the service manual states that the TDC on the crankshaft is marked by a white mark on my 92 LS. i see two on mine. i bought the car used so i don't know what happened. anyway, i see a set of 3 groves on the crankshaft pully and another grove about 1/2 a inch away. the center grove of the set in 3 is white and the grove further away is also white. my question is which one is the TDC?
thanks