If I can find a site that lists a replacement crankshaft pulley, it lists a size of 4.25" or something close to that. Some sites don't even list this part for my truck

I measured the pulley on the motor and it is 6.75" diameter, 6 groove. That's all I've ever had on there. Since I can't find that size for my truck, it makes me wonder I have something wrong.


Does anyone know the size of pulley I should have on my crank to drive my accessories?

Also, for a different reason, I am looking for a crank pulley that will fit the same bolt pattern as my current crank but I need it to be somewhere around 6.5-6.75" diameter and use an 8 groove belt. Can find this in 6 groove but not 8.

 

Vortech lists an 8-rib Ford crank pulley in 6.870" diameter.
It is 3/8" greater in circumference and would drive things just a little faster than your 6.750" one.

P/N 4FA018021