Re: [Amc-list] V8 Cylinder Head Questions - Follow up

[Greg Taylor <amundaza@xxxxxxxxx>]

Hi Frank,
  Thanks for the milling feedback.  Also, the compression drop info is very good to know.  I won't be losing (or gaining) that much then.  So the 1970 304 was 9.0:1 compression, then .. I was thinking it was like 10.0:1!
   
  Bulltear posted on IFSJA at ( http://www.ifsja.org/forums/vb/showthread.php?p=710425#post710425 ) that a 0.023" mill would raise compression 0.5 point.
   
  Thanks,
  Greg :)  <><

Frank Swygert <farna@xxxxxxx> wrote:
  I've got a follow-up to!!
Just found this note in PAS -- "Amount of milling required to reduce 
chamber volume 0.16cc - 0.001" (for any chamber size head).

The change on the 304 was from 9.0:1 to 8.4:1, a 0.6:1 compression 
change. Change was 0.5:1 on the 360. So you're looking at roughly a 
half-point change. As long as it stays around 8:1 you will be fine. The 
local machine shop can give you a rule-of-thumb about how much shaving 
it takes to get 0.5 points compression back, I forget!
-------------------------

Date: Thu, 3 Jan 2008 13:45:22 -0800 (PST)
From: Greg Taylor 

*** ADDED FOLLOW UP ***
How much would compression be raised if the 52.2 CC 70-71 304 heads were installed? Just curious. Stock 360 is 58 CC for my 1989 GW. 
       
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