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From the 4 inch throw small block posts on here over the years It seems that the smaller cid 408 to 416 with good heads 300cfm to 330cfm make peek power around 6500 to 6800 with cams in the 260 to 270 @.050 range.... There really are too many variables for a rule approach



Well my cam is 276 @ .050 and I need it to turn 7000-7200. I don't think that will be a problem.

I would think with 276 on the intake low 7s would be easy, Are you gona advance it 4*



Actually it should have been in at 108 but I had to move it to 104 to get valve to piston clearance.

.... you run that much exhaust duration & lift... Must be a nitrous engine



The exh is 284 @ .050 with .714 net lift. Not a nitrous engine, but it does have a TR and 2 750 Demons. It's a SS grind I got from a SS racer friend that only had about 20 dyno pulls on it. He said they made 650HP with it but they were still looking for another 30 HP. I don't know what they were twisting it to but I'm sure it was over 8000.

How did the new engine work out? Did it pull as you expected?