cost of headwork varies between how much you get done overall.
I went for an adjustable exhaust cam gear wheel, Tomei 256/256 cams, Tomei 8.8mm valve springs, 87mm x 1.2 Cometic headgasket + all other gaskets, valve guides/seals/etc, $2500 in new parts
plus another $2000 for porting and machine work, installation, rundown testing, tune etc
full potential has been held back, but ready to unleash the beast within
awaiting my GT30r bb-iw turbo right atm, hopefully pickup and start installation this arvo. with that on, serviced with new fluids, redoing/cleaning/heat-wrapping intake/exhaust pipes, will get a tune in a few weeks, expecting a very meaty two-fiddy