I just got started putting my harmonic balancer on my 98 ls1. I got the old one off and I saw that the old one doesn't have a key way or timing numbers on it, but my new slp one has both a key way and timing numbers. So I am just wondering if I need to put the new one on any certain way or not. If so how do I figure it out. Thanks so much Kyle

 

Just ignore keyway and timing #'s these are mainly for high boost engines.
Follow instructons ie use old bolt to get as far up as possible then turn new bolt 140*IF YOU CAN mark the pulley at 45*s so you know how far. I got mine to about 120* with a 6ft pole on it.
If A4 you need to jam a large screwdiver in the flywheel on the drivers side behind oil filter and plastic cover. Hope this helps