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307 pistons are 3.875" diameter. 305 pistons are 3.736".
It might be possible to bore a 305 large enough to accept the 307 pistons, but the wrist pin location would be .230" off because of the different stroke.
In short, no.
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∙ 12y ago
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Will parts from a 305 motor fit on a 307 motor?
no I respectfully disagree. I am running 305 Chevy TBI heads on my 1971 Chevy 307 and all is very well.
Will Chevy 305 heads fit on a Chevy 307?
Yes they will, but 305 heads have a smaller combustion chamber so it may raise your compression ratio.
Will Chevy 307 heads fit on a Chevy 305?
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yes
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