Is there a good chemical to quiet lifter in my '51 Lincoln flathead

[G.M.]

Originally Posted by northeastcarnut

I'm still trying to solve my problem with a noisy lifter in my '51 Lincoln flathead. Is there a good reliable chemical I can add? The noise appears only after the engine runs and warms. When cold, it's quiet and runs great. I have run lots of Mystery Oil in the crankcase, but no help. I'm now running fresh 40W non detergent oil.

What is the oil pressure cold right after startup? And what is the
pressure when it warms up and the noise starts? Also does it get
louder as the pressure gets even lower? G.M.

1- oil pressure at startup--
2- oil pressure when noise starts--
3- oil pressure when hot--