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Forum: Pontiac - Street 04-05-2020, 09:27 AM
Replies: 36
Views: 4,206
Posted By 61-63
I've got a '65 or '66 421 block that is .060 over...

I've got a '65 or '66 421 block that is .060 over and I'm going to take it to .090. I've had it sonic checked and it will be ok. So your '64 may be ok at .090 over but I'd have it sonic checked if...
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