Posted by used red mn on November 15, 2020 at 00:03:05 from (75.73.112.20):
In Reply to: Re: cyl. head #'s posted by Absent Minded Farmer on November 14, 2020 at 17:47:15:
Absent, I don’t know how to say this nicely but your way of thinking towards shaving a head is flawed in two ways. For one milling off the face of the gasket surface does nothing to change the dimensions of the valve seat to the spring seat surface that determines the length of the valves. Secondly the higher compression heads use longer valves not shorter ones. This is because the combustion chamber of a higher compression head is shallower not deeper. So the valves are longer in the higher compression application. Hope this makes sense, it seems hit your head simple to me. The distillate heads have very deep combustion chambers. If you tried to mill enough off of them to come close to the smaller combustion chamber of the gas head, you would probably make the gasket surface to the water jacket distance to thin and it may even break through in places. You may not have enough stud threads and the rocker arm geometry would be way off and there probably would not be enough adjustment for proper valve lash.
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