The Moroso is 5".

Funny aside about the Moroso pully: I do my best to hide any aluminum and aftermarket mods in my engine compartment. I installed the aluminum pulley out of the package thinking it was buried to where no one would really see it. I went to a local cruise spot and literally the FIRST guy that walks up and looks at the engine points and says "Oh, it looks like you have an underdrive pulley!"

I went home, ripped off the pulley and immediately painted it black! primer


'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.