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I have a set of the new Comp AMC roller lifters for one of my next projects, the cups are quiet a bit higher than the Comp Mopars, maybe you should have them send you one to try on the problem motor Is the exhaust pushrods rubbing hard on a aluminum block?

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Thanks Cab and everyone for the help.Sam at Indy has a cam with the correct base circle and AMC lifters on the way.Moparts is great,thanks again all.