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The compression ratio should be matched to the camshaft duration. The later you close the intake valve the greater the compression ratio can be. With an E cam 9-1 is ok.
I have been grinding a "mod-solex" grind using the solex cam profile on 102 lobe centers. Its a right in between a solex and our "mod-S" grind.
9.5-1 would be fine with the Mod-Solex grind.
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John Dougherty
Dougherty Racing Cams
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