Just found your forum!
I bought a ZZ4 for my '73 Corvette and am having a problem getting the valves adjusted. I adjusted them the way I always do.
Basically I spin the engine to TDC Compression stroke on #1. Adjust exhaust for 1,3,4,8 and intake of 1,2,5,7
Rotate one full turn (TDC Compression #6): adjust exhaust 2,5,6,7 and intake of 3,4,6,8
This has always worked until today. For some reason I believe that when I have the cylinder at TDC, the lifter to be adjusted is NOT on the very bottom of the lobe (fully closed) because after the adjustment (I tried 1/2 turn from zero lash the first time and then a whole turn the second time I adjusted them) because they are even noisier/looser then before I touched them.
Is it possible that the steel roller cam in the ZZ4 is somehow configured differently than other camshafts?
Thanks in advance for any help.