I think I have the only other "known" set on moparts besides Billy. Mine were alledgedly the dyno set used on Dulcich's 408 dyno mule for the original magazine set.

No QC issues except for the fact that the springs Bryce said I got were nowhere near the advertised seat/open pressures stated on the Build sheet. So the second pass down the track they floated #2 intake valve which fortunately didn't cost me more than a tear down and a little emory clean up on the slug.

I called Bryce about it but got ZERO for a reply, no "my bad"....nada. But seeing them disassembled the Port work in the bowls, runners and even the chambers all looked great though. Wondered what they could flow with a PR relo/tube and maybe an offset intake rocker....maybe a legit 315-320? And the only thing that was borderline concerning QC wise was that the port roof to seat cup 'meat' in the casting was a little bit thin on the caliper measurement, but with But we put a new set of PAC's on them and I shift every run at 6800 with a 260/269@.050 .665/640 lift Solid roller Bullet cam.