SLP IROC-Z

iTrader: (14)

Havent paid much attention to rockers in the past, whats the census on roller tip rockers like comp non adjustables or are the SLPs a better rocker??

JakeFusion

iTrader: (7)

Stock rockers with the trunion upgrade will be the best bet unless you have a ton of spring pressure or bronze guides.

SLP IROC-Z

iTrader: (14)

That's what my current setup is. I'm also running pac1211x springs. I really don't see the big deal about 1.8 rockers especially with a stock cam

2000PewterT/A

^^^^ x2

cobalt964

I ran a set of summit racing ls roller tipped 1.8 rockers in a bone stock 2007 silverado reg cab swb with a 4.8. It was definitely noticeable. It was more responsive. Ran them for 40k miles on the truck til traded truck in and kept the rockers.

SLP IROC-Z

iTrader: (14)

Just ordered harland sharp 1.8s, ill be putting the car on a dyno when I have it back together

96capricemgr

iTrader: (1)

So you ask a question and ignore the advise given. Even vendors will tell you aftermarket rocks cause so much valvetrain control trouble that they are more trouble than they are worth unless you have bronze guides.

As much as they cost you could have ordered a cam for little more money and had a much bigger gain. Those rockers will be a lot of trouble later when you decide to do a cam.

If you are going to treat your LS1 like a gen 1 and swear rockers are a huge upgrade and refuse reasonable advise this will be a long hard road for you.

Rockers are a early upgrade on older smallblocks largely because ball fulcrums are inaccurate and parasitic. Stock LS rockers are higher ratio with a roller fulcrum already.

c4boom

iTrader: (1)

First off I have no clue why any one would have a problem with a good quality 1.8 roller rocker if it is set up right.
it increases efficiency and is also a good way to reduce side loading of the valve thus increasing the guide life span. The way I see it they are fine if you install all the things that go with them and there are members on hear that have many years and many 10s of thousands of miles on them.

Dark_Pheonix

iTrader: (2)

I'm kind of curious to know if the Harland sharp rockers install with any clearance issues. I have a set of 1.8 rockers from pro comp, and had to mill the head and valve covers for clearance..

JakeFusion

iTrader: (7)

Roller rockers are much heavier over the valve; side loading is a concern only with bronze guides. And the tips of stock rockers only scrub at over .630" lift. The more aggressive the lobe, the more you need to lighten the valvetrain for stability and longevity purposes. 1.8:1 rockers really give high lift with modern, 55mm core LS lobes. Look at the LS7. .700" lift is not uncommon. However, those heads also flow better at .700 than .600 and the valvetrain geometry was set up for that ratio.

Make sure on any roller rocker you have the wipe very narrow and that you have very stout pushrods, good lifters, and lightweight valvesprings/valves to offset the moment of inertia increase.

96capricemgr

iTrader: (1)

Fact is the individuals who swear full rollers are good on mild engines are doing it BLINDLY because of the advantages full rollers offered on older smallblocks, they can't see past the fact the LS1 setup is already a substantial upgrade over older smallblock stuff, all they know is it used to be a good upgrade so it still "must" be a good upgrade. Hell vendors who sell them will say the same thing most of us are about them causing more trouble than anything unless you need them for bronze guides.

It also stands to reason that GM went roller fulcrum but did not bother with the tip because the fulcrum was where the gains were.

SLP IROC-Z

iTrader: (14)

I can see there being an issue running a high lift cam with aggressive lobes however I am running a stock camshaft and will still be under .590 for lift. As far as the rest of my valve train I have chromoly pushrods, pac1211x springs, ls7 lifters and a c5r timing chain.

The only point anyones made that i agree with is that for the money they are not worth the gain however for what I am trying to do it is.

Paul Bell

iTrader: (9)

Here's all the upgrade you need. Anything else is a waste of money and will probably cause problems.
http://www.briantooleyracing.com/btr...union-kit.html

HioSSilver

iTrader: (8)

1.7 harland sharp rockers vs 1.8 harland sharp rockers with a spring change. Full Bolt-on ls6



Decent little change IMO.

96capricemgr

iTrader: (1)

For less money you could do a LS2, LS3, LSA, LS9 etc. cam and get a lot more gain, or little more money you could do an aftermarket cam and get a hell of a lot more gain.
Looks like the Harland rockers are $400ish on ebay, then say $150 for springs, $550 for what is it maybe 8hp and it looks like the power is dropping off faster with the 1.8. Looks like a technical gain but a poor decision from a practical perspective.

DREAMZ28

iTrader: (1)

People aren't considering the weight penalty you pay for aftermarket rockers, I'd rather have a stable light valve train, and most of the pros recommend the same thing.

HioSSilver

iTrader: (8)

Just depends on what you're looking man. My car still idles smooth........and runs every bit as good as alot of h/c combo's.......probably better than most really.

10lbft of tq is nothing to sneeze at right in the middle of the power curve. Your comment about it falling off earlier is kinda dumb though,. It still has more power after it falls off than the 1.7's did at peak and it gets to 400whp 200-300 rpm sooner also. The car runs good to 7000rpm. It also makes more power at 5800 than the 1.7's did at 6500. Gotta look at the big picture man.

Now I'm not saying this is for every cam....or everyone. But if you're happy with your combo and would like to have a little more then it's a easy way to get it. Some guys that already have cams may have enough spring to cover the 1.8 rockers anyway.

96capricemgr

iTrader: (1)

You are BLINDLY defending your choice not looking at reasonable data and ideas. I listed several stock cams that can make more power yet you comment on how yours idles smooth as if the other stock cams have a rowdy idle?

Look at the end of the pull, the 1.8 line is headed to converge with the 1.7 line.

Like I said it IS a technical gain, they did make more power, but for the same money there are ways to gain more.

HioSSilver

iTrader: (8)

I'm not blindly defending anything. I offered up a back to back for people to see. The mod did what I intended. The car picked up with it. It made more power under the curve.......and still had more power when the pull stopped. Your grasping for something to defend yourself there.

FYI.....ls2 and ls3 cams are smaller than my ls6 cam and could likely see more of a gain than I did for a 1.8 rocker change.

Also lets not forget that the ls7 uses 1.8 rockers from the factory.

JakeFusion

iTrader: (7)

If you put stock rockers on there, I bet you'd pick up more than the 1.8s did. You compared one heavy *** roller rocker to another.