Comp Cams Shaft mounted rockers
Comp Cams Shaft mounted rockers I just saw these on Thunder Racing's site and had a couple of questions you guys might be able to answer. Besides looking pretty damn good, what are the benefits of having these rockers as opposed to Yella Terra's? I'm going to be swapping my stock rockers in the near future with stock ratio ones (read too many threads of LS1's spewing out their rocker bearings, just trying to be on the safe side), but want to know the difference in performance between the two. The price suggests a pretty big difference, but I want to know specifics. How do they mount on the head? Are they a direct replacement for the stockers or do you need valve cover spacers or any other modifications that need to be done for them to fit?
Launching!
Joined: Mar 2003
Posts: 250
Likes: 0
From: Oceanside CA
Originally Posted by Krab
Anyone?
What needs to be done,clearence the pushrod hole,shorter pushrod[7.1/7.15,have to measure] and valve cover spacers or taller vc.
They are adjustable and mount like the stockers.I am waiting on vc spacers to mount mine.The YellaTerras seem to work well with less alterations but are not adjustable.
They are adjustable and mount like the stockers.I am waiting on vc spacers to mount mine.The YellaTerras seem to work well with less alterations but are not adjustable.
Staging Lane
Joined: Oct 2003
Posts: 71
Likes: 0
From: Florida
Unless your running a lot of RPM all the time, you don't need the shaft mount rockers. You can get a good stud mount roller rocker that will fit WITHOUT valve cover spacers, head machining, or any of that mess. Plus, you won't melt your credit card buying them, which means more money for other improvements.
Originally Posted by jfm
What needs to be done,clearence the pushrod hole,shorter pushrod[7.1/7.15,have to measure] and valve cover spacers or taller vc.
They are adjustable and mount like the stockers.I am waiting on vc spacers to mount mine.The YellaTerras seem to work well with less alterations but are not adjustable.
They are adjustable and mount like the stockers.I am waiting on vc spacers to mount mine.The YellaTerras seem to work well with less alterations but are not adjustable.
You are referring to the comp cams adjustable 1.75 rockers, the shaft mounts are different, they look like this.
Also according to comp cams these fit under stock valve covers just fine
Quote from comp website about shaft mounts
COMP Cams®, the leader in valvetrain technology, is proud to introduce aluminum shaft mount rocker arms for the GM LS1 engine. The COMP Cams® LS1 shaft rockers require no machining and install under the stock valve covers; making them one of the most cost efficient ways to increase horsepower for this popular GM application. The system increases performance by correctly aligning the roller tip with the valve centerline, yielding more effective lift and less valve stress. Through sophisticated engineering and superior materials, COMP Cams® shaft rockers remain rigid and durable under even the most severe spring pressure.
http://www.compcams.com/Technical/Catalogs/RC2003.pdf
They also offer a 1.8 ratio set part #5054180
http://www.compcams.com/Technical/Ca...L/313-317.html
Btw I just purchased a set of these brand new from ebay for $779 shipped
Last edited by CamaroSS_2002; Nov 10, 2003 at 12:38 PM.
TECH Fanatic
Joined: Jun 2003
Posts: 1,070
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From: Further South than Hell
Yeap I run these with 1.7. I like them and they take away most of that LS1 slap. Too expensive though for 400+ level performance but a jewel once you get in the 500+, makes the valvetrain much more stable.
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Originally Posted by 4thGENRETARD
Yeap I run these with 1.7. I like them and they take away most of that LS1 slap. Too expensive though for 400+ level performance but a jewel once you get in the 500+, makes the valvetrain much more stable.
Originally Posted by Phil99vette
I will never buy from this company again. They dicked me over pretty good. IMO go Jessel or T & D. They dont fit under the stock valve cover.
Phillip
Phillip
Originally Posted by CamaroSS_2002
I figured they would. Just to make sure you don't have aftermarket valve covers or spacers do you?
You talking about the Jesel or T&D not fitting? Cause I know they don't. ... or is it you are saying the comp shaft mounts don't fit? -- The adjustables just advertise they fit under stock vavle cover without clearancing in most cases -- but the shaft mounts they are saying have no problems
You talking about the Jesel or T&D not fitting? Cause I know they don't. ... or is it you are saying the comp shaft mounts don't fit? -- The adjustables just advertise they fit under stock vavle cover without clearancing in most cases -- but the shaft mounts they are saying have no problems
Heads to be machined(required removing)
Shorter pushrods
THEY DONT EVEN COME CLOSE TO FITTING WITH STOCK VALVE COVERS.
If they dont fit the stock valve covers why buy their product. For the same money get a nice beefy shaft mounted rocker. If you look at the Jesel's or the T & D the shaft is much thicker. Bigger is better IMO.
Phillip
Originally Posted by Phil99vette
Those rockers need:
Heads to be machined(required removing)
Shorter pushrods
THEY DONT EVEN COME CLOSE TO FITTING WITH STOCK VALVE COVERS.
If they dont fit the stock valve covers why buy their product. For the same money get a nice beefy shaft mounted rocker. If you look at the Jesel's or the T & D the shaft is much thicker. Bigger is better IMO.
Phillip
Heads to be machined(required removing)
Shorter pushrods
THEY DONT EVEN COME CLOSE TO FITTING WITH STOCK VALVE COVERS.
If they dont fit the stock valve covers why buy their product. For the same money get a nice beefy shaft mounted rocker. If you look at the Jesel's or the T & D the shaft is much thicker. Bigger is better IMO.
Phillip
I Pm'd 4thgenretard and he said he has them(the comp shaft mounts as pictured above) running without any clearance issues
I also just noticed you are running the 5.3L heads. I wonder what 4thgenretard is running? Maybe he'll chime in.
Originally Posted by CamaroSS_2002
What are you saying by those rockers? the Jesels, the T&D, the comp shaft mounts or the comp adjustables?
I Pm'd 4thgenretard and he said he has them(the comp shaft mounts as pictured above) running without any clearance issues
I also just noticed you are running the 5.3L heads. I wonder what 4thgenretard is running? Maybe he'll chime in.
I Pm'd 4thgenretard and he said he has them(the comp shaft mounts as pictured above) running without any clearance issues
I also just noticed you are running the 5.3L heads. I wonder what 4thgenretard is running? Maybe he'll chime in.
Well, I'll call BS. The valve covers for the LS1 have nipples for the bolt holes which will hit the rockers. The passenger side has 2 dividers which run side to side which will also hit the rockers. Comp said that DRE was making them and I have the ones from DRE with heavily ground valve covers. They don't fit. DRE even said that they dont fit. I called Comp cams, they verified DRE was building them and they don't fit the stock valve covers. That company will never see another dollar from anyone I know.
Phillip
Originally Posted by Phil99vette
CamaroSS_2002,
Well, I'll call BS. The valve covers for the LS1 have nipples for the bolt holes which will hit the rockers. The passenger side has 2 dividers which run side to side which will also hit the rockers. Comp said that DRE was making them and I have the ones from DRE with heavily ground valve covers. They don't fit. DRE even said that they dont fit. I called Comp cams, they verified DRE was building them and they don't fit the stock valve covers. That company will never see another dollar from anyone I know.
Phillip
Well, I'll call BS. The valve covers for the LS1 have nipples for the bolt holes which will hit the rockers. The passenger side has 2 dividers which run side to side which will also hit the rockers. Comp said that DRE was making them and I have the ones from DRE with heavily ground valve covers. They don't fit. DRE even said that they dont fit. I called Comp cams, they verified DRE was building them and they don't fit the stock valve covers. That company will never see another dollar from anyone I know.
Phillip
Just out of curiousity has anyone else ran into these problems?
Son of a motherless goat. So they do need spacers then. Why would they state valve cover spacers aren't needed when indeed they are? 
Are there any good shaft mounted rockers that don't require machining of the head or valve cover spacers? I believe I read the T&D ones on Thunder's site need the spacers.
Are there any good shaft mounted rockers that don't require machining of the head or valve cover spacers? I believe I read the T&D ones on Thunder's site need the spacers.
Originally Posted by Krab
Son of a motherless goat. So they do need spacers then. Why would they state valve cover spacers aren't needed when indeed they are? Are there any good shaft mounted rockers that don't require machining of the head or valve cover spacers? I believe I read the T&D ones on Thunder's site need the spacers.
Are there any good shaft mounted rockers that don't require machining of the head or valve cover spacers? I believe I read the T&D ones on Thunder's site need the spacers.I'm waiting on a response from thunder on this question.
Also all of the other shaft mounts available require spacers.
Last edited by CamaroSS_2002; Nov 10, 2003 at 09:42 PM.
TECH Fanatic
Joined: Jun 2003
Posts: 1,070
Likes: 0
From: Further South than Hell
Originally Posted by Phil99vette
CamaroSS_2002,
Well, I'll call BS. The valve covers for the LS1 have nipples for the bolt holes which will hit the rockers. The passenger side has 2 dividers which run side to side which will also hit the rockers. Comp said that DRE was making them and I have the ones from DRE with heavily ground valve covers. They don't fit. DRE even said that they dont fit. I called Comp cams, they verified DRE was building them and they don't fit the stock valve covers. That company will never see another dollar from anyone I know.
Phillip
Well, I'll call BS. The valve covers for the LS1 have nipples for the bolt holes which will hit the rockers. The passenger side has 2 dividers which run side to side which will also hit the rockers. Comp said that DRE was making them and I have the ones from DRE with heavily ground valve covers. They don't fit. DRE even said that they dont fit. I called Comp cams, they verified DRE was building them and they don't fit the stock valve covers. That company will never see another dollar from anyone I know.
Phillip
But I didn't say I didn't have to do a little grinding before the grinning.
TECH Fanatic
Joined: Nov 2001
Posts: 1,027
Likes: 2
From: KS
I'm running these rockers right now. It's already been said yes they do need spacers. I about crapped when I saw how much spacers were. I'm running 1" spacers that I made. (I have CNC machines) These rockers I have only have about 80 miles on them right now. So for now I can't report on durability.
As far as machining the pushrod hole, it can be done with a dremel tool. It's not really machining. It's just elongating the hole in the head where the pushrod goes through. It's just a thin "web" of aluminum. It cuts like butter but you NEED to have the heads off. I bought my rockers when I was building the motor. None of this was a concern as it was just part of the build.
Phil do you still got your rockers?
As far as machining the pushrod hole, it can be done with a dremel tool. It's not really machining. It's just elongating the hole in the head where the pushrod goes through. It's just a thin "web" of aluminum. It cuts like butter but you NEED to have the heads off. I bought my rockers when I was building the motor. None of this was a concern as it was just part of the build.
Phil do you still got your rockers?
Originally Posted by 2000RATA
I'm running these rockers right now. It's already been said yes they do need spacers. I about crapped when I saw how much spacers were. I'm running 1" spacers that I made. (I have CNC machines) These rockers I have only have about 80 miles on them right now. So for now I can't report on durability.
As far as machining the pushrod hole, it can be done with a dremel tool. It's not really machining. It's just elongating the hole in the head where the pushrod goes through. It's just a thin "web" of aluminum. It cuts like butter but you NEED to have the heads off. I bought my rockers when I was building the motor. None of this was a concern as it was just part of the build.
Phil do you still got your rockers?
As far as machining the pushrod hole, it can be done with a dremel tool. It's not really machining. It's just elongating the hole in the head where the pushrod goes through. It's just a thin "web" of aluminum. It cuts like butter but you NEED to have the heads off. I bought my rockers when I was building the motor. None of this was a concern as it was just part of the build.
Phil do you still got your rockers?
Is it also true that shorter pushrods are needed as well?
Staging Lane
Joined: Oct 2003
Posts: 71
Likes: 0
From: Florida
Just curious, how much RPM are you guys seeing? Just trying to understand why you're hooked on shaft mounted rocker arms.
I had read on other posts in this area and the truck area that the Comp shaft mounts don't fit without serious modifications.
If you've ordered them and they won't fit, wny not just send them back and find something that does?
I had read on other posts in this area and the truck area that the Comp shaft mounts don't fit without serious modifications.
If you've ordered them and they won't fit, wny not just send them back and find something that does?