19corvette98

I am currently working on a 98 C5 Corvette.
I am swapping to a cam with .600 lift paired with a .660 dual spring.

What are my options for trunion upgrades and what do you suggest? Are you running your suggestion? How many miles do you have on your setup? Any issues?

Really I am debating bushing vs needle.

The reason I am asking is I went with with the Comp Cams Trunion upgrade kit and I am disappointed with the quality of their product. They were shipped in plastic bags within a cardboard box. So the trunions were bouncing off each other in shipping. Several had nicks on the trunion bearing journal (where the needles contact). Also while inspecting the bearings I found that 2 needles out of a bearing were missing (they offered to send a replacement). I also did not like that many users saw the needle bearings wear into the trunion with this kit..

vettenuts

Had that happen to some caliper pistons I bought. When they arrived they were useless due to the gouges in the metal sealing surface.

I personally prefer the bronze bushings being sold by Chris Straub.

DetroitPlac

I second the Straub kit. It's also repackaged under other vendor's names...I bought mine from ColoradoSpeed.

I like the brass bushings instead of needle bearings. The kit is high quality, install a breeze and they're very quiet.

romandian

the trunions a supposed to be hardened. if they have nicks because of bouncing against each other thats really weird.

Tusc

I chose the Straub design.

I'm glad it is more commonly known now, too.

Though if anyone wants a comp kit, I do have one nib which I had bought and then decided against.

Smoken1

At least I'm not the only one to have nib extra set that I never used

neutron82

my comps with less than 10k miles... needless to say they were replaced with straub's kit

leadfoot4

This has been discussed numerous times, but anyway, here's my $0.02.....


I initially installed the Comp Cams kit, years ago, when OE failures were first noted, and the Comp Cams kit became available. My car is a stock C-5, and driven in a "reasonable" manner.

I became concerned, last year, when reports started coming in about the Comp trunnions were showing wear issues. The Straub trunnions were available at that time, so I removed the Comp trunnion kit, and installed the Straub bushing kit.

Conclusions....my Comp trunnions didn't show any wear. The Straub bushings significantly reduce valvetrain noise. The cost for each kit is similar. In retrospect, I probably should have gone with the CHE bushings, years ago, because over time, the cost would have been the same. Yes, CHE wanted $400 to install their bushings/trunnions in my rocker arms (no "kits" available for DIY), and yes, there would have been more "down time" for the car, but OTOH, I would have done the job only once.

493lszosix

I decided to replace my comp cams a couple months ago with the straub kit after seeing pics of some of the wear issues, these have about 23 thousand miles on them, a few of them showed no wear while most looked like the ones on the right

neutron82

493lszosix, is your car cammed?... it seems like the cars with cams are having the wear issues and cars with stock cams not so much, as in leadfoot4's case... and the op is installing a cam so I personally would stay away from comp... I brought it to their attention after taking mine apart and they tossed me around to a few representatives all of which said they had never seen this problem before which I found strange and ultimately they quit communicating with me... to my understanding the general consensus is that there is a hardness issue with comp's kit that causes them to fail, hopefully they rectify the issue so their parts don't continue to fail for people that are unaware of what could happen

ZZ06

Sigh....IRC I sent my stock rockers to Brian Tooley. Alas it was the comp upgrade that went into them. They were used with the second cam as I was becoming nervous after my first cam was ate by a lifter. Now the rockers are in my stroker. You guys can make a man nervous If I had to take a stab at the miles on them since the trunion upgrade, id say somewhere in the ball park of 20k+ miles. No issues thus far. Then again I'm not a track junkie either so....

493lszosix

[QUOTE=neutron82;1594664321]493lszosix, is your car cammed?

Yes it's cammed, first with lg g5x2 and now has the x3 their around.600 lift, I took a couple off and they didn't seem to have any play in them or feel loose but decided to go ahead and freshen it up before track opened this year, I don't know if they would have come apart but glad I changed them

Rx7Rob

My comps were trash in about 4kmi, with cam and HPDE use. When I get a chance I'll measure the hardness of the trunnion. The roller bearings are too small for me to measure.

I replaced with CHE bushings.

marc a

I went the Colorado Speed route as well. Came packaged in such way as it was impossible for the trunions to touch each other. Bushings were packed in pairs end to end so they could scratch or dent.

Very happy with the quality and concept.

Marc

Tusc

So what is the issue with the Comps.... more a material problem, design issue, or just general lack of lubrication?

leadfoot4

If I were to hazard a guess, I'd say it's a combination of materials and design. Too soft or not properly hardened a material, for the high valve spring rates of "big" camshafts.

Patches

I got the same runaround from them a few months ago. I have a new Comp trunnion kit that has been sitting on the shelf for almost two years due to this issue. I decided not to install them on my stock rockers when I read about this here. I originally bought them from Colorado Speed but it was too late to return them so there they sit. I am running HS rollers so I haven't upgraded to the Straub kit on the
stockers yet.

punz

When I installed mine 2 years ago, I really juiced them up with assembly lube on everything. Curious to see what they look like when I swap springs next year. I personally think it is lack of lube, people installing right out of the box.

neutron82

I would say they are probably too soft for anything other than stock it seems like... I wouldn't consider my cam big and I'm running pac 1518 springs which aren't insane stiff either... either way I will never recommend them to anyone else I come in contact with whether their car is stock or not

some of the "reps" I talked to claimed to have had comp's kit on their own personal car with over 30k miles, big cam, yadda yadda, and never had an issue... I find that very hard to believe that they have never even heard of it happening and I understand stuff happens when you mod cars but I would have more respect for them if they just come out and admit there was a problem and do something to fix it rather than just ignoring people

Patches