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How much can the stock 400 SBC crank handle?

 
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SMOKEmUP
PostMaster


Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Mon Jan 06, 2003 12:06 am    Post subject: How much can the stock 400 SBC crank handle? Reply with quote

How much can the stock 400 SBC crank handle? If the crank needs to be turned is the money better spent buying a SCAT for $200?
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
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1972 Chevrolet Nova

PostPosted: Mon Jan 06, 2003 12:03 pm    Post subject: 400 Cast Cranks: Reply with quote

Joe Sherman, the first guy to really get into 400's, had a 406 in a Nova that ran 9's with a stock cast crank. This was a long time ago and he had no problem. He suggested keeping the revs below 6800.

I had one that ran a best of 124+MPH at a best of 10.72 in a 3000 pound car.
Had over 400 runs on it shifting at 6200 in first, 6000 in 2nd. The engine had 12.7 compression and was not balanced.

I had a valve break at the keeper and play kissy-kissy with a piston at 7 grand through my own stupidity. Anyway when I took it apart the crank was fine. The bearings looked great. I decided to retire the crank so I didn't check it out except for a quick magnaflux test.

Acording to the SMOKEmUP calculator that engine had about 485 horse at the flywheel.
I never dyno tested the engine.
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Steve from Pa
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Joined: 17 Dec 2002
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Location: Punxsutawney
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PostPosted: Tue Jan 07, 2003 10:19 pm    Post subject: Reply with quote

I have a friend that runs some pretty wicked 383 type motors(18degree and such) he has a stock 400 crank he turned about 10 years ago, that he uses as a spare he turns the heck out of his stuff (I think 8700 with the aftermarket cranks and 8000 with the stock)and normally has to use a the backup motor sometime threw the year. That crank went 10.10s in his 83 camero and 8.teens in his dragster. I think one thing to keep in mind is to get the bob weight down as light as possable.
Steve V

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old S&W dragster little 516" Alky BBC, glide best of 7.86 at 168mph
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SMOKEmUP
PostMaster


Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Tue Jan 07, 2003 11:33 pm    Post subject: Reply with quote

Sounds like the stock crank should be up for the job. The crank needs to be turned, I'll find out how much that will cost and if it's more than half of the SCAT I'll go the SCAT route otherwise stock crank it is. Thanks for the info.
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Chevelle70
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Joined: 11 Jan 2003
Posts: 7
Location: Ma
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PostPosted: Sun Jan 19, 2003 12:49 am    Post subject: scat crank Reply with quote

from what I read scat cranks are great buys. If you have 200 to spend i would go with the scat crank. But you may be fine?
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