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

4 hours ago, Chickenman said:

Ah yes.... fond memories. I wonder what cute little Gina is doing now?

Though I didn't mention her by name, are we talking about the same Gina?

On ‎2‎/‎4‎/‎2016 at 5:07 PM, Lumens said:

I have that exact camshaft. I told Racer I wanted an autocross cam and that is what he ground for me.

How did that cam work out for you?

1 hour ago, fixitman said:

Though I didn't mention her by name, are we talking about the same Gina?

I think we all knew a cute little Italian girl named Gina at one point in our lives... sigh.    Just a coincidence...

19 hours ago, fixitman said:

How did that cam work out for you?

That was a real good cam for my 72 L24 engine with just stock headwork.

I also had an aftermarket lightweight flywheel and a 4:11 Limited Slip.

No big horsepower change but was really fun on the street.

I have a L28 in it now.

That L24 motor is out of the car and is getting rebuilt with .020 over bore.

This is the original numbers matching engine and I will reinstall it when I sell the car.

(one of these days)

 

For what it's worth there are many of these 123ignitions being used in race applications w/o interruption. Here are a couple of links.

http://pandbmotorsports.blogspot.com/

http://www.corinthianvintagerace.com/