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Old 06-09-2005, 12:01 PM
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think 10.25:1 CR is to much ? or will it be that high cause, if 454C10 is right The head gasket adds 8cc and the piston in the hole adds about 4cc = 12cc + 76cc = 88cc heads. or is the 10.25:1 piston have the extra 12cc figured in ?


Northern Auto Parts said,

Yes, we can substitute pistons on these kits to roughly achieve a
compression ratio of 10.25:1. In order to accomplish this, you would
need a piston with a .275 dome (H617CP). The upgrade on the street
performance kit would be $106.40 for a total of $566.39.

However, there is one note of caution in using this configuration. Compression ratios in excess of 9.5:1 are NOT recommended for use on pump fuel unless you are running aluminum heads. The extra 5 horsepower you may achieve may not worth be the trade off of $5 per gallon race fuel. If you have any more questions, feel free to call us at

-----Original Message-----

Mustangsaly Asked:

i was looking at this kit, Chevy 350 (to 1985) STREET PERFORMANCE -
HP350KHW Hypereutectic Pistons with Scat Crank.
1497 Hypereutectic pistons... can substitutions be made on pistons ?
pistons i need are .30 over, and i'm wanting around 10.1.1 to 10.5.1 CR
Hypereutectic Pistons with 76cc heads, a i haven't picked a cam yet, .......
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