methinks it's time to retitle this thread, now that you've proven yourself wrong

Lemonhead and Rally1200,

I'd be real interested to know what valve springs you guys are using.

If you are gonna bin your rockers Gary, you should sell them to me real cheap!

Lots of details in our club wiki: Roller Rockers. If you have more information, please add to the wiki article.

Still not happy with these rockers. I have been trying to find the solution so I can run these rockers.

I have had them weighed and each Rolla Rocker comes in at 16 grams heaver. I have spoken to yellow terra and he said that yes the rocker is heavier and it will cause high RPM problems.

he said not only is it heavier but most of the addition weight is on the tip of the rocker and due to its increased inertia makes the valve float problem worse.

They have suggested bigger valve springs but I am trying to decrease valve train stress not increase it.

They also said the chev LS1 rockers have the same problem and to solve this they now make a special light weight version, but there are no plans to do the same for the Datsun ones.

I am now thinking of trying to reduce the weight of the rocker by machining it down?

I'm still bemused
What springs
What installed height
What valves
Whats the valve length
Whats your seat pressures

I'm with dattoman - still seems to only be anecdotal evidence even 8 months later. A more systematic approach would be a good idea. Stop "thinking" that clearance isn't a problem - measure it.

I'd check all the things dattoman listed as well as spring pressure at full lift and all clearances with the increased ratio roller rockers - valve to piston, retainer to guide/seal, and spring bind.

You'd knock that all over in a day and have a real picture of what's happening.

I'm with rally1200, I've taken mine off and at this stage have no intention putting them back on.

Why! I know have a collection of 3 worn out camshafts sitting under the house. Be it a coincidence, but I have only started wearing out cams since the rockers went on, and to be honest I'm sick of pulling the motor out and changing the cam.

The valve springs in it are about 90lb and the tappet clearance is set to the cam grinders specs, I rang y/t and asked if I should use a different tappet clearance and said no use the recmmended.

I have done BULK research on why the camshaft might be wearing out and its come down to two items...quality of todays oil and the roller rockers.

I think the roller rockers would be great in a good street car but under full race situation like what I'm doing I don't they are good at all.

I'm not trying to put people off using them or #### caning them, in my situation they don't suit.

Gary, do you still use the same lifter/followers that you were running with the roller rockers? Did you try the standard lifters/followers with the roller rockers? There could have been a metalurgy or design problem with the aftermarket lifters.

the extra lift of the yella terras and less flex if you use moly pushrods will both put more pressure on the cam lobes.

do you use a pushrod guide with the roller rockers? is there a possible binding problem being caused there?

this is interesting info. do you guys reckon the rollas would be ok for a turbo application that isnt going to rev that hard?