[Tom Wells]

Hello Tim,

Finally got around to measuring my pulley sizes. They are stock F250 460 steel pulleys, but obtained from dealers, so I don't know if they are a legitimate factory pair or not.

They are: crank -> 6-3/4" OD and water pump -> 5-3/4 OD.

The ODs are outside of flenge to outside of flange, and these are serpentine belt pulleys, NOT v-belts.

Also, since the pulleys are hard to see & reach, the diameters may not be accurate but to a 16th or so...

This does indicate the pump is overdriven (faster than crankshaft speed). The pump itself is a Ford Racing aluminum pump, same as comes on the crate motors of a few years ago.

I use a Griffin aluminum radiator and the car always runs in the 90-100C range. It can and has idled for 30 minutes without moving, and cools off to below 100C immediately after it starts moving. Never an overheating problem even when the thermometer stays above 90F.

Hope this helps,

Tom