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Trunion upgrade

Wayne001

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Is it worth doing a trunion upgrade on stock l77 stock ?
 

07GTS

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its always good to do that upgrade
 

shane_3800

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It's replacing a roller bearing with a brass bush imo it's worth it. I would switch to a brass bush lifter too if I owned one but I have a 304 so flat tappet for me.
 

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^ two styles of trunion upgrade, ones with roller bearings and ones with brass bushes (no rollers), both retained via circlips.



What are the differences in operation between these two styles and which of the two is better and in what way? Also why upgrade from the factory parts on a road car?
 

shane_3800

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^ two styles of trunion upgrade, ones with roller bearings and ones with brass bushes (no rollers), both retained via circlips.



What are the differences in operation between these two styles and which of the two is better and in what way? Also why upgrade from the factory parts on a road car?
In the first video not more than 15 seconds in he explains why you would want to change them.
 

Wayne001

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Has any one heard of the originals failing on a stock motor ?
 

07GTS

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just remove a rocker and then pinch each side with fingers and move it through its ark and u will then feel how much slop they have, the bush ones are good as all play is gone except a little side to side which is normal, mine only had 30k on them when i changed out
 

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In the first video not more than 15 seconds in he explains why you would want to change them.
Unhelpful as obviously I know what is said in the video (I posted it after all). But as they may have a vested interest in spruking such products, I wanted some forum members experiences of them.

And more importantly whether the OEM are an issue on (unmodified, stock) road driven LS3.
 

Milo 6.0

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Rockers don't get noisy,it will be lifters making noise.
Unless your lifters are already making noise change your oil every 10k and give your motor a fighting chance,from what ive read the rockers only fail once large lift cams are added,they weren't designed for large cams anyway.
 

Mavericks Choice

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Keen on doing this mod on mine also, but will put a few more K's on it first.
 

Forg

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A ‘trunion’ is a ... truth onion?
What’s a truth onion?
 

abuch47

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so definitely something youd do with a cam?
 

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^ based on cost of doing a cam, what $3500 odd?, I’d think that would include a trunion upgrade. But if it’s not included, it seems unwise not to add it for the little extra cost.

Still in two minds whether I’d bother doing the upgrade on a stock motor while it’s still under warranty. If it breaks while under warranty, it’s either a new motor or a pp refund (as I see it) :p
 

[paradox]

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ones with roller bearings and ones with brass bushes
i was originally looking into the brass ones, and read that they needed to be replaced as the brass wore down.
dont know if that is actual, or the estimated lifespan though.
 

abuch47

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Anything else you should replace on a stock or say mild cam motor for reliability?
 

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@[paradox], I was helping a business owner friend who had some issue with one of his 20 year old air conditioners. The units all used brass bushes in their electric motors which were an old school commercial design. But they were all still fully functional with no play or slop. One was simply squeaky (which was why I was helping him out). All it needed was some oil poured into a small reservoir where a wick fed the oil onto the brass bush and it was back to being quiet. So I told the owner to keep up with periodic maintenance (yearly check and oiling of bush wick) and they all continued to work well for years more, then he sold the business. At the same time, he had other 2 year old modern aircon which I looked at but it was shagged (gas issues so not cold and roller bearing failure so noisy); cheaply built throw away.

So, the question for me is much the same as you've asked; are these brass trunion bushes designed to last or are they designed using ‘modern methods’ and need periodic replacement. Unfortunately I’ve found no info on their expected life in normal driving (kms, years, etc). I’d also like to know
 

07GTS

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they use bronze bush so they are tuff and last a long time and have oiling groves to aid lubrication, brass wouldnt last long as a rocker bearing
 
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