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Stolen from Mitchell's Facebook feed. Yikes!

5 long ones on front of cam towers manifold side. 9 everywhere else on the head deck. The turbo bolts will have a small 13 stamped on top of the head of the bolts.

The bolt patterns and centering/locating ring sizes are the same for the 240Z - 280ZX NA cars (non-FS5R90A transmission). Sometimes there is confusion about square versus round flanges but Nissan made both with the same pattern and size for the 280Z's. I have one of each. I also have differentials from 1976 up to 1983. I have a 1983 diff in my 1976 car with 1980 NA transmission right now, with a 1978 propeller shaft.The shape of the flange does NOT indicate the pattern and locating ring size. 300ZX's are different size but came with a square flange also. On the length: the propeller shaft lengths are shown in the PD (Propeller shaft and differential) chapters of the FSM's. I'd use those numbers over anybody's well-intentioned efforts with a tape measure. But for the cost of shortening a 280ZX propeller shaft you could probably find a 280Z shaft somewhere. Maybe even two or three. They last a long time.

I have an '81 5 speed and my stock shaft bolted right up so you should be good.

Good find on the thread Cliff. Those notches look familiar. They look prettier than mine. Not sure I would worry about performance losses associated with notching, but oversizing ports for sure.

I didn't understand why I should take hot showers in the middle of the night but I do now! My shower will need Rotor-Rootering now for all the phlegm. You're advice is spot on, as usual.

cool! love those wheels...

The new garages! Life is good... Sent from Canadia