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Dale- thanks for your input. I believe you are correct about centering rockers over valves - makes no sense not too. Besides in all the info I've read, good contact is the accepted method. I am having pushrod clearance problems on my intake manifold and centering the rockers results in much better clearance. The source I was quoting said I should not be shimming the rockers away from the stand. This would result in less clearance. I am using a 6005 Edel. head fitted to a MR tunnel wedge manifold. This doesn't create a port mismatch problem but does cause a valve center to manifold hole center problem. I will have to do more grinding on the manifold and stay with 5/16" pushrods.
Paul
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