david_12121

The topic of trunions has been beaten to death on here and LS1 forums and yet I am failing to make a confident decision after reading all the posts I found for hours
i have an LS7 c6z with stock EVERYTHING. And I plan to keep it like that at least for a while, except for reliability mods.
During my upcoming head swap, I'm going with morel 5315 rollers and want to do something about the trunions too.
I've read positive and negatives about stock units, BTR rollers, various bushing types, etc. The only thing the internet has consensus on is that the CC ones are bad.

so long story short, what trunions do you have on your track/race car? How many track/race events have you done? Have you inspected/ measured your bushing style ones after use?

david_12121

Nobody? I'd rather not post in the main forum as I'm more interested in what works for hours of 5-7k rpm use, rather than what someone used for "5k street miles with no issues"!

mgarfias

No idea. I'm leaning towards Jesel or Crower rockers for my rebuild/refresh/enpimpening. I do not like the OE rockers at all.

Sox-Fan

Why?

Have you had one fail?

mgarfias

Not fail. I've had the ends **** up the valve tips. That tells me that there is a problem with friction there. F---- WILL NOT USE AGAIN

Apocolipse

You must have changed something...oem are perfectly fine.

mgarfias

Yes, you're are correct. I'm a ******* tard and swapped out a bunch of things but then just blame the OE part I didn't change.

Moron.

david_12121

Generally I'd take a "I have 50 race hours on the stock ones and had no wear/failures" as proof that they're fine.
unfortunately GM owners enjoy going to aftermarket parts so abused stockiest are rare. Very different to the German car owners I see who replace a broken oem part with a new one part 9/10 times.

Apocolipse

Sounds about right, thanks for clarifying Moron. Have a good one.

mgarfias

So, to expand:

01Z, 71k miles. I've never had the valve covers off until I went to swap springs. Motor was completely original, hadn't even had the 01 re-ring proceedure. Thats when I found the damaged valves.

But thanks for assumign I'm an ******* and did all sorts of things and failing to grasp sarcasm. Also, I'm not the only one reporting this issue, try lookign around on ls1tech.

Level8Drummer

Ok people are getting rude in here, so cut it out. Let's save that disgust for mustang and Porsche drivers, ok?

Anyway. My car is an 02 z06. I bought it with 95k, it has 135k now. I have driven it on track for probably 4 solid years, doing 12 track weekends per year, and probably 2 hours track time per weekend? So that multiplies up to 96 race hours estimated. My engine is totally stock other than a c5r timing chain, chain dampener, and pac 1215 springs. I shift somewhere between 6k and 6.25k every time. I also only drive hard when oil temps are above 200f, and I do cool down laps at 265f. I also do good cool down laps and get oil down to 212f before I shut the car off.

Thaf being said I am on the original rocker arms that came on the car, and I have not had any problems that I am aware of. I am due to take the valve covers off soon though and inspect.

Is that info helpful to anyone?

L8d

NSFW

Keep us posted on what you find.

I had a CHE trunion kit done between buying the car and tracking it. I had too many track days cut short by reliability issues with my last two track cars so I did every bit of preventative maintenance that I could think of with this one.

C5Natie

I went with the Straub bronze bushing trunion upgrade as well as with ARP rocker arm studs. Thats basically as bulletproof as you can make the stock rockers. Should be able to handle all the abuse I throw at them especially when I swap out my cam.

david_12121

Thanks for the input everyone.
i have see quite a few failures of the bushing type trunnions so ended up getting the BTR needle bearing type.
Staying as close to stock as possible while buying a bit of insurance.

Apocolipse

Katech races with OEM rockers. That is good enough proof for me.

david_12121

Do they reuse them for multiple races or a fresh set every race? 24 hours of track time is not that much.

93Polo

CHE had the original version which I thought was some sort of coated trunion with a retainer that wrapped around the trunion multiple times.

They came out with a later customer installed trunion with C clips and I thought bronze bushings when Smith Bros, and Straub came out with their option. West Coast Cylinder Heads was the CHE dealer and could confirm variations. Whatever the design the early CHE trunion seemed to be viewed as the best on the market.