383 rebuild - kinda whimpy on the dyno?

moper said
I would be looking at heads and valvetrain. Which spring and lifter was used? What was the preload? Labor on heads could be suspect. Big valves won’t hurt or kill anything, because the rest of the port just won’t flow anyway. But as cast 906s should move enough air to make 400 hp with that camshaft. So I’d be looking there.

I hear ya. I used COMP Cams High Energy Hydraulic Lifters 822-16. I don’t know about the valve spring pressure, but I’ll try to find out. I forgot to post pics of the invoice details machining and head work, so I’ll add those.