

My cam specs are posted in my sig. The powerband on the cam doesnt really kick in until 2k or so. So.. as long as I dont rev past 4k and shift at 6500 I should be ok? I had my crankshaft internally balanced at my machine shop with the flywheel and balancer on it. Since I have my rotating assembly balanced correctly, will the 6500 redlines be easier on my engine now?

As for shifting at 7000, whew thats too much for me. I get pretty nervous around 6500 already (on the stocker). Now I have the scat crank, and I know its stronger than the stock crank, a better kind of cast.

Thanks for the replies!

 

That was overall stability, you could run 12,000rpm if you had all the goodies, but the stock bottom end isn't built for running much past 6000rpm continously.

 

I was spraying my stock bottom end up to 6700 rpm and when I pulled it apart it was still doing ok Now with stock crank, 6" rods and forged slugs, I'm running it to 6700 again on the spray.

Elis hit the nail on the head, a good valvetrain setup is a must. Also watch your oiling, some guys have trouble starving the motor at high rpms.