SS RRR

iTrader: (2)

The production LT4 used Crane Gold aluminum rockers. They are fine for any application.

T/ALT1

iTrader: (3)

Thats is totally untrue. I had a set of Crane golds with a CC306 and they failed so I don't have much faith in those Cranes either. I went to a solid roller/shaft monut rockers, Manton pushrods and anytime I check lash it's always perfect.

SS RRR

iTrader: (2)

The detail you supply regarding your failure is overwhelming. What I get is it's "totally untrue" in your opinion. I wonder when mine are going to blow up...

SPDEMON

Just curious, do the ultra pro mags click like the scorpions when you tighten down the poly lock? I kinda dig that, takes a little of the paranoia out of wondering if they are tight enough...

96capricemgr

iTrader: (1)

What is clicking? I would worry about something cracking if I heard that.

94FBIRD

iTrader: (5)

Ruh roh, Shaggy! I don't think you are adjusting them right.

SPDEMON

You guys are funny.

Here: https://youtu.be/LpkrNouFauA

Listen to the rocker poly nut at 6:30 in this vid

SPDEMON

I wasn't aware that some brands did this either, and the rockers he appears to be adjusting are Scorpions. Hence the question. .

94FBIRD

iTrader: (5)

I don't know what you're talking about, that video didn't have any clicking. I currently have Scorpions on my car right now, and no, they do not click when I (properly) adjust them.

SPDEMON

Obviously you didn't watch the video. At 6:30 in the video, he says "some of these click when you tighten them down, and these ones do." So either the scorpions you have are not the ones on this video, or you actually aren't getting your poly nut tight enough but think that you are.

So maybe you aren't "properly" adjusting them as you might think.

cardo0

Its common for poly locks to get lose unless locked up with a final snug/bump/twist. I really liked how he pointed out all the clearance checks for the rocker arm and some of the results of not doing so - for those with roller rocker arm noise. Myself i tighten the poly nut until the p-rod just starts to drag but can see how that can be overdone if watching the poly nut instead of the p-rod. That screw thread adds a lot of mechanical advantage and it would be easy to over-tighten when just looking at the nut. Nothing wrong with just getting the up and down slack out for setting zero lash.

Thx for sharing.

BTW the video is wrong with regard to maximum power using 1/8 turn though. Oil aeration is worse with less pre-load. And yes some will set preload to fix the piston travel as low as 0.010" using feeler gauges for those in disbelief.

SPDEMON

He didn't say 1/8 of a turn is best or makes most power. He just said that tight is quiet, but loose makes more power.

And that is true to an extent. It really depends on lifter pre load.

But the video is really informative and the guy is clear and basic.

96capricemgr

iTrader: (1)

With original LT1 lifters I tried several settings from 1/8-5/8 maybe even a little more, with an under control valvetrain I didn't see a difference in performance.

SPDEMON

I hear ya. I doubt it's a "seat of the pants" type difference unless the motor is really pushing some power. Plus, on a street car, I'd sacrifice a few horsepower for a quiet valvetrain....

SS RRR

iTrader: (2)

https://www.youtube.com/watch?v=ee92...etailpage#t=14

cardo0

Testing preload adjustments for results would need controlled conditions and recorded results. If u think every engine oil and every engines windage oil control is the same then there is no difference in preload settings in your mind and nothing can change that. U can be happy with using hearsay to set your preload by your feelings instead of facts.

SS RRR

iTrader: (2)

Leave it to you to overcomplicate the living snot out a simple procedure, and you've been asked several times to post up your resources with these claimed "facts."

ACE1252

If I recall correctly, the directions for my Pro Mags stated 1/2 turn preload. That's where I set them.

http://www.compcams.com/Instructions/Files/151.pdf

As far as poly locks(purchased ARP) loosing up, I torqued the allen(while holding the nut in place to maintain 1/2 turn preload) to 30 lb-ft. If you use a torque wrench, there is no guessing if you got them right.

I have not touched them in 5 years. None have loosened up.

cardo0

U set your lifter preload to match the rocker arm instruction instead of the lifter? Thats funny! Thx for sharing your expertice.

ACE1252

If you think I'm trusting your experience over Comp Cams instructions you are an even bigger idiot than I already know. Nothing personal. You have simply shown far too much ignorance in your knowledge base for me to ever trust you. Along with no willingness to learn or admit to when you are wrong. I think you just like to troll anyone who has sense enough to know when you are full of it and point it out.