Quote Originally Posted by bal View Post
with upgraded valvetrain (lets say JDM k20a) and upgraded conrods and rod bolts still using the stock pistons etc in the k24a will this help the motor handle the higher revs?
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.