I bought two of 'em a few years ago just because they were cheap (for hr cams) at $140 for the pair shipped, off of ebay back when guys were replacing them in Ramjet and HT383 crate motors with stupid thumpy cams. My brother needed one and I'm planning to use the other in a 336 (3.75 stroked. 040 over 305 block) with L98 aluminum heads. My guess is that the ZZ4, while a really good cam (used a couple of 'em) for appropriate use, just might be a bit more &.
474/.510) than your heads and tune will handle.
