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aluminum heads you can use up to 11:1
I use cast iron with 11:1 with pump gas and I get away with it.
Javier
 

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would that be to late?? I would like to set the motor up for pump gas
There is software available that can predict the dymamic compression based on your combo........having said that I don't have a link for you......but I am sure a search and/or another member here will have one.
 
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