When fitting a blower on the Harmonic damper is done away with but then you have no timing mark, I had marked the alternator pulley but while everything was stripped out I decided to make up a pulley to take a timing tape. The original balancer was 8" diameter but I didn't have any aluminium that size, nearest thing I could find was an old wheel spacer that was 6.5" diameter, this was deemed just large enough to suit a MSD 6.375" timing tape, first thing was to turn the diameter to 6.375" and then bore the centre out to 3.480 to sit over the blower hub nicely, holes were then drilled and tapped in the alternator pulley for it to bolt too, then the excess aluminium was turned off. Then the new pulley was bolted on with 5 x 1/4" UNC ARP stainless bolts Once the blower pulley is back on it sits about 5 thou off the small bolts which makes it impossible for them to come out. This is the sheet of Timing tapes, they are self adhesieve, once we reset TDC it will be stuck in place. .