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A 307 is a 283 with a 327 crank. You can look up specific dimensions at mortec.com

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15y ago

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Chevy 307 bored out to 350?

Well a 307 has a bore of 3.875 and a stroke of 3.25, so to build a 350 out of a 307 you would need to bore out the 307 .125 inch to a 4 inch bore, which in most cases can not be done, and you would have to put a 350 crank which has a stroke of 3.48 inches and use 350 pistons. But if you want more cubes and power out of your 307 you can bore it .03 over, have it decked .025 inches, and use a 350 crank with 400 rods and 307 pistons to make a ground pounding 333 stroker.


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Will Chevy 307 pistons fit on Chevy 305?

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