BQR280Z Posted April 26, 2005 Share Posted April 26, 2005 I tore down the Z on Sunday and found my NOS damage. After the last NOS run last season, I figured I burned an exhaust valve (badly). Compression in #3 was 55, compared to 180 in the rest, and the hiss was all through the tailpipe. #3 exhaust valve is gone, a section about 3/8" wide and 1/4" deep is gone from the seat face. The seat in the head is hurt too. New head is almost ready, ported, new 290/495 cam, hi-po springs. Bill Quote Link to comment Share on other sites More sharing options...
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