Cooldude5231

iTrader: (6)

i have a chance to get a set of YT 1.7's for free.
just wondering if i would need to change anything to install them on my stock motor ls1.
all the mods to my car are in my description. stock cam. stock heads. stock other than whats listed.

also, how much power can i expect to pick up?
all help is appreciated!

Cooldude5231

iTrader: (6)

also the car has a 100 wet kit on it if that makes a dfiference

Old Geezer

iTrader: (3)

This may give you a hint:
https://ls1tech.com/forums/generatio...ocker-arm.html

Cooldude5231

iTrader: (6)

yeah my friend just had one break. seems like the only people that have problems are the ones with h/c packages. i dont, so im not too worried.
just wondering if ill need new pushrods, and how much power i can expect to gain

trans_am7935

iTrader: (15)

I have H/C/I and Yella Terra rockers, it just matters what Gen rockers you have. Where is the 1.7 stamped on the rocker itself? did he include the rocker stand shims? i have been running mine for over 3 years, and have had no problems yet, i also have a high lift cam.

Just an FYI, i am not nice to my motor. They are very good rocker arms, quieted down my valvetrain quite a bit. You should not need to change anything, but really no need to switch to full roller rockers with stock cam, you might see 1-2hp at redline, but not much more. The stock rockers are pretty good already.

Cooldude5231

iTrader: (6)

ive heard different things about how much ill gain. some people say 10whp, others say 20-30.
pretty sure theyre gen 2.
im picking them up tomorrow so ill see if i get the shims too. are they needed?
thanks for the info!

DREAMZ28

iTrader: (1)

I couldn't see a 30 HP gain even if they were 2.0 ratio rockers. You're asking for way too much.

ls1 1990 VN

They are not a power adder!
If anything, you may lose power, Heavier on the nose on the inlet valve .....Better to stick with OEM rockers with Truunion upgrade

trans_am7935

iTrader: (15)

LOL...30hp, someone lied to you buddy. They are meant more to solve the problem when running such high lift or extreme ramp rate cams that the stock rockers cant handle it.

If i could have kept my stock rockers, i would have, but i got my Yella Terras on sale close to the price of the Trunnion upgrade, so i went with new rockers.

02_Orange_D1SC

iTrader: (27)

as long as you buy the newer updated style YT you should be fine

96capricemgr

iTrader: (1)

The HP figures you will see guys talk about are going to be mostly in reference to gen 1 and gen 2 motors where there was a ball fulcrum and aftermarket roller rockers improved true ratio and reduced a lot of friction. The LS1 has a MUCH better factory rocker to start o the potential gains are FAR FAR less.

The potential valve control issues from the heavier parts is very real though and going to make this not worthwhile, particularly if staying the same ratio.

vettenuts

iTrader: (4)

You will gain zero hp with the rockers. You may need to shim them, which then will require different pushrods. You will likely need new valve springs, at a minimum LS6 valve springs since yours are tired if they haven't been changed.

I would not install these, even for free in you situation. To correctly set them up you will have to measure/add several other components.

big hammer

there's mixed reviews. the stock ls1 valvesprings are pretty weak and can't properly control the heavier rocker properly. I've read where guys took the time to change their springs, installed 1.8 rockers and gained 18 rwhp. seems like the guys that don't change their springs see maybe 8rwhp with 1.8's, and maybe none with 1.7's. if you wanted to take the time to put in some better springs, I would do it. y\t's looks pretty easy to install. then once it's all set up it would be easy to throw a cam in if you ever want to.

96capricemgr

iTrader: (1)

You are forgetting shimming and potential pushrods being needed, then with a bigger cam later I suppose he could specifically order lazy lobes to make up for the excessively heavy rocker.