I figured a worked ca18de head to put out 180hp would probably need at least 5000 aud of port work, solid lifter conversion, lighter retainers, better springs, lighter valves, camshafts, induction/exhaust, pistons, crank and rod work.

This bike head comes with all it needs for 180hp add R1 semi-Downdraft carbs and
Megajolt ignition. Use ZX12R 83mm stock pistons and worked ca18de conrods.

Thanks for the tip, Ill go to Motorcycle wreckers soon to see whats possible.

I could get billet twin plate clutch/flywheel combos from Okinawa for peanuts
at least and bring a cheap head from there on my next trip as locally they
are very expensive wheres also the US are cheap but post the killer.
zx12r ebay item