TDC Location on Crank Pulley

[Hugh Fader <hfader@usa.net>]

I have seen statments like "If you trust your TDC mark" on the lists. So, I
checked TDC on my crank pulley and discovered that it occurs when the
pointer is at 2 BTDC. I also see a slot cut into the mark at 4 deg ATDC. I
have a new crank. I assume that someone, maybe the factory, calibrated the
pulley to the old crank at 4 deg ATDC and that is what the slot is for.

Anyone have insights on this?

- Hugh