Posted By: Hemi Allstate
Comp Pro Magnum rockers ? - 05/10/10 07:48 PM
I have read about these rockers being a problem with bigger cams and higher spring pressures. Is anyone using them with a milder hydraulic or solid lifter FT cam?
The cam I am going to use is a Comp Cams XE284.
I have these mocked up and ready to use, but I am having concerns. I really don't want to spend the bucks to have them bushed if I don't have to.
Thanks,
Mark
Posted By: AndyF
Re: Comp Pro Magnum rockers ? - 05/10/10 07:50 PM
They should be fine with a flat tappet cam. The new rocker arms from Comp are bushed so evidently the engineers decided to make the switch.
Posted By: Thumperdart
Re: Comp Pro Magnum rockers ? - 05/10/10 07:50 PM
I ran em for 5+ years w/a solid cam and had zero issues and as far as I know, they`re still going strong.
Posted By: Thumperdart
Re: Comp Pro Magnum rockers ? - 05/10/10 08:31 PM
The cam was a solid Isky w/.590-.605 lift and the dur. was somewhere around 260 @.050 I think.
Posted By: Badfish67
Re: Comp Pro Magnum rockers ? - 05/10/10 09:19 PM
Let me tell you about my issues with the Pro Magnum rockers.
I had them on my small block with a .670 lift solid roller cam and 260ish seat pressure. The rockers galled the shafts and from that I bent a few valves. The rockers suck and i'll never use them even on a street engine.
I know ya'll going to say that I should not have used them with my cam and springs, but Comp and Indy said I would be fine.
Now the engine is at RyanJ's shop and I cant wait to get it back!!!
Posted By: S/ST 3040
Re: Comp Pro Magnum rockers ? - 05/10/10 09:44 PM
I ran the Comp SB rockers 125 passes. Rotella-T 15W-40,
Shubeck lifters and 440+ lbs. open pressure.
They looked better than I expected.
Posted By: ZIPPY
Re: Comp Pro Magnum rockers ? - 05/10/10 09:46 PM
You won't have any problems with them if everything is set up correctly. It should be fine.
I haven't any issues with them at 500lbs open pressure without any bushings or honing.
Use/create Comp's recommended .030" side clearance, use a liquid assembly lube or oil (not thick paste), and whatever
you do...don't overtorque the shafts.
Posted By: ademon
Re: Comp Pro Magnum rockers ? - 05/10/10 09:49 PM
You ran $450 rockers with a 670 lift solid roller? they work fine for street type stuff
Posted By: Hemi Allstate
Re: Comp Pro Magnum rockers ? - 05/10/10 10:14 PM
I haven't any issues with them at 500lbs open pressure without any bushings or honing.
Use/create Comp's recommended .030" side clearance, use a liquid assembly lube or oil (not thick paste), and whatever
you do...don't overtorque the shafts.
Sounds like I have it right except that I used Lubriplate assembly lube on the shafts? Is that a problem?
Thanks,
Mark
Posted By: RyanJ
Re: Comp Pro Magnum rockers ? - 05/10/10 10:26 PM
They work great until you get over 500 lbs of spring pressure... more pressure, the quicker they will gall.
Have had a bunch of customers not listen to me & end up galling their Pro Mags on Solid Rollers. Nice to know Comp is now bushing them...
PRW Chrome Molys are an almost exact copy of the Pro Mags, & have a thick bronze bushing in them... Alot less $, more choices of rocker ratios...(Pro Mags only 1.5) only problem is the adjusters are brittle. I just went over 8000 miles this morning on my PRW's on my 440, mild street solid roller, 190 seat, 550 open. I put T&D adjusters in them... been great rockers other than the adjuster issue.
Posted By: Torred
Re: Comp Pro Magnum rockers ? - 05/14/10 12:42 AM
I use the Comp Pro Magnum Rockers on a 440 with
COMP Cams XE 284 cam
COMP Cams P/N #911-16 Single Outer Valve Spring; 1.524" (with Damper)
COMP Cams P/N #867-16 Pro Magnum Hydraulic Lifters
Going on 5 years Street/Strip no problems, no complaints but I believe that the springs are considered marginal for my application.
Posted By: AutoEngineer
Re: Comp Pro Magnum rockers ? - 05/14/10 05:40 PM
How do they feed oil to the pushrod cup and adjuster ball?
Is there an oil passage through the rocker body?
