Quote:

Though not a B-1 Chuck from best did a header test a while back and posted it. I believe it was an 572 -1. The smaller 2 1/8" were better until the very end of the range like 6000-6500
Doug

I think I found it with the search:
https://board.moparts.org/ubbthreads/show...rue#Post8275911

572 Wedge, 440-1 345CNC Bracket Engine. Dyno Results
Indy Alum Block
Indy 440-1 345CNC Heads
Indy 440-3X Intake
Quick Fuel 2.125 4500 Carb Re done by Bob Book
HVH 2” Spacer
T&D Single Shaft Rockers 1.6 / 1.6
BMBBR5 Roller Cam 283 on a 115
Jesel Belt Drive
Race Tec Pistons 15 to 1 .043/.043

758 tq at 5700, 939 hp at 7400, TTI Headers 2.125 x 3.5
728 tq at 5900, 946 hp at 7100, 2.125 to 2.375 to 2.500 with a 5" collector