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Rick- Thanks for your advice. I do not have the larger valves in these Edelbrock heads. They are SCJ valves. Edelbrock however says they moved the intake valve 0.060" away from the center of the bore. This results in more clearance for the intake pushrods and less rubs but the exhaust valves all seem to contact the lower inside edge of the manifold. I am convinced that if my heads had the larger diameter valves (spaced further apart) I would have very little if any problems. The manifold is a high rpm med. riser tunnel wedge which no doubt was cast for the med riser 427 heads with the larger valves. I will proceed to do my clearancing to the manifold. Thanks again.
Paul
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