Ok thanks for this @Corkola, I have follow up questions, because I wrote these year-by-year breakdowns in terms of production date, not model year designations.
I am revising the article to show more clearly which series were being built at the beginning of each model year.
I made a change to the SU carb part to show doubt in what historical info I found regarding what year they came out. You are right about the years, so I have changed the singular years headings to show a range in the headings instead. Sorry, should have thought of that beforehand!
My 73 that came with Flat Top Hitachi's was mfg in October 1972 right after the year model change. I did have to replace the differential that had worn out with a slightly later version that only required a later hanger to carry it. All the differentials are not quiet but at least it is in good condition.
Honestly if you would include some type of simple chart regarding the Year series and models would be really helpful I know nothing about that. I also in addition to my 1973 own a 2003 350Z that has had its own host of issues,
First thing is the Flat Tops were new in 1973 (Made by Hitachi) to meet the CA Smog Requirements for an EGR Valve. Early 73 had the Flat tops as well as the late 73 but the Late 73 was a very different car with the Flat Tops and 5 and 3 mile per hour crash bumpers. I took my early 73 and replaced ALL of the intake and Exhaust equipment out of a 72. Many smog issues transpired through the years in CA Smog and then after my wise move to Nevada.
Funny you say that about the 73 74, I bought mine in 1993 for $1,500. When I went to the dealer for some parts the Parts Salesman said "Do you know what is good for the 1973 and 1974? I said, No! He said to crash them into each other and total them both. LOL Like I said above since the block was identically drilled thru I believe 1979 all parts were interchangeable, if you wanted to work that hard, but changing the entire 1973 Intake and Exhaust manifold back to 1972 was one day of labor. And well worth it until CA Smog caught the missing EGR even though it Smogged. The car was sidelined in my garage for 5 years until it was exempt from CA Smog. Then in Nevada to get exempt you have to pass smog once that only took 3 mechanics 2 hours to accomplish, but the car would then not run but it is now Exempt in NV.
Thank you for this.
the old gal just sits mostly in my garage now. I bought another wreck and repaired it myself using spare parts from a donor Z and I drive that car daily during the spring summer and early fall. Sometimes I'll drive the yellow one but it's on non op so not too much. The blue one it seems everyone wants to buy it when ever I gas it up I get a lot of crazy people with some fairly crazy offers. My cars are not for sale at any price.
I never hung an engine in my life or even a transmission, never installed even a clutch but I did this myself and when I couldn't get the mount bolts to line up I called a guy and he told me to use ling number 3 Philips screwdrivers to align the bolt holes. It worked, I mounted the transmission to the motor and used a creeper and an engine hoist, I did it alone in my garage. The car came with a new dash in a cardboard box and I installed all the gauges and controls which I disassembled and rebuilt with parts that I painstakingly researched and purchased from various people and places. I actually refinished the old 240 steering wheel then used steel wool on it to five it that "worn" look.
The fuel injection system was in a box but I wanted to use SU carburetors which were worn out and I couldn't get them into sync so I removed them and sent them to an Z Carb Therapy for overhaul and modification. The brake lines and other parts were full of sand, so was the fuel lines. So I had to flush all that out and I painted and then installed the fuel tank and the filler neck and the other tanks, the old fuel lines were another story. I used 7/8 inch stainless springs inserted into the 1 inch fuel hoses to get them to bend without kinking and did the same with the heater hoses. I filled the tanks then drained them and strained the sand out of the gas and repeated it until i got the tank clean. I layed under the jacked up rear and used my knees to align the fuel tank and installed the mounting straps. Then i bought a battery and fired it up. Imagine my relief when the engine caught and the brake master vacuum allowed the brake pedal to move easily towards the floor and the brake lite shut off. The oil pressure gauge indicated normal and finally the temp gauge started moving towards center. Wow i brought a totally dead s30 back from the grave. I had tried to get the car registered a few years before but the guy at the DMV said no way, come back when it not on a trailer so drove it to the DMV with just a forged bill of sale and it took two gals and finally a supervisor to agree on issuing a title.