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454 - .30 over question ?

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Old May 14, 2007 | 04:47 PM
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From: Lake Arrowhead - Georgia > 72 Base Coupe & 74 BB Roadster
Default 454 - .30 over question ?
I am pretty sure my original 454 pistons had a 4.25 bore. IF I bored the cylinders .30 over....would my new bore be 4.55 ???

If YES....with the stock 4.0 stroke.....what is my new cubic inches using the original 781 (118 cc) heads......????????

I've had c3s since 1970, but never been this deep into one!

Thanks for any info on what I've done....
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Old May 14, 2007 | 04:57 PM
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454, .030 over 460 cu. .060 over 466 cu.
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Old May 14, 2007 | 05:00 PM
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If you bored the cylinders 0.30" over there would be no cylinder walls left.

A "30 over" means 0.030" and your new bore will be 4.28".
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Old May 14, 2007 | 05:22 PM
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From: Lake Arrowhead - Georgia > 72 Base Coupe & 74 BB Roadster
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OK....30 thousands......0.030...

...not .30 which would be hundreths

Thanks,

I kept coming up with 520 cubes and was getting scared!
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