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  #16 (permalink)  
Old 07-27-2012, 03:07 PM
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Block casting number 3969854.

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  #17 (permalink)  
Old 07-27-2012, 03:21 PM
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Quote:
Originally Posted by krunch007 View Post
Block casting number 3969854.
That is one of those numbers. It shows up variously as a 396, a 402, and a 454.

There's no consensus, but I would lean towards it being a 402- going by the performance you described (although a 402 can run strong) and by the partial VIN that indicates a date of '71 (there were no 427 BBC in '71, except tall deck truck- it's not one of those, is it?). If you can find the date code back by where you found the c/n that may help. It's a code like "D 12 1", or something like that.
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Old 07-27-2012, 05:46 PM
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OK so here are the rest of the numbers. From the block 3969584 and A4-71. The heads I am afraid are disappointing with 336781. I believe you said the 73-85's were not the most desireable. .
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Old 07-27-2012, 06:16 PM
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Ithink what I called the suffix OLB is really CLB. With more research and the rest of the codes I think the motor is (or at least was) a 402 out of a impala or chevelle. I am ruling out the camaro for now since that shows that model as a manual. The heads are coming up as a 73-85 454. Do you agree? So the motor was originally up to 300 hp stock before the lrger heads were added along with the cam,headers, exhaust, updated ignition.

Is there anyway to determine CID without pulling the heads?
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Old 07-28-2012, 12:35 AM
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Does the flywheel and ballancer have external weights
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  #21 (permalink)  
Old 07-28-2012, 12:51 AM
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Quote:
Originally Posted by krunch007 View Post
Ithink what I called the suffix OLB is really CLB. With more research and the rest of the codes I think the motor is (or at least was) a 402 out of a impala or chevelle. I am ruling out the camaro for now since that shows that model as a manual. The heads are coming up as a 73-85 454. Do you agree? So the motor was originally up to 300 hp stock before the lrger heads were added along with the cam,headers, exhaust, updated ignition.

Is there anyway to determine CID without pulling the heads?
The 781 heads are actually one of the better open chamber heads. Compression ratio will be fairly low on a 402 w/stock deck height and unmilled heads, though.
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