Mistery sbc


New Member
Mar 22, 2020
So I picked up what I believe is a 68 302/327/350 block and crank. Only trouble is it’s missing a number in the casting number. And suffix code I can’t seem to find anything that matches it. Any help would be great


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Veteran Member
Nov 6, 2014
Minneapolis, MN
Hmm, interesting. Many here have more personal knowledge that me but here is what I found. (probably much of what you've already found)

I don't think you have a matching crank and block.

The crank casting number could be from a 283 or a 302 from what I find.

For the block, are you in Canada? Because it seems your block came from a Canadian car. I found two threads looking into your specific oddball casting and suffix code. The partial VIN starting with 7 indicates a Pontiac and the 2nd digit of 8 indicates 1968 year. Full size Canadian cars came with Chevy engines in this time period. (although the Firebirds/GTOs did not) Since the Chevy 302 was not offered in a Pontiac it would seem to be a 327 or 350.



From what I found on this my gut is telling me you have a 327 or 350 block from a 1968 Canadian full size Pontiac car. The crank is a non-matching 283
or 302.

But do your own research for sure.


New Member
Mar 22, 2020
From Canada yes. And that’s about what I found. I bought the block and crank in a parts bundle. I never thought to think Pontiac! Thanks for the help

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