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Gotcha, I was thinking you made the slot at a 4 degree angle. I wasn’t thinking 4 degrees of crank rotation. My head came outta muh buttwrong thread fred. lol
if I get a gain with 4 deg, I will grind 2 deg in the cylinder. if I get a loss, I can back up 4 deg. I will then be 2 deg more then where I started. keep in mind I do this in duration not after top dead center.