i was looking into this before i went to the 3s...i have seen a 4a head swap on a 7a before but theres a few things that have to be changed....i found this and its pretty much what i would do:
4AGE (16 valve) head
2ZZ (11.25 compression?) pistons and rods
jac knife the crank
CRANE CAMS RPM 2600-6000; Adv. Dur. 292 Int./302 Exh.; Valve Lift .458 Int./.472 Exh.; Lobe Angle 110 deg.;
PACESETTER HEADER
OEM exhaust (less the resonator and cat)
extreme port and polish on the head
HKS valve springs
HKS adjustable cam gears
and a link to my favorite build
http://www.6gc.net/forums/index.php?showtopic=21831
This post has been edited by 95st-celica: Mar 8, 2009 - 3:12 AM