Rocker clearance w/ Pro topline heads....

Reply Subscribe

Thread Tools

Search this Thread

Aug 11, 2003 | 12:29 PM

Free Bird

Thread Starter

Supreme Member

iTrader: (1)

Joined: Jun 2001

Posts: 1,668

Likes: 0

From: Dale City, VA

Car: 91 GTA and 85 IROC

Engine: 355

Transmission: gear jammer

Axle/Gears: 4.11

Rocker clearance w/ Pro topline heads....

I'm having interferance problems w/ my LT4 rockers and the bigger springs. Will I have the same problem w/ the Pro magnum rockers? The rocker arm body is hitting the retainer.

Thanks.

Aug 11, 2003 | 12:36 PM

F-BIRD'88

Supreme Member

Joined: Sep 2001

Posts: 6,111

Likes: 53

From: Ontario, Canada

Car: 1988 Firebird S/E

Engine: 406Ci Vortec SBC

Transmission: TH-350/3500stall

Axle/Gears: 7.5" Auburn 4.10 Posi-Traction

GM Lt4 rockers have limited lift travel clearance. They are also made for the small diameter valve springs.

You may have a problem with rocker geometry. Different length pushrods may be nessessary.

Comps Pro magnum rocker should clear the larger retainer better.

Aug 11, 2003 | 01:40 PM

rjmcgee

Senior Member

Joined: Dec 2001

Posts: 976

Likes: 1

From: Klamath Falls Or 97603

Quote:

Originally posted by F-BIRD'88
GM Lt4 rockers have limited lift travel clearance. They are also made for the small diameter valve springs.

You may have a problem with rocker geometry. Different length pushrods may be nessessary.

Comps Pro magnum rocker should clear the larger retainer better.

I am running a set of Comp roller tips and they cleared fine. You will probably want to purchase an ajustable pushrod to take the guess work out of the geometry.