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Old 10-07-2003, 07:36 PM
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will compression be too low????

im hoping to get about 9-10 to 1 compression with flattop pistons on a 350 chevy bored 30 and use 76cc heads.....or will it be lower???
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Old 10-07-2003, 07:44 PM
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I would guess low 8:1 factory it was probably rated at about 8.2:1 or so with dish pistion but the factory rating was usually overly optomistic.Also keep in mind that most pistons in rebuild kits have a slightly lower deck height because many of their sales are to big engine builders who deck all their blocks. If you get the heads milled that will help raise it.
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Old 10-07-2003, 08:13 PM
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Change the heads or install domed pistons. My 350 , flat top and 62cc chambers is about 9.5-1
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Old 10-07-2003, 08:26 PM
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With proper quench height and milled heads you can get about 9.5:1. You can do the math yourself with this calculator
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Old 10-08-2003, 02:18 AM
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76cc heads on a flat-top 350 gets 8.9 or 9:1 if you use 1.56" height pistons. Shorter "rebuilder" pistons will get you ~8.5.
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Old 10-08-2003, 04:53 AM
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10.7-1

Hey pozz, did you figure the cr, or someone else? Sounds kinda low to me, even with .020 deck height?
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Old 10-08-2003, 07:30 AM
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thanx everyone im gonna try the heads then ....guess i can run pump gas to........thanx all
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