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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#73440 02/19/2007 11:57 PM | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | I was just reading the GMC speed manual by Bill Fisher. He mentions boring the 270 out to 3 15/16 to come up with a displacement of 292 cubic inches. For the 302 he reccomends a 4 1/8 bore to give a displacement of 320 cubic inches.
I might have to go back on the 302 pistons... the 4 inch bore may be wearing those cylinder walls a little bit thin. | | |
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