I found a 7.5 inch 4 groove crank pulley but the 6.9 inch water pump pulley will not fit, just barely. The 6.4 inch would fit. Why is it that you cannot find an overdrive set of pulleys? Makes no sense.
The 7.5 crank pulley with a 6.4 inch water pump pulley would be 15% over and that would be smoking if you can get the crank pulley. Who has that pulley??? I’d just machined off the unneeded grooves.
You can’t hardly buy overdrive pulleys because it became the trendy thing to underdrive the water pump to save 3 horsepower, which of course costs 20 or more horsepower because the engine temp can’t be controlled.
Sometimes a horsepower gain on the dyno is an power killer in the car.
