ss.slp.ls1

iTrader: (36)

Anyone on here successfully use these rockers on a LT1?

I have already opened up the stud holes to 3/8" to fit over the stock size studs. I test fitted one of the rockers on a buddy's car as we were installing his cam. The rocker fits, but it looks as if it needs a rocker arm stud that is ~1/2" taller than stock to fit. Then doing so I would assume that after using poly locks he would need to get some taller valve covers.
Is that right???

SS RRR

iTrader: (2)

What do you mean by stud holes? Do you mean where the stud goes through the fulcrim?

ss.slp.ls1

iTrader: (36)

Exactly.

SS RRR

iTrader: (2)

How did you do that?

ss.slp.ls1

iTrader: (36)

I have two friends who are machinists. One made me a miter bit that starts off at the diameter of the stock fulcrum hole of the LS1 rockers and contours to 3/8". The other used that tool on his drill press with a special fiberglass thing to keep the rocker fulcrum centered on the drill press.

Now I was wondering what others have need to have done to apply them to LT1 heads.

Revelation Z28

iTrader: (10)

there was a topic that linked to another forum or somewhere with a full out detailed how to.

here it is: http://www.camaroz28.com/forums/showthread.php?t=596685

ss.slp.ls1

iTrader: (36)

Thanks. Looks like with some ARP heads studs (already planned) that the poly locks will be able to hold down the rockers. Only thing that worries me is the original poster in that thread used these rockers with a CC503 cam and LT4 valve springs which is impossible if he was getting a true 1.7 ratio...

JAKEJR

The geometry in the photo the other guy posted is awful. No wonder he broke a retainer. I'm just surprised it didn't happen sooner; he's lucky not to have dropped a valve.

For me, I just installed a set of Scorpion 1.7s yesterday on my son's 96 LT1. For those who, for whatever reason, don't like Scorpions, CompCams sells 1.7s for our engines, too. They much more costly though. I've got the part number floating around here somewhere if anyone wants it or you can just call Comp.

Just my views.

Jake

West Point ROCKS!

ss.slp.ls1

iTrader: (36)

Yeah I know there are other options for 1.7 rr's. Thing is that my buddy is unemployed and his car is down right now. He is getting a KILLER deal on a new complete engine with a brand new CC502 and a new 4L60E. Right now the engine has stock rockers and LT4 springs. I wanted to help him do something to upgrade his vavle train. I'm going to get him to buy better springs. I have these LS1 rockers that were given to me for free, modified for free, so I figured they'd be better than stock...

My95Z

iTrader: (8)

Won't you have to run guideplates and hardened pushrods too, since the LS rockers are guided by the plate that they sit on?

ss.slp.ls1

iTrader: (36)

Yes that was already planned. The price of guideplates is only 16 bucks. ARP rocker arm studs are only 38 bucks. I know a guy that can get us a NIB Crane 10308 spring kit for ~150. He already has a set of 7.2 Comp hardened pushrods (I will still be measuring), so considering the rockers were free, modified for free, it'll be cheap for the overall valve train. Forgot, also need a set of poly locks, but that's no biggie.

the_merv

iTrader: (88)

There was someone here that did it..it was posted a while back.

Yea you may have the have Guideplates like mentioned above cause the LS Engines have the Pedistals that the Rockers bolt to.

The only thing that I would worry about is the friction of the Rocker Tip and the top of the Valve Stem. The LS Engines are a 15* Head, so when the Rocker pushes down the Valve, there isn't alot of movement on the tip9may be the reason a roller tip wasn't needed). The LT1 is a 23* Head, that Valve angle may pose a problem in the long run. JMO...

My95Z

iTrader: (8)

I was just wondering how you were doing that/how it works. I thought you found some way to mount the pedistol or something lol.

ss.slp.ls1

iTrader: (36)

I see what you are saying, but I don't see how the friction could be much higher than the amount of friction that the stock rockers have. Not to mention the needle bearing fulcrum should reduce some friction, but the higher rocker arm ratio is more of what we are going for with this.

speed_demon24

iTrader: (6)

So you are going to continue with this even after seeing this picture?

ss.slp.ls1

iTrader: (36)

^^^In that pic it doesn't look good, but I've already test fitted the rocker on my other buddy's LT1 while we were installing his CC503 since we already removed his Comp magnums(the LS1 rockers aren't going on his car, it's going on my other friend's car with a CC502). The rocker tip is always in contact with the valve stem and it looks like it will work fine, the valve stem is well under the rocker tip. I just wanted him to have something better than stock because he can't get them himself.

My95Z

iTrader: (8)

Well keep up up to date with this project and I hope yours come out better than the ones in the picture!

ss.slp.ls1

iTrader: (36)

They don't look so bad in this pic.

My95Z

iTrader: (8)

I guess its not as crucial for contact pattern b/c they aren't rollers on the tips, it just doesn't look like its using all 1.7...more like 1.6 or so of the rocker. Of course it doesn't ride on the tip on the LS motors either.

When you get her all t/g put a dial gauge on one of the retainers and see what you actually get for lift. Again best of luck!

the_merv

iTrader: (88)

The look about the same as the one above.. I wouldn't trust that geometry IMO..here's where they should belong..



Why wouldn't it get a 1.7 ratio lift? The Pushrod & Lifter is still going to move the same amount of distance regardless if it's a 1.5, 1.6, or 1.7 ratio Rocker. I don't see why it wouldn't move it the full 1.7, I just don't agree with that Rocker on these 23* Heads.

I'm suprised no one has tried the LS7 1.8 Ratio Rockers on something yet.