Quote:
Originally Posted by Paul Precht
I thought there was a + or - .005" tolerance on valves unless the rule was changed, Paul.
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Last time I looked the rule was + .001/ - .005. This rule came about due to the 426 Hemis having a problem with the valves clipping each other in S/S with the high lift cams. Dave Wren was bounced at Gainesville when I worked for NHRA in 1974 because of this. His valves were several thou undesized for clearance.