Timing Marks
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Senior User
Joined: Jun 2003
Posts: 352
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From: Tillamook, Ore
Timing Marks
OK, I feel pretty stupid asking this one but where exactly am I supposed to line up my 10 btdc mark on the timing tab. Mine is shaped like a half moon with a notch right in the center and somewhat of a point at the top and a sort of spyhole at the bottom. It's a 1990 F250 5.8 E40D 4x4. Seemed to run best toward the top of the tab so that's where it's at now, but I just wanted to make sure on this base timing.
