Leaderboard

Yes, from the contact surface on the ear. Others have determined the same 92mm number, EuroDat among them I believe. There's a thread out there somewhere.

Ack. So many parts and so many possibilities. Best to remember that the throwout bearing collar height is designed to match the height of the levers it sits on in the pressure plate. Collar and pressure plate are a matched set. 92 mm (+/- an mm) from the surface of the flywheel to the surface that the fork tines ride on is the key dimension. If you have that number you will most likely be okay. I will never install a transmission again without confirming that measurement. Attached a picture, not perfect but I think it illustrates. Edit - almost had the perfect post but had times instead of tines. Carp.

This might be side tracking the thread a litle bit. Site, your clutch fork with the hole is a pre July 1972 clutch fork. It goes with the adjustable slave cylinder push rod and return spring. Back in the early days manufacturers didn't won't the clutch release bearing running all the time. It remains stationary until the clutch pedal is depressed. Maybe because of the high speeds involved and low temperature grease. I have heard people say low quality bearings, but I think that is a fable. The low temperature grease getting overheated and not lubricating the bearing seems more feasable. Remember this bearing is running three times as fast as the wheel bearing. A lot of people refer to the collar by the transmission, but that can be misleading. Its better to go by the year. Datsun changed the pressure plate the same time they changed the 71A to the 71B transmission. After that its all over the place. You can get a 71B 4 speed with thre different collars, just depends if its in a 240Z, 280Z or a 2+2. The to drawing below show how you can get confused by using the transmission to determine collar height. The second drawing show the same, but per model Zed.

Ah, Memories of Zs and dogs. When I introduced my puppy Max (Springer Spaniel) to my 71 Z and went for a ride, he promptly got sick and filled the console tray to overflowing status. First and only time. His way of christening it I guess. From then on it was 16 years of clear sailing.