Originally Posted by wrench459
Lets see If I got this right
1.5 head stock on a 93 mm block (dished pistons)
rough and I mean rough compression guess would be around a little under 11:1
You might in my opinion might what to retard the cam timing to lower the pressures down to keep from detonation or a special cam to take advantage
of the higher ratios.
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I'd have to go back and re-calculate... but I don't believe a 1.5 head (un-milled) on dished 7:6 to 1 pistons would yield 11:1. I think its closer to the 8.5 - 9 :1 range...