still fartin with getting all the tidbits on this 302 worked out. refresher, car is 68, motor is 86 5.0 non roller out of f150. obviously i cant use the stock balancer due to the change 28/50oz so...the 86 didnt have a serpentine belt, had a three groove crank pulley, one pulley being smaller and the outter two being larger...but anyway, can i use this pulley since i cant use the OE 3 bolt pulley on the 4 bolt balancer? just get different length belts? or is the size in diamter going to cause something to run less or more rpms than it should? the stock pulley on that was on the old 302 was grooved the same but all were same diameter, same as the diameter of the "inside" pulley on the 5.0 motor....thoughts?