OK my wife has an '03 CR-V and I have an '03 Si.
Since she bought the CR-V i've been contemplating swapping our motors.
Over at ephatch.com someone beat me to it.
He says it was simple, just swap the long block and everything from the K20A3 bolts right up to the K24 (tranny, I/M, Header, wiring harness, etc).

My question is this:

Do you think that the stock K24 will be able to handled the extra revs from my Hondata flash (7800)?
Does anyone know if the K24 head is the same as the K20A3 head (cams, etc)?
Differences?
I was under the impression the only real difference in the longblocks are the displacement (obviously there are other differences in accessories, the intake manifold, etc).
But i noticed my wifes CR-V has a lower redline than my ep.

 

here are some rod/stroke ratios.....good indicator for revving potential

k20 - 86 x 86
k24 - 87 x 99

 

I don't think it will be able to handle it. Stresses build up quickly when revving, and manufacturers spend a lot of money to make sure the motors can last at redline...but they won't design them to last long at faster revs.

Look at the Type R compared to the GSR...redesigned crank, redesigned bearings, special coating on pistons, lightened valves, higher tolerances for rods and other moving parts...and God knws what else. All for 400rpm.

It will last for a little bit because it's fatigue that they design for, not ultimate stresses. But, it won't be nearly as long as the manufacturer intended.