okay, so i've got an obd1 sohc zc vtec in my civic that originally came with a z6. i know the cam's are differance between the two, and read that the pistons are differant between the two (p28 pistons in z6 and p08 pistons in zcvtec) and they use differant ecu's(p28 vs p08). now my question is, does anyone know that these are infact true differances? and wouldnt swapping p08 pistons for p28 pistons raise my compression? also, whats the differance between p28 ecu's and p08 ecus? differant cam/ignition timing? differant a/f? differant vtec x-over?