Hi. I was wondering if anyone would have an idea on how much horsepower this engine is making.
1973 GM 350
2 bolt main
bored 30 over
comp cams 256 xtreme energy cam
world sportsman II cast iron heads (72cc chambers)
edelbrock performer intake
edelbrock performer 600 cfm carb
K&N filter

Thank you.

Not really a true guess, but I would say probably little over 350, I could be totally of though.

What kind of fuel? compression ratio?

After looking at the specs on it, the cam is too small.
Lift: .447''/.454''
Duration: 256°/268°
RPM Range: 1000-5200

You have a good set of heads thay are gonna flow alot of air, and .30 overbore which actually makes the motor a 355, but the cam is just to small for the motor. You could also use a slightly bigger carb. As it is, Id say 325 horsepower, and 350ish torque, but that cam is really choking you up. With a better cam, and 650-750 cfm carb, I would put you in the 360-375 horsepower range with around 400 ftlbs of torque.

Rob

I run 91 octane pump gas
comp ratio is around 9.0:1

Rob is pretty close, I would guestimate about 300 horses, 350 lbs torque unless the cam gives it plenty of valve movement you are restricted, as well as the 600 CFM Edelbrock, believe it or not the Rochester (Q-Jet) flowed higher to about 730 CFM.

Ok. Thanks.