I took a chance and bought summit brand lifters with the summit cam. The valves didn't tap when cold or hot. They tapped when you first fire up the engine until oil pressure comes up (about a second or two) then they are quiet. It sounds like the oil drains out of the lifters and as soon as pressure came up it would fill them back up.
I had the poly locks 1/2 turn after 0 lash. I went one full turn after zero lash and no noise when I fire it up. Don't know why but it worked.
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