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Problems with Comp Pro Magnum Rockers? #1214719 04/12/12 11:04 AM 04/12/12 11:04 AM
Joined: Jan 2003 Posts: 971 Mooresville, NC A70Runner OP super stock
A70Runner OP super stock Joined: Jan 2003 Posts: 971 Mooresville, NC	I finally got my 496 onto the dyno. Break in went great! sounded good no leaks(other than junk valve covers) all ok...Go to do first pull on engine. Its making good power for a first pull and all of a sudden we hear a noise and power dropped off. Pulled the valve covers off and found 3 rockers seized to the shaft. Also bent three valves. Great.... I am now hearing that Comp changed the design of these rockers? I bought these in 2006. Is there a better rocker to use? The car has a solid roller in it. Going to be a street/strip car. Thanks in Advance, I'm going to call comp and see what they say... 7161768-rocker.jpg (101 downloads) Last edited by A70Runner; 04/12/12 11:05 AM. "People Think I'm Insane Because I Am Frowning All The Time" Black Sabbath

Re: Problems with Comp Pro Magnum Rockers? [Re: A70Runner] #1214720 04/12/12 11:08 AM 04/12/12 11:08 AM
Joined: Jan 2003 Posts: 75,020 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,020 U.S.S.A.	What spring pressures are you running ?

Re: Problems with Comp Pro Magnum Rockers? [Re: JohnRR] #1214721 04/12/12 11:16 AM 04/12/12 11:16 AM
Joined: Jan 2003 Posts: 971 Mooresville, NC A70Runner OP super stock
A70Runner OP super stock Joined: Jan 2003 Posts: 971 Mooresville, NC	275 seat 650 open "People Think I'm Insane Because I Am Frowning All The Time" Black Sabbath

Re: Problems with Comp Pro Magnum Rockers? [Re: A70Runner] #1214722 04/12/12 11:22 AM 04/12/12 11:22 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Those must have been snug on the shaft to seize on the first pull... TD rockers are much better BUT they do cost more.... sorry you broke it

Re: Problems with Comp Pro Magnum Rockers? [Re: A70Runner] #1214723 04/12/12 11:26 AM 04/12/12 11:26 AM
Joined: Aug 2003 Posts: 11,179 Atco NJ DJVCuda I Live Here
DJVCuda I Live Here Joined: Aug 2003 Posts: 11,179 Atco NJ	The new ones ( unsure when they changed ) are bushed.

Re: Problems with Comp Pro Magnum Rockers? [Re: A70Runner] #1214724 04/12/12 11:37 AM 04/12/12 11:37 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	I'm guessing you made super sure that they were all lined up nicely w/ the tops of the valves? [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: Problems with Comp Pro Magnum Rockers? [Re: A70Runner] #1214725 04/12/12 11:42 AM 04/12/12 11:42 AM
Joined: May 2004 Posts: 1,151 Las Vegas A afxcoronet super stock
afxcoronet super stock A Joined: May 2004 Posts: 1,151 Las Vegas	I did that twice on my car with the same rockers, switched to harland sharps and haven't had an issue since... Curtis Taking over the World one win light at a time.

Re: Problems with Comp Pro Magnum Rockers? [Re: A70Runner] #1214726 04/12/12 11:45 AM 04/12/12 11:45 AM
Joined: Jan 2003 Posts: 75,020 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,020 U.S.S.A.	Quote: 275 seat 650 open That MAY be your problem, I think those ROCKERS are only good for 500 open. Sharps or T+D's ... $$$$ edit ... Did you make and mods to your oiling to the top end that may be restricting oil ? Shafts on the right way and are they banana groove ? Last edited by JohnRR; 04/12/12 12:30 PM.

Re: Problems with Comp Pro Magnum Rockers? [Re: JohnRR] #1214727 04/12/12 11:54 AM 04/12/12 11:54 AM
Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again Moparnut426 I Live Here
Moparnut426 I Live Here Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again	Quote: Quote: 275 seat 650 open There is your problem, I think those ROCKERS are only good for 500 open. Sharps or T+D's ... $$$$ Fixed it for ya John

Re: Problems with Comp Pro Magnum Rockers? [Re: Moparnut426] #1214728 04/12/12 12:05 PM 04/12/12 12:05 PM
Joined: Jan 2003 Posts: 75,020 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,020 U.S.S.A.	thanks , I have roller lifters on the brain

Re: Problems with Comp Pro Magnum Rockers? [Re: JohnRR] #1214729 04/12/12 12:09 PM 04/12/12 12:09 PM
Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again Moparnut426 I Live Here
Moparnut426 I Live Here Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again	FWIW, I think these rockers with the bushing are far better than the ones that failed in the this thread. Im sure the open PSI is able to be raised a bit.

Re: Problems with Comp Pro Magnum Rockers? [Re: JohnRR] #1214730 04/12/12 12:09 PM 04/12/12 12:09 PM
Joined: Jan 2003 Posts: 13,365 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,365 Marion, South Carolina [><]	Quote: Quote: 275 seat 650 open There is your problem, I think those ROCKERS are only good for 500 open. Sharps or T+D's ... $$$$ Harland Sharps on my solid roller 440 w/ Indy heads...very happy w/ them. They were new in 1989, lol. CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

Re: Problems with Comp Pro Magnum Rockers? [Re: an8sec70cuda] #1214731 04/14/12 05:55 AM 04/14/12 05:55 AM
Joined: Jan 2003 Posts: 3,943 Melbourne.....Oz-land Moparmal master
Moparmal master Joined: Jan 2003 Posts: 3,943 Melbourne.....Oz-land	AFAIK the non-bushed earlier Comp Magnum rockers must be run on banana grooved iron shafts.

Re: Problems with Comp Pro Magnum Rockers? [Re: afxcoronet] #1214732 04/14/12 10:02 AM 04/14/12 10:02 AM
Joined: Jul 2010 Posts: 1,491 Oologah, Oklahoma Big Squeeze pro stock
Big Squeeze pro stock Joined: Jul 2010 Posts: 1,491 Oologah, Oklahoma	Quote: I did that twice on my car with the same rockers, switched to harland sharps and haven't had an issue since... Curtis X2......been there, done that....... If you can't handle the truth, you're living a lie.......

Re: Problems with Comp Pro Magnum Rockers? [Re: A70Runner] #1214733 04/14/12 10:40 AM 04/14/12 10:40 AM
Joined: Feb 2005 Posts: 4,314 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,314 Prospect, PA	To determine root cause, other things need to be looked at like how the rockers are being oiled, side clearence.... That said, you were probably beyond the intended limit for the un-bushed version. At one time, I believe that CC qualified the unbushed rocker at 400# open.

Re: Problems with Comp Pro Magnum Rockers? [Re: A70Runner] #1214734 04/14/12 06:36 PM 04/14/12 06:36 PM
Joined: May 2008 Posts: 62 Indianapolis R Roadrunner451 member
Roadrunner451 member R Joined: May 2008 Posts: 62 Indianapolis	I have used those same rockers (the unbushed comps) at 580 open seat pressure with zero problems. It's a solid roller .648 lift and 262@.050. I drive the heck out of it, and beat on it at the strip as well. The shafts are just whatever came with the rockers. I have never checked the side clearance, but there is not very much at all since I use the Hughes shaft hold downs. If I remember right, I had to mill a little off the sides of thos hold downs to get them to work.

Re: Problems with Comp Pro Magnum Rockers? [Re: Roadrunner451] #1214735 04/15/12 10:30 AM 04/15/12 10:30 AM
Joined: Jan 2003 Posts: 75,020 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,020 U.S.S.A.	Quote: I have used those same rockers (the unbushed comps) at 580 open seat pressure with zero problems. It's a solid roller .648 lift and [Email]262@.050.[/Email] I drive the heck out of it, and beat on it at the strip as well. The shafts are just whatever came with the rockers. I have never checked the side clearance, but there is not very much at all since I use the Hughes shaft hold downs. If I remember right, I had to mill a little off the sides of thos hold downs to get them to work. For every 5 people that have a problem there will be one that doesn't no matter what the item. Glad they are working well for you. Did you modify the oiling to them, maybe go to full time ? A70 this guy brings up a good point , what hold downs were you using and was it held down with bolts or studs ? I was talking to Dan/Performance Only about this yesterday ...

Re: Problems with Comp Pro Magnum Rockers? [Re: BSB67] #1214736 04/15/12 01:16 PM 04/15/12 01:16 PM
Joined: Aug 2003 Posts: 8,716 Baltimore/Denver 64Post master
64Post master Joined: Aug 2003 Posts: 8,716 Baltimore/Denver	Quote: To determine root cause, other things need to be looked at like how the rockers are being oiled, side clearence.... That said, you were probably beyond the intended limit for the un-bushed version. At one time, I believe that CC qualified the unbushed rocker at 400# open. Agree. Unbushed PMs at 650# open, it was just a matter of time. I run them with 350# open and RAS hold downs. Last edited by 64Post; 04/15/12 01:19 PM.

Re: Problems with Comp Pro Magnum Rockers? [Re: 64Post] #1214737 04/16/12 09:51 AM 04/16/12 09:51 AM
Joined: Jan 2003 Posts: 971 Mooresville, NC A70Runner OP super stock
A70Runner OP super stock Joined: Jan 2003 Posts: 971 Mooresville, NC	Side clearance was good. I was running the comp hold downs with arp studs. I am just going with I should not have been running the unbushed ones. Anyway I think I am going to switch to the Harlond Sharps. On the summit site it says you may have to restrict the oil flow to keep the oil pressure up. Did anyone have to do this? Thanks! "People Think I'm Insane Because I Am Frowning All The Time" Black Sabbath

Re: Problems with Comp Pro Magnum Rockers? [Re: A70Runner] #1214738 04/16/12 12:02 PM 04/16/12 12:02 PM
Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again Moparnut426 I Live Here
Moparnut426 I Live Here Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again	Well I didnt on my small block, but I was VERY specific on keeping the side clearance set to the spec. That was oil dosnt bleed between the rockers. May be different on big blocks though. Kasey

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