would the cracked heads have an effect on compression?
obviously if crack was big enough, but by then I would think you'd have a geyser shooting from the radiator....
are these engines capable of coil bind and bending pushrods from over revving?
it does run on the weak cylinder, it's just that the 120 pound cylinder had least effect on the tachometer when pulling the plug wire...
did not squirt oil into the offending cylinder, I guess that might tell me whether it's piston/rings or valves....
in any case it sounds like low compression isn't a common issue with these engines? thanks for the info so far!