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Old 01-20-2008, 07:21 AM
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If it is a 283 block it will be 2 bolt mains and small journal, you can verify with casting #'s what the block is. For compression I second all the comments about heads, it also gives you much better porting which could offset any loss of power from the cmpression drop. By the way , punching 283s to 4 inch bore was a pretty common trick, they were called 301s at the time. We used to do them regularly when I worked as a machinist. The 302 crank is also forged, not cast, the 2 have entirely different seam lines.
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