trunion upgrade or roller rockers for 383?

[John_LS1]

well, its the the last peice of the puzzle that i need for my 383 build and i'm unsure which way to go with the rockers.

The engine will have a comp cam with .605/.609 lift and lunati dual valve springs. it well be revved hard at any events i take it to but on the street it will only be babied. I'm after reliability here as ive spent a fair bit of money on it and this is the only part in the engine which is still stock.

ive read the horror stories about yella terra rockers breaking and the standard needle roller bearing failing etc. I was keen on a set of the lunati 85425 but i had a hard time getting them through summit so i've some to a dead end.

some comments on what you guys have been running, what conditions, how many kms etc would be valuable to me, Cheers.

[ls1 VN]

Get a set of shaft adjustable Jessels & never look back.

[John_LS1]

Got a part number? How much are they worth?

I thought I would get a few more responses or do not many people upgrade this part?

[Tryhard]

Either Jessel or tds,don't have a part number unfortunately but tds are around the $1500 mark. Check out there website it has their part numbers listed.

[Johnny_ls1]

I've heard a lot of good things about the trunion upgraded rockers, the US guys love them, specially on a budget(I will be using them on my next build). I've heard that adjustable rockers add unnecessary valvetrain weight which is something to be avoided.

[TommyVTss]

i would say that yt rr breaking would be more due to the valve train not being setup correctly,

i have some on my 408 and they are fine, revs to 6800 rpm njessels are the shit but you will pay close to 2k for them,,,


standards are fine imo i have never heard of one breaking but i have heard of the needle rollers failing,

i think sirnemisis on here did a trunion bearing upgrade, i dont know how well it went

cheers

[John_LS1]

cheers, i had a look at the jesels and they do look and sound great but i cant afford there asking price probably a bit overkill for my setup too.

tommy, this is the kind of info i'm after. which yella terra's are you running?

[TommyVTss]

running l92's (off set rocker) ultralites, 1.7 ratios i think from memory around the $600 aud mark landed

[ls1 VN]

You've got a 383ci that you intend from your opening post, to 'rev hard' You have a couple of wayward posts with clowns that have no idea, Hey you can lead a horse to water! If moneys an issue, go with a set of Harland Sharps or just do the upgrade.

[peter b]

Have done cars which produce in excess of 400rwkw with factory rockers without any issue what so ever so anyone realsitically who thinks that because it is factory or because there is other items on the market makes them shit have a bit of research or even r&d to do.
The factory rockers if the whole valvetrain is done properly i.e correct spring not just looking at what lift etc very common thing oh this spring will take the lift. Yes but does it have enough seat pressure and open pressure at higher rpm if the spring aint there it dont matter what you have shit is going to happen. It also comes down to pushrod length seeing as the factory ones arent adjustable all your adjustment is in pushrod length.
Yes some people have had issues with factory rockers but prove to me it wasnt caused by other issues they are only a rocker and they move up and down if you look at the setup and look at how it all works providing everything else is spot on your factory rockers won't be a problem.
Aftermarket rockers whether they be stud mounted or shaft style are alloy but they are also quite big and bulky they will hit the rocker covers and can fail just the same.
Is all about your valvetrain geometry nothing more nothing less.

[ls1 VN]

Have done cars which produce in excess of 400rwkw with factory rockers without any issue what so ever so anyone realsitically who thinks that because it is factory or because there is other items on the market makes them shit have a bit of research or even r&d to do.
The factory rockers if the whole valvetrain is done properly i.e correct spring not just looking at what lift etc very common thing oh this spring will take the lift. Yes but does it have enough seat pressure and open pressure at higher rpm if the spring aint there it dont matter what you have shit is going to happen. It also comes down to pushrod length seeing as the factory ones arent adjustable all your adjustment is in pushrod length.
Yes some people have had issues with factory rockers but prove to me it wasnt caused by other issues they are only a rocker and they move up and down if you look at the setup and look at how it all works providing everything else is spot on your factory rockers won't be a problem.
Aftermarket rockers whether they be stud mounted or shaft style are alloy but they are also quite big and bulky they will hit the rocker covers and can fail just the same.
Is all about your valvetrain geometry nothing more nothing less.

If you want to run standard rockers on a hard revving 383ci without an upgrade go for it, But don't pass that feeble advice on to others.
I wouldn't take this advice for a second.
Minimal, do the rocker upgrade or the failure of the standard needle rollers just may happen.

[stockergts]

Heard the same when I built my 383 I went with comps in the end but I got a bigger cam than the one your running

[peter b]

If you want to run standard rockers on a hard revving 383ci without an upgrade go for it, But don't pass that feeble advice on to others.
I wouldn't take this advice for a second.
Minimal, do the rocker upgrade or the failure of the standard needle rollers just may happen.

I dont make bs claims nor BS advice based on what I can read on the net have a think about things carefully and please tell me how the factory rockers with the VALVETRAIN CORRECTLY SETUP can fail learn how they work and then tell me they are rubbish, The factory rockers are a lot better than you think.

[ls1 VN]

I dont make bs claims nor BS advice based on what I can read on the net have a think about things carefully and please tell me how the factory rockers with the VALVETRAIN CORRECTLY SETUP can fail learn how they work and then tell me they are rubbish, The factory rockers are a lot better than you think.

They most certainly are "with the up grade only"
I asked you once if you were also on LS1 TECH...you need to be, Seems you've only been on here for 2 yrs & have only had limited experience of others misfortunes.
Spread your wings man & read about the LS motors from the guys that know them best & where they come from.
After being on there since 04 I have certainly come across many threads with needle bearing failure.
Those guys & a huge amount of them all race their cars, street, strip,circuit.

Aust as big as it is, is small fry compared to the amount of guys modding the LS motors in the US

[ls1 VN]

Peter B read this..... http://ls1tech.com/forums/generation...Rocker+upgrade

Here's another read. http://ls1tech.com/forums/generation...earing+failure