Quote Originally Posted by aaronng View Post
Your rods/pistons won't disco dance in the block, the valves won't float, but it still doesn't solve the high piston speed at 8400rpm If you are changing the rods, you can destroke instead (Prototype Racing in the US had a k24a running at 2.3L). Not sure which crank they used, could have been an f23's, but I think I'm mistaken as the bore-to-bore distances for both engines should be different.
You're right, a K24 running a '04 S2K crank (with a deckplate or custom rods) will destroke it to 2.3L. It will produce lower piston speeds and a good rod/stroke ratio that will let you rev the crap out of it. Bore to bore distances should be the same for both motors, RSRs drift S2K is stroked using a K24 crank, and H22 pistons and rods to produce a 2.4L.