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Re: In need of engine decoder help!
The date code has 6 for the year, so it's a '66 or '76. Given that the truck is a '66, I'd guess it's probably the 250 that came in there. AFAIK all trucks '66 and later had the 250.
A way to tell would be to see if you can determine if the pistons are dished or not; a 250 has dished pistons and 230's have flat top pistons.
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1965 C30 pickup 350/SM420/4.10's (daily driver) thread
1968 Impala 4 door sedan (future driver project) thread
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