Holroyd BBC Rocker Arms

[Mark Yacavone]

Originally Posted by mannymen

Does anyone have pics on what has been modified or what specifically needs to be modified? Figured if it is something that I can do then l'll save myself the money and do it myself. Not paying someone for simple mods anymore.

Oh no you don't . You can't weld your own rockers, but you CAN pay someone else to do it, apparently.
Maybe there IS a West Coast rule book after all.

[james schaechter]

Originally Posted by Mark Yacavone

Oh no you don't . You can't weld your own rockers, but you CAN pay someone else to do it, apparently.
Maybe there IS a West Coast rule book after all.

Mark, there were some guys welding up the pushrod sides of their rockers and no one in tech had issues with that. The rocker had to stand a lot of heat in that process. The problem seemed to be that if the rocker got too brittle, it would break anyway.

Clark cuts out a section and welds a solid piece in place. I know he asked tech if it was ok and they said it was. I don't think that eliminates someone from doing the same on their own. It would be a difficult chore unless you had the equipment and time.

[mannymen]

Is the weak link the 7/16ths stud or the rocker arm?

[Bob Pagano]

Both, you need to spend a few extra bucks, at least you will know its right. Not an area for guess work.

[Greg Reimer 7376]

That stuff on Ebay was a bunch of used parts. If you want a bunch of used crap in your race car, you wind up with nothing but used crap. Do it right the first time, get the right NEW parts from Clark, be it a Quadrajet, a Holley, or a set of valve train parts, and be done with it because its done right the first time.

[mannymen]

Thanks guys for your responses. I just wanted to know what was special. Has anyone tried the 502 Marine rocker arms the way they are and with the 7/16ths studs?

Who has pics of the Holroyd setup?

[Bob Pagano]

Unless you do the mods right they will still break and or push the pushrod thru the rocker.
I would also send them to Jim Bailey at Finished, 330 858 1842
Clark's # 909 483 0311 cell 909 591 4320

[Mark Yacavone]

[QUOTE=james schaechter;253389]Mark, there were some guys welding up the pushrod sides of their rockers and no one in tech had issues with that. The rocker had to stand a lot of heat in that process. The problem seemed to be that if the rocker got too brittle, it would break anyway.

Jim, I was just wondering when it became legal to weld or customize stock rockers??
When we went to Indy in '04 with the 350 Buick, I had already split a couple of rockers at the shaft hole. I wonder how long we would have lasted in teardown if I had welded a bridge piece across the top of my rockers to strengthen them up?

Let's do a poll:

5 seconds

10 seconds

15 seconds

[mannymen]

Thanks everyone. Talked to Clark about the RArms

[Dan Lattimore]

[QUOTE=Mark Yacavone;253760]

Originally Posted by james schaechter

Mark, there were some guys welding up the pushrod sides of their rockers and no one in tech had issues with that. The rocker had to stand a lot of heat in that process. The problem seemed to be that if the rocker got too brittle, it would break anyway.

Jim, I was just wondering when it became legal to weld or customize stock rockers??
When we went to Indy in '04 with the 350 Buick, I had already split a couple of rockers at the shaft hole. I wonder how long we would have lasted in teardown if I had welded a bridge piece across the top of my rockers to strengthen them up?

Let's do a poll:

5 seconds

10 seconds

15 seconds

Mark, The answer is 5 seconds. Don't know why they're allowed but as long as they are we're using them. They are THE fix for the pushrod thru the rocker problem. Two sets on two motors and no failier for two seasons. Well made and worth the price especially considering what it costs to do these motors.--------Danny