Stage 1 peak HP at 4700? I bet it was either detonating or running out of fuel......or both...or valves floating from tired original springs. I put some .030 shims on valve springs my orig Stage 1 and picked up almost .2 sec. and 2 mph.
I never said HP. I read on the Dyno sheet, the Torque came in at higher than 2800 rpm's. Excuse me for not pointing that out. Vet
Torque came in at 3400 rpm's. I had always read it came in at 2800 rpm's like you said. Over the years, I don't believe everything the factory advertises. Numbers get fudged all the time. Vet