10-09-2004, 10:08 PM
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CC Member
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Join Date: May 2001
Location: The Heart of the Citrus District,
NJ
Cobra Make, Engine: Sold 3047 & 3002 in 2012
Posts: 2,763
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Not Ranked
Compression
Cut heads are great for compression.
Dished pistons and valves are not the way to go.
If it were me, and I have had both street compression and 12:1 in a Cobra....
Just go the 12:1.
You will be happy.
For the amount of time you will use the car and the fact that you will have a 42 gal tank, don't even thing about pump gas, not worth the issue.
But if you need..
Pump gas
Iron heads 10:1 or less
Aluminum 10.5:1 max
A lot depends on other build issues such as static compression and other things I can not explain.
But, my engine builder partner can if you need.
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