435 hp crankshaft

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Jan 23, 2014 | 04:07 AM

Pist'nbroke

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8th Gear

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From: Perth Western Australia

435 hp crankshaft

Hi,
Can anyone tell me the correct casting number for the 1969 BB 435 hp crankshaft?
Thank you!

Jan 23, 2014 | 07:51 AM

L88Plus

Drifting

Joined: Aug 2004

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From: Lubbock TX

Assuming it's a 427 since the 454 wasn't technically available 'till 1970, it'll either end in 6223 (this is the common one) or 7115 if it's the high performance piece. Sorry I can't help more, tagging along...

Jan 23, 2014 | 08:32 AM

Pist'nbroke

Thread Starter

8th Gear

Joined: Jul 2013

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From: Perth Western Australia

Quote:

Originally Posted by L88Plus

Definately a 427 and I have seen the L71 referred to as Special High Performance. Any further information would be greatly appreciated.

Thank you!

Jan 23, 2014 | 11:41 AM

early shark

Melting Slicks

Joined: Nov 2004

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From: Nevada City California

Correct. L36, L68 427's are referred to as high performance engines, while L71, L71/L89, L88, ZL1 427's are referred to as special high performance engines.

Jan 23, 2014 | 11:47 AM

restoman1

Burning Brakes

Joined: Dec 2010

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From: CA

Technically, the L88 and ZL1 engines are referred to as "Heavy Duty".

Ed

Jan 23, 2014 | 11:53 AM

Solid LT1

Le Mans Master

Joined: Dec 2003

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From: Fremont CA

HiPerformance Chevy cranks were Tufftride Treated giving them a harder surface than a conventional forged crank. Tuffride isn't widely done today because it was a cyanide salt bath process. The surface treatment is very shallow but surfaces are harder and more smooth than a raw steel surface. Grinding a crank even just 0.010" undersized can break through this surface treatment. If you want a great crankshaft try giving Bullet Cams a call and see what they can do for you.

Jan 23, 2014 | 08:03 PM

blue427

Burning Brakes

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A word of caution,a 6223 crank was used in a 396 and a 427,there is a difference. If I remember correctly the 3rd counter weight on a 396 crank was 7/16ths and the 427 was 7/8ths. Tom Wilson's book"how to rebuild your big block Chevy has that info. As far as I know a 7115 crank was only used in the L-88 and ZL-1.

Jan 23, 2014 | 08:41 PM

1wicked55

Advanced

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If the 6223 crank is cross drilled and tuff ride finished from the factory it could have been in any 427 including a ZL1

I actually have one that is new and standard. It was prepped for tony delarenzo Vette he raced.