I think JohnRR's Chapman VI's also went right at 350 peak too and with better .200-.600's (from Fast's bench) than any other standard ports I can remember. I think below .350 or so they were even better than my MW 285's. Wish I'd have known when he was selling those...and those numbers were more than 12 years ago. I was thinking at the time....300 cfm at only .450 lift is pretty amazing if you think about it, even a stock replacement Mr sixpack cam in a 10:1 440 would make some serious power and have 14" at idle and a still streetable .557 or .590 purple shaft in a hot 470 would be killer with those .500-.600 numbers.

from the Tech archives:


Chapman CNC'd MP Stage VI 260cc's:

Lift" I/E

.100--71.5/58.2
.200-150.0/118.6
.300-219.4/180.0
.400-278.7/219.4
.500-323.6/233.9
.550-338.9/240.3
.600-352.3/243.5
.650-348.5/246.7
.700-348.5/249.9
.750-348.5/251.5
.800-348.5/253.1