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Makes it a 350. 330's and 350's were the same small block with different bore. 330's will take a 0.060" overbore safely and can usually be bored to accept 0.060" over 350 pistons (for a total 0.120-0.125" overbore) if desired. It is safer to stick to a 0.060" overbore, to allow fitment of standard bore 350 pistons, however.

The rule of thumb when it calls for overbores is 5 CI per .030 bore in a small block and 6 CI on 400 CI and above

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11y ago

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