So I haven't found a direct answer.
Recently my k24z7 motor died on me, two cylinders aren't working from the sound and the appearance of the spark plugs.
I fear that my cylinder walls are damaged. Hopefully they aren't.
If they are I think my cheapest route would be to bore out the cylinders...
My friend has it on authority from a source close to Honda that the only difference between the new K24Z7 engine in the Si and the K24Z3 found in the TSX/Accord is the block casting.
Everything else on and inside the motor is the same:
Valve springs / retainers...