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Old 03-06-2013, 05:14 PM
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piston identification

I have an 1980 era GM crate motor 454 the stamping numbers on piston dome are 3999295 with GM also i am running 118cc heads.. I need help with static compression? Thanks Randy B.

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Old 03-06-2013, 05:34 PM
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A bit under 9-1 depending on factory machining variants.
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Old 03-06-2013, 05:39 PM
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piston id.

this is from the GMPP catalog. 1971 LS-6 std bore 9:1 comp closed chamber pressed in pin i think the head cc's around 106 - 108
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Old 03-06-2013, 06:14 PM
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LS-6? I thought they were 11:1? my LS-5 was 9:1
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Old 03-06-2013, 06:49 PM
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1971 was first year for low compression high-perf BBC
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Old 03-07-2013, 09:30 AM
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update cyl heads are 6272990 118cc open chamber with 3999295 pistons which are supposed to be for a closed chamber head ? any ideas on the compression ratio with this set up? Thanks Randy
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Old 03-07-2013, 04:33 PM
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990 head is similar cc to heads that were originally used with that piston. Hence the 9-1 rating.
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Old 03-07-2013, 05:18 PM
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Quote:
Originally Posted by RB67SS View Post
update cyl heads are 6272990 118cc open chamber with 3999295 pistons which are supposed to be for a closed chamber head ? any ideas on the compression ratio with this set up? Thanks Randy
About 9.3 w/a 0.041" quench distance, 0.030" over 454, 118cc heads and the 14cc domes.
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