My compromise given the choices of the Skyline heads E31, the P90 ex series 2 dattos and the N42 is to use an N42 ex 1978 Fairlady 280z and its associated inlet system, with a dual throat throttle body and a start injector and in the exhaust system an O2 sensor (yes O2 sensor) the appropriate Fairlady 280z showa protocol ecu, coupled to the rear exhaust gas temp gauge and a rebuilt F54 bottom end running 1 mm o/s pistons dished, Crane 53846 cam. I also threw out the power steering and air-conditoner pumps and the 25 kg hamrmonic balancer in favour of one from a 180B, and then fitted the non-powered rack from the 1978 Fairlady 280z result 8.8:1 200 hp no power draining accessories from 2850cc. I also run on LPG and with a 3.7:1 rear and a 5 speed manual gearbox, turn in 300 kM for $15 worth of LPG which I can afford unlike the current $100+ to fill the gas guzzling fuel tank with premium unleaded.
The final drive turns in 2600 rpm at 100 kph.
