ArKay99

iTrader: (1)

I have a 99 corvette. I'm doing a head/cam swap in a week or so and bought an ASP ud pulley and a double roller timing chain. I've heard the us y-body guys have to trim the pulley to mate with the seal/oil pump. Does anyone know exactly what I have to do? I thought all I had to do was mill .125" off the back of the pulley. Then I heard I need to turn the collar in .125". Can someone steer me in the right direction?

PREDATOR-Z

That was on the old pulley not the NEW redesigned one.

felton316

You must increase the value of A (in the picture) by 3mm. If you have one of the newer ASP pullies, you may not need to machine at all.

PREDATOR-Z

That's what I said

ls1290

iTrader: (20)

How does the machining affect the balance of the pullie since it is internally balanced?

ArKay99

iTrader: (1)

Thanks! That is what I needed. I assume the new pullies look like the picture. Mine does not. The narrower part of the collar is about 1/2 the width as the one in the picture. Gotta go down to the local machine shop.

kickassT/A

iTrader: (3)

i dunno where you're located, but asp is in houston, right down the street from MTI. they do it for like $20 if i remember right.

ArKay99

iTrader: (1)

Thanks man. I live in New Joisey. Too far, but there is a local shop I can use.

slick98ta

Here's a pic I found awhile back that someone took of the old style and one thats machined.