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The breaker gap on my 67 Mustang was off for years
I always set dwell with a feeler gauge, never used a scope. Last month a buddy pulled his Sun machine over and showed me the points were barely opening at 3,000 rpm. Killed my top end and I never knew. Anyone else trust feeler gauges too much over a real meter?
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danielnelson9d ago
Man, you just hit the nail on the head. I ran a 69 Camaro for years and never touched a scope, just set the gap with the feeler gauge and called it done. Then a guy at the track pulled out his old Sun and sure enough, the points were floating like crazy at high rpm. My car would fall flat on its face past 4,500 and I just blamed the carb or the timing. Now I use the dwell meter every single time, it catches stuff the feeler gauge just cant see, especially when the points wear down and the gap changes while the engine runs. Feeler gauges are fine for a baseline but they lie to you once the engine is spinning and the rubbing block wears. Took me way too long to learn that lesson, top end never felt the same after I fixed it.
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