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What is optimal cylinder compression on 1959 harley davidson flh.?

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What is optimal cylinder compression on 1959 harley davidson flh.?

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  1. 120 psi


  2. Boy, I am really dredging the dregs of my memory for this one so double check. I remember being ecstatic when I got 9.5 to one in an old Knuckle (after market pistons and 80" stroker) because stock was about 8. I'm thinking FL's were 8 to 1 and FLH's were 8.5 to 1. The H in FLH was for the higher compression.
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