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rule of thumb here anything under 400 ci adds 5 cubic inch per .03 over bore. at 400 and over cubic inch, every .03 overbore adds 6 cubic inch.
heres a formula
bore X bore X stroke X number of cylinders x .7854 = cubic inch
427 chevy
4.25 bore
3.76 stroke
=426.72 CI
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∙ 11y ago
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