hei with autolites. 2 complete different dist 2 sets of plugwires multiple carbs, compression test, i put air in the cyliders listened for leaks in the exh. several different new sets of plugs. I considered sticking valve guides, zero noise from the valvetrain. The heads were done by a reputable guy, and all the parts were new. However there is still a problem that normal troubleshooting has not solved.My gut instinct says leaking exh valves, but the compression test was good and the vacuum gauge is steady. I think i am gonna drop the exh and air the cylinders up again and listen at the headers. I have a couple hundred miles on it and hasnt gotten worse.
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