Quote:
Originally Posted by Craig CT
Hello again; I cited the lesser diameter stem and split guides as the known weak points. It's the much wider stem base that will be affected differently by the ramp and will keep the valve open longer
at the top of the lobe than the 8BA valve.
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Actually, no! Valve stem width has nothing to with the cam lobe ramps. It is the bottom of the lifter (Ford called them "pushrods") that contacts the cam lobe. All flathead lifters have the same dimensions, whether mushroom valve stems or not!