ok ka24e is the single cam motor and the dual cam is the ka24de. unless you are planning on doing a swap i would try to hold out and find a dohc. my expeience has shown the dohc being stronger. the sr motor isnt garbage at all. i prefer the ka over the sr but i have seen many more fast sr's than ka's. Its obvious you are new to the 240 scene but with a little research and some unwanted experience in fixing them you will know what you're talking about soon enough... not to dog on you friends or anything but they dont seem to know what they are talking about saying the sr is garbage and the sohc is better because it doesnt bog down like the dohc..... you should know that is bull

whatever im just rambling on... so my opinion! DOHC>SOHC