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-   -   will compression be too low???? (http://www.hotrodders.com/forum/will-compression-too-low-25239.html)

joe28boxer 10-07-2003 07:36 PM

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???

Robinson Robin 10-07-2003 07:44 PM

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.

pozz33 10-07-2003 08:13 PM

Change the heads or install domed pistons. My 350 , flat top and 62cc chambers is about 9.5-1

RedRocket 10-07-2003 08:26 PM

With proper quench height and milled heads you can get about 9.5:1. You can do the math yourself with this calculator

jimfulco 10-08-2003 02:18 AM

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.

Wrencher 10-08-2003 04:53 AM

10.7-1
 
Hey pozz, did you figure the cr, or someone else? Sounds kinda low to me, even with .020 deck height?

joe28boxer 10-08-2003 07:30 AM

thanx everyone im gonna try the heads then ....guess i can run pump gas to........thanx all


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