I've been running Howard's roller hyd lifters.. They have always worked well, but been noisy. I switched from Mobile1 10w30 to AMSOIL 10w30 Z-Rod, for no reason other than it was on sale and I knew the zinc wouldn't hurt anything. My lifter noise went away pretty much instantly.
It doesn't make any sense to me that a high zinc oil designed to protect flat tappet cams would make noisy roller lifters suddenly quiet. I do know that I've stumbled into enough problems, so I'm not going to argue with an accidental solution. Give it a shot.
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77 Trans Am, 469 w/ported E-Heads via Kauffman, matched HSD intake, Butler Performance forged rotating assembly, Comp custom hyd roller, Q-jet, Art Carr 200 4R, 3.42s, 3 inch exhaust w/Doug's cutouts, D.U.I. Ignition. 7.40 in the 8th, 11.61@116.07 in the quarter...still tuning.
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