[Skip Fix]

Years ago with Lloyd Coulson dynoing his 455 HO about every other pull one of the aluminum Erson rockers would crack!
I've had good luck with the old Norris SS, HS 1.5s and 1.65s and the Crowers-even the 1.8 0.090 offset trunnion BBC on my Pontiacs.

[Skip Fix]

Years ago with Lloyd Coulson dynoing his 455 HO about every other pull one of the aluminum Erson rockers would crack!
I've had good luck with the old Norris SS, HS 1.5s and 1.65s and the Crowers-even the 1.8 0.090 offset trunnion BBC on my Pontiacs.

[Formulajones]

Originally Posted by grivera

Larry - a you post a link to the Ultra Pro Magnums? I can’t find them.

For what ever reason Comp doesn't make them in the Ultra Pro Magnum for Pontiac but they do make the chrome molly Magnum for Pontiac. It's a nice alternative that I'll use when I can't get the Crower, and they are priced reasonable at about $320 a set.

https://www.compcams.com/magnum-roll...-65-ratio.html

[Dragncar]

Originally Posted by Skip Fix

Years ago with Lloyd Coulson dynoing his 455 HO about every other pull one of the aluminum Erson rockers would crack!
I've had good luck with the old Norris SS, HS 1.5s and 1.65s and the Crowers-even the 1.8 0.090 offset trunnion BBC on my Pontiacs.

Interesting, maybe those old Ersons are not all that great. I used to run Erson stuff and I would call their tech guys asking them if they would make the steel pedestal mount rockers for Pontiacs like they had for Chevy's. They said it was in the works, never happened.
I just need a good set of 1.65s for my rocker arm collection and the Ersons will never get run. I got them for free so I thought I would try drilling them out to 7/16".
It does not really work. Very,very hard metal, I had to sharpen each drill in the step process at least 10 times. Even when I finally made it to 7/16 you could not get a 7/16 rocker stud through them. Have to drill past 7/16. With all the coolant, filings that went through them the 2 I did are junk.
Wish I would never had tried it but they were free. Someone could have used them on something like a .500 lift cam with a stud girdle.
I have some Butler aluminum 1.5 rollers, Harland Sharp 1.5 rollers, Norris 1.6 SS rockers, Crower 1.7 aluminum rockers and Crower Endura SS 1.7 Shafts.
Its like I have a Pontiac roller rocker fetish or something.
Guess I am going to have to buy those Comp steel rollers !

[grivera]

Originally Posted by Formulajones

For what ever reason Comp doesn't make them in the Ultra Pro Magnum for Pontiac but they do make the chrome molly Magnum for Pontiac. It's a nice alternative that I'll use when I can't get the Crower, and they are priced reasonable at about $320 a set.

https://www.compcams.com/magnum-roll...-65-ratio.html

Thank you

[Skip Fix]

My IA 500 has Crower SS shafts the rockers look a lot nicer than the aluminum shaft rockers i have seen. although for the E heads I basically had to design to correct exhaust offset to swap on . at least they Even Steven swapped them.
Had to notch the mounting brackets for the studs also.

Here are Comps SS on the 409. not quite as big a trunnion bearing as Crowers.