? Valvetrain Geometry ?

moper said

Pishta, Lash caps will add surface area and as a last resort they could be used. They require matching retainers and only give the rocker tip more area to sweep. With roller cams that is sometimes necesary. But adding area for the sake of keeping the tip away from an edge, is not doing anything to correct the actual path the tip is traversing. So your instability and odd angles are still there.

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I believe that lash caps also add around .030-.060 to the tip of the valve which simulates a longer valve and thus changes the geometry. You can also usually find lash caps that will work with the valves you have. It is true that they do make some retainers with cap reliefs (esp for hemi's) all you really need is enough valve tip to get the cap to seat without putting pressure on the valve retainers under load. I used some from Crower that were .060 deep and .060 on top and they helped the surface area of my Harland Sharps as well as the pattern.

I will agree that more surface area by itself does not help your actual geometry but it does keep the rocker tips from falling off the side of a valve which is not only noisy, it usually breaks things quick.