CK5
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what is the size of a 350 bore

4.000 is standard bore, as it came from the factory.
With each rebuild, they may bore it over. You hear 30 over, etc. They mean 30 thousandths, for a total bore of 4.030" (or 10 over is 4.010").
You can go up to 4.060 or 60 over.
-- Mike
 

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