Originally posted by techinspector1
...It has been found that if this distance is minimized to a distance just short of allowing a piston/head collision, that the motor will become more detonation resistant and can be run on lower octane fuels and with more spark lead. A generally respected figure is 0.040"...

... then pick the right thickness of gasket to set the squish at around 0.040". An iron head motor can run as high as 11.0:1 on pump gas with a tight squish.
Tech: You mean LESS spark lead, don't you?

Are you saying that I could get away with a static CR of 9.6:1 on pump gas with iron 64cc Vortec heads for a towing motor if I keep my "squish" between .035 - .040?