thanks everybody. I was hoping to get atleast 400 hp out of my 401. With a edelbrock intake and two 600 carbs,headers,2 1/2 exhaust, msd distributor and box. What do you guys think?
There were a few dyno results posted on V8Buick in the past year. Even builds with small-stem valves and port work could not break the 400 hp barrier. 350 to 385 hp is where they generally dyno. The problem is, the horsepower maxes out at 4800 rpm or so. The heads simply do not flow enough air to let the engine make good power at higher rpm's.
Don't worry too much about the numbers. Nailheads have lots of low-end torque and that makes them great street engines!
For strip use, mid 13's are possible.
A reliable source tells us that Edelbrock has at least two designs for aluminum Nailhead heads in development. Only time will tell if they actually make it to production.