how much valve lash for this solid roller?
 

A used solid roller and companion lifters is on its way to me from a friend. He doesn't recall the lash it used. Can somebody give me the lash range one can use on the following used cam ? ( 1500 miles of use w/ ~ 20 passes @ the strip) :

Comp Cams special grind solid roller
285/291 @ .015
248/254 @ .050
112 LS inst@108
gross VL= 577/583

I plan on installing it on 110 or 112 ICL
Thanks

There is a pretty similar SBC shelf cam. The suggested lash on it is .016/.018.

Start there, then test lashes up & down from there to find where you motor runs best. I'd do intake first. Then once the best intake lash is found, start testing on the exhaust.

Just a thought call Comp cams.

lash & lift
 

i use a cam sim to that, havent lashed in a while but i think i am at 18 - 20.
depending on what pistons you have or if they have been worked, you could have enough piston to valve clearance.

Most cam companies keep work order for custom grinds so a call to C/C ought to get you the correct lash. I have a Pontiac roller cam from Crower that I bought used and found out the lash settings from calling them years ago.

Six out of the seven cam cards I have on hand for Comp solid rollers listed 18/20, and I thought I was going to be able to report a clean sweep. Then looked up the seventh and Comp listed 16/18. Oh well...

The lash is determined by the lash take up ramp designed into the lobe. Some are as little as .016" and some are as much as .030". It is important to know what it is designed for before you go experimenting too much. You can vary some from what it's designed for, but if you get too far outside it's parameters, you can ruin your cam.

This is a question for the folks who ground the camshaft. Varying from where it is supposed to run can have pretty significant effects on how the engine runs as it changes the actual opening and closing points of the valves, in addition to being hard on the lobes as Paul mentions above......Cliff

In the end you need to check your lash with the motor hot after a run.
If you have aluminum heads you will find the lash opening up some .006" to .008".
Taking this into account will let you set the lash with the motor cold.

I'll suggest they are Comp XE lobes 4875-B and 4876-B

The 'B' lobes typically have 0.001" additional lobe lift, here it will be .3850" & .3890". Also the seat or advertised duration on the intake will typically vary by one degree less. Here 285 degrees at 0.015" instead of 286 in the catalog.

The cam card should suggest 0.016" lash.

On the back of the cam the lobe #s are generally etched and you can look them up from that, or the ID # and Comp can tell you.