Well after i took the motor back out and gave it to the engine builder, he found that he acidently put the timing off by one tooth. I took the heads off and the valves were kissing the pistons leaving a half moon mark on them.
So, two things that I would consider pretty much “mandatory” for a build like this obviously didn’t get done.
Cam didn’t get degreed, and valve to piston clearance not verified.
I dynoed a very mild 505 last fall that was similar, but milder.
Stage 1 rpm heads, .483 lift hyd cam, original Torker, 850vs carb, 1-7/8” headers.
I told him it would make about 600ft/lbs and 500hp.
It made 628tq/515hp.
With an RPM intake and the OP’s cam I would have been looking for another 40-50hp.
Back in about 1990, on a 500hp 440 I tested an original Torker against a Torker II.
The Torker II had noticeably better top end power than the original Torker, which resulted in a peak gain of about 15hp, but at the top of the run it was more like a 30hp difference.
The original Torker had better bottom end and made about 15ft/lbs more peak tq.
