HEMI Solid Roller Camshaft Valve Lash Setting

[Oldschool]

I was assisting my buddy in adjusting the valves on his new 572 HEMI. It has a solid roller cam in it. Anyway, we were rolling along setting the lash just a tick tighter than what the Cam Card said. As we were going through the valves, I started wondering what the lash was supposed to be on my new 572 HEMI build. I had misplaced the Cam Card. Unable to locate the card, I called the cam folks and they pulled up the info and faxed me a copy of the original spec sheet. They said it was a tight lash cam. The correct lash setting is supposed to be .008 hot and as little as zero clearance when cold. That sounds awful tight to me, but he assured me that the cam was designed for the tighter lash setting. Y'all ever heard of this?

[rUNCHARGER]

Uh, no. Aluminum block and heads, or did he ask?

Sheldon

[Oldschool]

Uh, no. Aluminum block and heads, or did he ask?

Sheldon

Iron block with aluminum heads.

[HP_Cuda]

With solid gear you will have way tighter tolerances to the tune of .026 - .028 whereas a roller setup can be from .30 - .40 with hydraulic lifters.

Does make you feel a bit creepy doing it this tight and hopefully your PTV calculations are spot on because there is not much room to play with if you are wrong. Unfortunately this just comes with using a solid valve train. If you got this info from your cam manufacturer I would double check since .008 is really so minuscule.

On the upside the benefit of a solid valve train is that you are right on it and get all the benefit of the duration and lift of the cam while losing almost nothing to variances because of hydraulics.

[73440]

http://www.centuryperformance.com/valve-adjustment-procedure.html

Those who know more than me can verify the link info, but it seems to explain the process well.

[blown motor]

Cool article for this rookie. Thanks for posting. 

[HP_Cuda]

There is several ways you could do it including the EOIC method.

Exhaust open Intake closed

[73440]

I saw a chart somewhere that shows all the rockers you can adjust with the minimum amount of engine rotations.
You would do multiple rockers per rotation depending on which lifters are on the heel of the cam.

Sounds like EOIC would keep the confusion to a minimum of which are done.