I have seen the lump ports everyone always talks about and do understand why they install them, but if you look at the whole port over all, the bolt boss isn't hurting the head at the rpm the engine was intended to run at. Sure the port opening is small going around the boss, but there are two of them per cylinder. By that I mean each cylinder can draw from both sides of the boss, and since the intake has only one runner per pair of cylinders, there is no torque lost or gained by the boss in the middle of the road, it actually splits the air flow directing it towards each cylinder. The real problem with the head is the floor of the port is to low and there is no room for the air to turn down into the cylinder. The air shoots straight across the valve blocking the other side. Lump ports raise the floor up and give the port a half decent short turn radius the air can follow, the down side is you open the whole port up bigger just to install them thus loosing the velocity. The good running 292 run at high rpm, 250 go even higher, just look at what the Australians have done with the 250's.
