The bore and stroke of the engine matter little in where the power is made since it is the cam that ultimately dictates where the power is going to be. The better the head the higher rpm and more powerful the engine will be.
If stroking with a 4 inch are is a limitation to rpm, then please explain why a NHRA 500 cid engine will spin 10K.
Generally speaking, in hot rods and many race car engines, the longer stroke for a bigger engine will have the power leak earlier in the power curve. This is seen with an otherwise apple to apple comparison. An example would be 340 vs a 408. But to use this example as a rule of thumb and to rpm limitations is not wise or in stone.
1; Constant refills with N02 make it a looser in the end. The more you use the more the cost effectiveness drops. How much to fill a bottle by you? How often is a refill?
2; The choices were stroker bottom end or heads. Which of the two would you choose.
