Quote:
Originally Posted by 19Fordy
GOESFAST, Thanks so much for taking the time and effort to answer my question. I feel better now, knowing Topline is an excellent replacement.
I don't remember if the original "Johnsons" were flat or did they have a slight crown.
Are the Topline lifters flat or crowned? I do still have an old set of Johnsons lifters that are ground with a slight radius. Is that good, bad or desirable only with certain cams?
Thanks, Jim in FL
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They've always had the "crown" on the lifter face, it helps with two things, first, it helps to keep the lifters "spinning" for a constant oil supply and second, it helps keep the cam running into the unit. Sort of "threading" it into the block!
They also have the a radius on the adjusting nuts as well where they contact the valve stem. This is most likely done to keep the point-of-contact between the stems and the adjusting nuts to a minimum, makes it less important where "alignment" would be an issue??
Thanks, Gary in N.Y.
P.S. On side note almost all cam lobes are ground with a taper to correspond with the lifter radius! Again, this keeps everything "spinning" so to speak! The only lifters (I believe) without a radius were used on the old "Nailheads"?? One of the cam guys up here may know for sure? This photo from Isky's catalog may help understand what's occurring?