How do you decode date code on 390 motor?

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Mar 9, 2003 | 06:23 PM

390man

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From: ILLinois

How do you decode date code on 390 motor?

I have a 1960's 390 motor in my 1975 High Boy, I was told the numbers underneath the oil filter adaptor can tell date of manufacture of the engine block, is this true? I far as I can tell my numbers are--8CZ9-- does this make sense to anyone? Can you tell me how to decode it? Thanks for your help!!...........390man

Mar 9, 2003 | 09:09 PM

pward76

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From: Urbandale, Iowa

How do you decode date code on 390 motor?

8CZ9 is most likely 8C29.

the 8 would indicate 1968

the C would be March - A is Jan, B is Feb, and so on - skip the I though...

The 29 would be the 29th day of the month,

So, casting date is March 29, 1968

Last edited by pward76; Mar 9, 2003 at 09:18 PM.

Mar 10, 2003 | 06:32 AM

390man

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From: ILLinois

How do you decode date code on 390 motor?

Thank you very much PWard 76 for your help on this, I always wondered what year it was for sure. They always say when you learn something new everyday your day isn't wasted!!! Thanks again.......390man........