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The most you should have to do is take a little bit of material off the tip of the valve stem so that the lash cah then sets in the recess of the keepers on the tip of the valve.
The lash caps that you speak of are for setting lash on overhead camshaft engines where the cam runs directly over the valve.
I also have some early lash caps that were split---they were a combined keeper/lashcap and worked pretty well but someone then did the recessed ones after the super locks came out which made enough room for the top hat style, but now you had 3 pieces in stead of 2 and worst --one of them is loose
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