the only reason 4efte's are lower compression is because of the pistons used, the 4efte pistons a 'dished' and the 4efe pistons are the highest compression standard piston you can put in this engine. the only difference between the 2, are the valve springs, pistons (rods between the older model) the holes for the oil filter relocation, the sump and oil pick up and the thermo/rad pipe housing bit you can skim the head ever so slightly, and/or just use a thinner headgasket as for cams the 5efhe cams are the only 'standard' cams that will fit, they are rare as rocking horse shit, but they arent expensive or hard to come by if your looking in the right places. infact i bought a set for my old n/a, but never got around to fitting them. i paid £50 for them (and it wasnt through contacts, just knowing where to look) if you look through my old build thread called tommy toyota, ive got a list on around page 25 ish which is everything i had done/had planned most important would be the ecu side of things which i never got around too. the 4efe ecu shits itself at around 95bhp (if you can get that far) ryan