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Dynamic vs effective compression
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SMOKEmUP
PostMaster


Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Tue Nov 22, 2005 2:20 pm    Post subject: Reply with quote

The 305 heads are cast iron correct? If so 10.7:1 with iron heads most probably won't work on 91 octane gas. Don't get me wrong this can be done but everything needs to be right on to make it work.
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rogus
Member


Joined: 07 Aug 2005
Posts: 61

2232.14 points


1976 Chevrolet Chevelle

PostPosted: Mon Nov 28, 2005 12:28 am    Post subject: Reply with quote

smokemup wrote:
Switching from 76cc to 58cc chamber will jump about 2 points in compression ratio. What compression ratio do you have now?


BTW... Here is the info I have on the 882 heads.
Code:
 
GM 882                     
Cast-Iron                   
                       
Chamber Size     76cc       
Intake Runner     151cc     

Lift            Int     Exh   I/E ratio           
 0.100       70   58   82.9
 0.200       125   108   86.4
 0.300       175   135   77.1
 0.400       204   141   69.1
 0.500       205   142   69.3
 0.600       206   142   68.9


Smoke - do you happen to have these stats on the more rare 881 heads - they were the 76 cc but with the 2.02/1.6 valves?
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