Stroker physics - where the differences are?

The only thing I can add is that the piston speed has both bonuses and caveats. On the up side, Kid mentioned the timing and "suction" deals. But there's also mechanical leverage from the longer crank throw. These all come into play at relatively low rpm. Meaning it's torque that is boosted by these bonuses. The caveats are: The piston speeds place a much higher stress (exponential) on the rods and pistons so materials and choices and rpm limits become more important. The ports reach choke faster because there is only so fast a port can flow before it runs into issues and stops flowing more. The added mechanical leverage also means there is more friction on the cylinder walls and piston skirts and more liklihood of the walls crackign under the added stress. The isues mostly affect the higher rpm levels where friction becomes a big deal and the larger support parts are required to maintain the power level. (Carb, heads, headers)