tdeweese

Just as and FYI don't use the COMP CAMS trunion upgrades on LS7 motors with Dual Valves springs and higher lift cams. The attached pictures as after on 1000 miles street driving. I used the proper assembly tool and dial indicator to ensure they were assembled correctly. The base steel and or heat treatment is not adequate for running a bearing on. If you have them better check!!!

Hib Halverson

Whoa.
Maybe COMP has a problem with materials.

Anyone else had this problem?

I still have stock rockers in my motor but, I'd decided, previous to seeing the post above, that, if I upgrade, it's going to be the CHE conversion rather than the COMP trunnions.

Michael_D

I have zero personal experience with this"upgrade". However, I do know more than I care to admit about bearings, in general. One incredibly important aspect of loaded roller type bearings, is the steel used to make them. Another is the QC during the manufacturing process. Another, believe it or not, is how they are transported! In my professional world (oil and gas and power generation, industrial rotating machinery), we only buy US manufactured bearings, and they cannot be shipped via rail.

Knowing what I know, and have learned from some of the most brilliant engineers in the industry I work in, I would not blindly use any aftermarket roller bearing "upgrade", unless I knew exactly where the pins came from.

RedZ4me

5000 miles so far and although I didn't disassemble to check, all sounds normal. So what made you tear them apart in 1000 miles?? Was there a sign?? You are making claims of high lift and dual springs not being good for the Comp Kit but.......... there are single springs with more pressure available than many duals so your assumption is not solid here.

I'm going YT rockers soon and will check mine when removed.

Da Z06

I ask the same question.

What made you check?

MTPZ06

Failures on here have been discussed quite a bit. If I'm not mistaken, the Comp as well as BTR trunions have a "limited" range of motion which makes them a poor choice for high lift cams. A couple highly respected engine builders have told me CHE or stock...everything else is a downgrade. I went with CHE because the stock trunions have less than desirable side-to-side slop IMO.

tdeweese

Car ran great no added valve train noise, I pulled them after finding metallic partials in my oil. Take a look at your magnetic oil drain bolts.

I'm going back to brand new stock or CHE not sure yet.

tdeweese

I am an Engineer and I have access to some of the top Timken Engineers in the business. He told me those type of bearing do not do well when not run spinning in the same direction. He said the reversing action kills them. BTW the bearing are made in the USA.

Unreal

Typically it is just the snap rings or something else that fails on the comp. They are a downgrade if you are going for reliability as they fail more than the factory parts, and offer no benefits, but shops love to sell them.

C6 Curtis

I'm still running OEM rockers at 800+ whp and never changed them since I owned the car.

-Curtis

mourat

Great all that work for a downgrade I really don't want to go back in there for his but I will. Not the first time Comp products failed for me from their cams wearing down to the Comp-R lifters failing and now something as simply as a rocker bearing.

C6 Curtis

I will prob go straight to roller rockers.F* those trunions.

Michael_D

There is another option. Straub Technologies has a kit that is similar to the CHE mod. But, it adds lubrication feed ports, which theoretically, is a better design. I personally do not have experience with this option, so I only mention it as another choice to consider.

lbzraptor

What did the metal particles look like? Maybe long thin strands? By long I mean quarter inch or so

got2hav1

Don't the stock bearings run the same way. Both are needle bearings, so why doesn't the reversing action kill the stock bearings? Just asking to educate myself.

tdeweese

No, very small flakes of chrome looking metal. Enough to make you sick! BTW my motor and car only has 5000 miles on it.

tdeweese

Yes, however he also explained the tolerances of these types of bearing very. I suspect the OEM bearing are of tighter tolerances and therefore better in this application?? I know Katech has alot of success running stock rockers, I will probably go that route since even though some issues have been reported, I believe the stock rockers have a much greater proven track record than any aftermarket trunion "upgrade" rather it be bearing or bushing. Just my 2 cents.

ttx350z

I just installed a set on mine. No way in hell was I going to use the Comp Cams kit.
Attachment 48363347
Attachment 48363348
Attachment 48363349

flyby763

How difficult is the install on the Straub's? Interested in them for sure.

ttx350z

They were super easy with the comp cam trunnion press tool that my buddy purchased. Although you can use sockets if you don't have the tool. His took about 2 hours to do because he pressed all the bearings out, so it was a slow process. I just used a mallet and knocked them out so I swapped all 16 trunnions in about like 45 minutes.

I'd say I have about a 50% reduction in valvetrain noise. I have .040" preload with Johnson 2110 SLR lifters.

Here's the instructions
http://ls1tech.com/forums/generation...l#post19172680