Took my 6X heads to very reputable engine machine shop / builder last weekend. Had him check the heads over and flow test a intake port, then had him test the valve springs. They all read very low at install height (1.700"), about 70-80 !
Thinking that may have been a contributor to the wear issue. Evidence included beat up spring shims, valve end burrs, and a couple of seats in the heads needing a touchup. I have read about many problems which arise from worn / incorrect springs.
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