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Old 01-02-2011, 06:27 PM
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Olds engine ID help please!!!

Im hoping some olds guys can clear up some of my conclusion. I have an olds 455 with casting number 396021F. That states 68-71 from what i have read however it has j heads, which from my understanding means it is a 73-76 smog motor. To add to my confusion it has 402294 rh exhaust manifold which should be w30 high performance manifolds. Does this make sense? Is there anything else i should look for to help id this engine? Thanks ahead for any help!

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Old 01-02-2011, 07:38 PM
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Block #396021F is a 1968 to 1972..Exuast #402294rh is1969to1972 W-30s " Z " codes are H/O You didn,t state the casting # on the heads or the letter on them.What did you read to lead you think they are 'J' heads.
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Old 01-02-2011, 07:48 PM
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There is a j cast into the head above the exhaust port. And if it means anything the engine has an egr valve.
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Old 01-03-2011, 08:40 AM
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That casting number block was used through at least 1974. Don't believe everything in the FAQ at 442.com. There was overlap between the F and Fa blocks. The VIN derivative stamp will tell you exactly what year that block came from. The J heads are the crappy smog heads used 1973-76. The EGR intake was used for 1973-76. The 402294 RH manifold was used on every A-body Olds with a 400 or 455 motor from 1969-1972, not just on the W-30 cars. What's the other exhaust manifold?

Here's the VIN derivative stamp. The second character is the year of the block.

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Old 01-03-2011, 11:23 AM
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Thanks, i will check the date stamp. It doesnt really matter either way, its goin in a 52 chevy thats not really built for speed, so im sure the power of even a smog motor will make the car happy!
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Old 01-03-2011, 11:44 AM
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The second digit is a 4. That would make sense to me that it is a 74 engine. The other manifold is covered in a heat shield so i dont know what that says yet...
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Old 01-03-2011, 12:00 PM
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Quote:
Originally Posted by Deadmetal
The second digit is a 4. That would make sense to me that it is a 74 engine. The other manifold is covered in a heat shield so i dont know what that says yet...
Yup. Consistent with the heads and intake manifold.
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