Holroyd BBC Rocker Arms
 

Are these the rocker arms that the Holroyd system uses?

http://cgi.ebay.com/ebaymotors/GEN-V...Q5fAccessories


Does anyone know how much his system costs? Can you buy just the 9/16ths studs and ball adjusters?


Thanks
Manny

Re: Holroyd BBC Rocker Arms
 

Yes but they are modified, you just cant use them like that.

Re: Holroyd BBC Rocker Arms
 

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.

Re: Holroyd BBC Rocker Arms
 

I think you should call Clark.

Once you talk to him, you will realize that it is cheaper to have him make the stuff.

He has a good set up.

Re: Holroyd BBC Rocker Arms
 

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.

Re: Holroyd BBC Rocker Arms
 

What Holroyd sell for bigblock it works money well spent

Re: Holroyd BBC Rocker Arms
 

agreed. You can't do the mods to the rockers for what he charges.

Re: Holroyd BBC Rocker Arms
 

The rockers Clark uses are Marine, identified by a particular marking inside the rocker. He has machined a re-inforcement that fits above the pushrod seat and is welded into place. The design is a nice fit, with an oiling hole that aligns with the hole in the rocker. I doubt you could do these yourself for the money, unless you could design them and had a cnc machine capable of making the inserts and did not count your time. I just got mine back from being upgraded, Clark is great to do business with and IMO his stuff is top notch. The Stud and adjusters he makes to use with these rockers are beautiful, sure they cost $$ but for a limited specialty product worth it....they are also legal as purchased from Clark.....
my 2 cents...
Grant Eldridge

Re: Holroyd BBC Rocker Arms
 

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.

Re: Holroyd BBC Rocker Arms
 

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

Re: Holroyd BBC Rocker Arms
 

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

Re: Holroyd BBC Rocker Arms
 

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.

Re: Holroyd BBC Rocker Arms
 

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?

Re: Holroyd BBC Rocker Arms
 

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

Re: Holroyd BBC Rocker Arms
 

I think the real question is this:
"I want to take your years of R&D, failed product testing & successful product testing. I want to copy the successful program and not allow any compensation for the inventor so I can save some money. Please send pictures and accurate diagrams where necessary. And then when I have it working, I can market the same system and undercut the competition. "

Just like the Chinese! :mad:

Re: Holroyd BBC Rocker Arms
 

Jeff that is funny, but I'm not about that. If u r talking chocolate chip cookie recipes then that is another story

Re: Holroyd BBC Rocker Arms
 

Not kidding Plugra butter and Callebaut dark chocolate are the key ingredients. Make them golf ball sized at a min and pat them down a little to flatten them and they'll come out about 4 inches round. Cook at 375 degrees for 10 mins max. After 10 mins, you'll then have to put the whole tray into the refrig or freezer for 30 mins. They'll be too gooey if you pull them out of the oven and try to pull them off of the cookie sheet.

These particular cookies were a recipe of an old GF, that the Boston Globe/Herald had a write up on. She wasn't happy about me spreading the recipe news to anyone, but you know what they say next:)

These are high end Cchip cookies, so no jokers that think the store bought crap cookies are good.

You have to follow the recipe and you MUST cool them (frig/freezer) for 30-45 mins or you'll have a mess on hand.

Adios now someone please send me a pic of Holroyd's rocker arm setup

Re: Holroyd BBC Rocker Arms
 

[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

Re: Holroyd BBC Rocker Arms
 

Thanks everyone. Talked to Clark about the RArms

Re: Holroyd BBC Rocker Arms
 

[QUOTE=Mark Yacavone;253760]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

Re: Holroyd BBC Rocker Arms
 

If NHRA hadnt allowed the crazy valve spring pressures years ago stockers woulnt have to use this crap. its just costing you more money.

Re: Holroyd BBC Rocker Arms
 

[QUOTE=Mark Yacavone;253760]Mark, who knows? All I know is that there are many things out there that are in now and no one knows why.....:)

Re: Holroyd BBC Rocker Arms
 

Terry, No one knows that more than me and I hate that it has come to this. All my stump pullers still use 130 seat and 330 open, the extra rpm these spring pressures allow are no advantage to me. On the other hand if I don't play by the new rediculous rules the L88 would be left way behind.--------Danny

Re: Holroyd BBC Rocker Arms
 

Those $279 Crane Gold rockers for Stock don't sound so bad against a $900 set of stamped rockers now do they? :D

Re: Holroyd BBC Rocker Arms
 

racear I said dark chocolate not laxative chocolate:)

Re: Holroyd BBC Rocker Arms
 

The rule book says rocker arms can not be modified. I asked Wesley if I could modify mine so they wouldn't split and he said "no".

Re: Holroyd BBC Rocker Arms
 

Hummmmmm, Interesting.

Re: Holroyd BBC Rocker Arms
 

It sounds like the difference between the west coast rule book and the east coast rule book. Is it legal to do this or not ? Travis????????

Re: Holroyd BBC Rocker Arms
 

Yes TECH MAN... this is a load of crap... no aftermarket rocker arms...what does that mean?

Re: Holroyd BBC Rocker Arms
 

Bub,Terry just has to bit#h about something NHRA did. He has nothing better to do with his time.

Re: Holroyd BBC Rocker Arms
 

I was just trying to find out for sure if they were legal before I spend a bunch of money on something that would get me thrown out sometime on the east coast. Wouldnt you guys all have a good laugh at my expense if that was to happen....LOL This dumb azzed x tech man dosent even know whats legal or not !! Its been 10 years or more since I had to deal with any of it but after reading this thread what is someone to believe?

Re: Holroyd BBC Rocker Arms
 

Does this also mean you can't open the slot up to accept larger studs?

Re: Holroyd BBC Rocker Arms
 

Travis cant answer he is caught in the middle. The 502 rockers are not something new, they have been around for at least 5 years. You cant get the old long slots anymore, people have been refining the slots for years too. Cleaning the slot also cuts down on the breakage and cleaning the oil hole dose too. Clark's rockers address those problems and have been thru tech many times on diff engines both 396 & 427, Arnold Greene also has the same setup.

Re: Holroyd BBC Rocker Arms
 

This is beginning to sound like IHRA has the better idea and cheaper to.

Re: Holroyd BBC Rocker Arms
 

Someone asked, so here's a photo of Clark's rocker. The cross inside identifies the marine 502 rocker, the insert is shown separately to one side....Sorry, I don't have a photo of the special high strength stud and adjuster that are used with the rocker arms. I went to these after noticing that the stock sized ARP studs used with the Crane rockers I had been using were bending as I turned the motor over due to the high spring pressures we were using......
Grant Eldridge

Re: Holroyd BBC Rocker Arms
 

I take it that insert fits under the welds on the push rod side of the rocker arm?
That's a bunch of bull crap that this is legal. Not only is the part heavily modified, it doesn't even look stock when it's all done. I believe the rule book is clear on this issue. Either the rule book needs to be amended to reflect allowable modifications or the rule needs to be enforced.
I've long known about this 502 rocker swap but was not aware the rockers were welded and support bridges attached. Had this type of modification been specifically accepted in the rule book, I would have kept my car in D/S for it was the constant rocker issues that wore me out while at the races. The allowance of a T&D shaft rocker in SS is what pushed me over from Stock to SS. Sure makes it a lot easier to maintain valve train integrity.

Somebody should pull up the thread I started on Stock Eliminator roller rockers (it's been so long, maybe 5 years that I doubt it's even archived here). But the gist of it was that with all the other items allowed (Schubecks, tool steel lifters, billet cam cores, fat pushrods, 9/16" 502 marine, tool steel and premium after market cast rockers, etc.) it no longer made sense to run a stamped steel OEM rocker. Boy, was I chastised as yet another placing nails in the coffin of Stock! I also heard how I didn't know how to correctly fix the problem with proper geometry or cam profiles. Obviously, my pain of yesteryear is felt by many as there is a burgeoning industry that is allowed by NHRA despite how the rulebook is written.
As I was told, if you can't make your engine live under the guides of the rulebook, get out! I did, and the financial outlay has been huge. Seeing these "allowable" rockers makes me second guess my decision to get out of Stock as I know with what I know now, 10 thirties is not out of the question in D/S for me.
My long standing opinion is OEM configured or mounted roller rockers should be allowed in NHRA as is IHRA. That means Crane or similar brand stud or shaft mounted (replicate OEM mounting) aluminum roller rockers that generally speaking sell for about $279.00. I fail to understand the logic that this should not be permissible.

Re: Holroyd BBC Rocker Arms
 

I'll give my 2cents I know I will probaly regret it.
If the rules are stock rockers then I think they should be unmodified that you can see by eye.

If aftermarket was allowed then I say shaft rockers should be allowed,that way all brands should be on level playing field then, for example if it was stud mounted rule,dodges,buicks,fe's can't run studs,so then you have people fussing why can't I run shaft rockers like that dodge,buick or fe.

I think that would be fair to everyone,there are combo's that are at a disadvantage because of rockers now whether it is weaker design,non adjustable,yeah I know you can use adjustable pushrods,but that is real pain in the rear.

Personally I would like to see things stop changing.when was it 1986-1987when,cam/spring rule changed?


I like change, especially when they change it back to the way I liked it to start with.LOL
Mike Taylor 3601

Re: Holroyd BBC Rocker Arms
 

I would say that the NHRA tech dept. should take a closer look at what is being used and done in relationship of the current worded rule book. THAT was the point I wanted to know about before I was blasted in an earlier thread by a couple of guys. Although its probably no worse than all the cheated up head, intakes and lite assemblys being used today. S/S is looking a lot better.

Re: Holroyd BBC Rocker Arms
 

They are legal for engines other than big block Chevy’s and have been for quite a while. And they don’t break just because of spring pressure; opening ramp is the predominant reason in my opinion.

Re: Holroyd BBC Rocker Arms
 

Why do you think it takes spring pressure?
We have to have higher spring pressures because of aggressive ramps that were put to use when spring rule was opened up.
I'm sure that when spring rule was changed it was not dreamed that spring pressures used now would ever be used on flat tappet lobes.
If spring/cam rules had not been changed there would be no use for the special lifters,modified rockers etc.
Mike Taylor 3601