Thread: 455 Olds 11:1 -> 10:1
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03-20-2010 04:33 PM #1
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455 Olds 11:1 -> 10:1
Just delivered today a 68-72 455 Olds with 11:1 flat top pistons.
Figuring the 11:1 is based on 72 cc chambers and I add my 77 cc aluminum heads (Edelbrock) what would the compression be (approximate).
If I add .040 thick Cometic head gaskets ( 4.125)
this adds 2.7 cc :
.04 X 4.125 X 16.39 cc/in3 = 2.7
taking the final chambers to 79.7 cc.
Would this allow regular gas with the aluminum heads?
Would the thicker gaskets be required for regular gas
or could I get by without the added expense?Last edited by t0oL; 03-20-2010 at 04:56 PM.
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Damn, that's something I didn't want to hear. I'm glad I got to meet him and Rosie and Rick. I'm proud to have had him as a friend, RIP Johnboy
John Norton aka johnboy