is it possible ???
 

i have an ls and im wondering if i could put a k20a3 head on the ls block the k20a3 is off a 02 civic si i dont think it can be done but if it can im doing it let me know please someone....:confused:

You might be able to do it with enough time or money, but then you could have bought the whole K-series motor.

If you want VTEC for your LS you should stick with a B-series head.