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It was fine all last year and before I changed the rotor plus I'm not yet skilled enough to do cam timing. Valves were loose when at compression TDC. Can they still be out of spec ?
I'm a bit puzzled about the polarity and timing advance and how it still has performed without problems untill now?
If the tighter plug gaps and disributor coil checking do not bring any light to this problem I'm going to check the valve clearance again. Maybe the 'snug' 0.004 was too snug and the valves are too tight when it gets hot? Would't that cause intake backfire though?
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