How to mod an ASP pulley for a double roller timing chain?

Reply Subscribe

Thread Tools

Search this Thread

Aug 17, 2004 | 10:43 AM

ArKay99

Thread Starter

TECH Regular

iTrader: (1)

Joined: Nov 2003

Posts: 490

Likes: 0

From: Washington Township, NJ

How to mod an ASP pulley for a double roller timing chain?

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?

Aug 17, 2004 | 11:03 AM

PREDATOR-Z

TECH Senior Member

Joined: Mar 2004

Posts: 14,620

Likes: 17

From: BFE

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

Aug 17, 2004 | 11:09 AM

felton316

TECH Addict

Joined: Nov 2001

Posts: 2,593

Likes: 0

From: TEXAS

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.

Attached Thumbnails

How to mod an ASP pulley for a double roller timing chain?-aspls1tech.jpg

Aug 17, 2004 | 11:11 AM

PREDATOR-Z

TECH Senior Member

Joined: Mar 2004

Posts: 14,620

Likes: 17

From: BFE

Quote:

Originally Posted by 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.

That's what I said

Aug 17, 2004 | 12:42 PM

ls1290

Dumb Ass Vette Moderator

iTrader: (20)

Joined: Jun 2002

Posts: 4,281

Likes: 2

From: Colorado

Quote:

Originally Posted by 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.

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

Aug 17, 2004 | 01:21 PM

ArKay99

Thread Starter

TECH Regular

iTrader: (1)

Joined: Nov 2003

Posts: 490

Likes: 0

From: Washington Township, NJ

Quote:

Originally Posted by 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.

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.