My early 1974 260Z was recently run on a chassis dyno to tune the Mikuni 40PHH carbs. The tuning is not complete. But, so far, 139 bHP and 143 ft lbs have been measured at the rear wheels. Based on the following drive train description, what are realistic performance expectations?
Thanks
Drive Train Description
Production date: April 1974
Air box: K&N Lamborghini 3-carb filter in Jim Wolf Racing aluminum housing with Mikuni air horns
Alternator: 60 amp
Camshaft: Racer Brown SS-54-110 – 236 degree duration at 0.025” lift with 0 lash, 110 degree lobe centers, and 0.480” lift net, and valve spring/retainer package
Carburetion: Mikuni triple side draft, 40PHH with 32mm chokes
Cylinder head: Decked 0.020”
Bronze valve guides
280Z intake valves, 0.173” dia.
280Z exhaust valves
Valves and seats grinded
Built by Floyd Link, Torrance, CA
Exhaust: Custom fabricated with flanged connections
Header: Euro Car Anti-Reversionary, 1 ½” dia. tubing, 3 into 2, 2 ¼” dia. collector outlet
System Dia.: 2 ¼”
Resonator: Borla resonator
Muffler: Borla turbo muffler
Fuel rail: Custom fabricated to duplicate functions of the original system using original brackets
Ignition: New stock coil
New stock distributor
Taylor 8mm Spiro-Pro
NGK Iridium spark plugs
Oil pump: ZX-Turbo unit
Pistons: Datsun 0.040” over, flat top
Differential: R180 limited slip, 3.545 R&P set, Bob Sharp Racing spare
Transmission: New 1978 280Z 5-speed