The 1255 lb of torque pull was with a 5" pulley on the blower, the 1188 pull, I used a 5.5".both used the 7.65 crank pulley. I wanted to do one pull with race gas and more timing, run it up to 7000 rpm but I ran out of time.

Interesting, seems that at about 5000rpm the belt starts slipping. Which has more area under the curve? Because of the slippage problem, I would use a bigger pully and less boost and extend your rpm range. I would bet that you would be able to go faster with a bigger pully and no slippage.

I agree, when I put the bigger pulley on I gained 171 hp. We didn't run it up high enough to see if the belt slipped again.

Bringing this thread back up.

468CI
Dart alum heads
9:1 static
420 B&M 6psi no chiller.

800 hp fixed it for you.

588 cu in...8.6 static...dart 355 cnc heads...superchiller cooler under 8.3L whipple 13 lbs boost...1200 hp at 6500 and still rising.cam xxx.hyd roller.

Bare 502ci block and an 871/twin 850's . Workin on the rest .

Bringing it back..
496 8.25 to 1
Un ported oval port iron heads.
671 8% overdriven 7psi
29 degrees timing
91 oct
Two 800 edelbrocks
Non intercooled
706hp at 5900

500HP +.030 procharger 6psi @ 5200

add some timing,,32-33° will probably wake it up