Comp says that all Magnum solids can be set from .015 to .030(lobe specs in the catalog). My 282 says .022 on the cam card. Do you think this is a large gap? What does this say about the cam lobe?

The Magnums all have Constant Velocity ramps.
This means that wherever you set the lash, from .015" to .030", the lifter/rocker hits the valve at the SAME velocity.
I have NEVER designed cams this way, as it makes the ramps extremely long. I use what Harvey Crane calls 'accelerated' ramps, meaning the looser the lash, the faster the valve opens, the tighter the lash, the slower/gentler the valve opens.
I now have solid flat tappet designs opening the valve at .016" lash just as fast as the old GK roller cams did at .036". The reliability has increased tremendously.

UDHarold

Does this mean the comp cam would not see much performance change by changing the lash and I can go to .015 and cut down on noise?

The noise will be the same, because the velocity is the same....

UDHarold

Thanks for the info

I ran the Comp Magnum 282s in my 383 and the car went faster by tightening the lash from the recommended .022 to .018".

Duration on the seat will increase when tightening the lash. It affected my seat duration 4-5 degrees, .050 duration about 2 degrees and duration at .200" about 1 degree. This is how I determined that my engine wanted more cam -- I eventually switched to the Magnum 294s and went faster yet.

I personally believe that messing with valve lash on one of these Magnum solid cams has more effect on the overlap area. Since it appears that duration at higher lifts is relatively unaffected by lash change, the overlap area seems to be the only place a difference is made.

It made no difference in noise -- the Magnum solids are fairly quiet for being a solid anyway.