1987notchback

while i have my accesories off i am curious if the pullies i have are stock or underdrive. does anyone know the measurements of the two? thought i could measure them to see what i have. thanks mike

AdderMk2

pictures would help.

and IIRC, my OEM pulleys were stamped with the Ford logo

1987notchback

i will take a few pics and def check for the logo. i will be down to work on it later this week will check and take some pics then. thanks mike

frdmstng1986GT

I just put underdrives on my car like 3 months ago and I'm about 99% sure my crank and waterpump pullies had a Ford emblem stamped on them somewhere. I got the stock pullies in my shed but I don't feel like walking through 20" of fresh snow to go look right now so maybe ill check tomorrow.

AdderMk2

You're closer than I am.... Mine are in the garage.

The one at my house.... which I am currently not near...


****, Im not even on the same continent!

dreamer1uk

Are these even worth installing? I read conflicting reports regarding charging system issues and its always a pleasure hearing Adders opinion

Milton

I never had a single problem when I had underdrives on my car, but there wasn't much in terms of gains either...

Waste of money in my eyes, especially when I took them off after one season

AdderMk2

i actually have UDP's... I dont have any problems with them, even on my stock charging system, and OEM water pulley/radiator

enix187

an underdrive crank pully will be almost flush with the balancer, stock ones are larger than the balancer. Also the water pump pulley is rather large on a lot of setups not much smaller than the power steering pulley.