I was always under the assumption these were from a 72, but I am unsure if the previous owner changed them out or not. I cant really make out the stamping on the side it looks like it says HJG46 W-F3 but I am kind of guessing, especially on the W-F3 part. It has a clicky type adjuster on the bottom and not the turn style knob. 3 screw on top and the round throat.

72 3 screw SU. Wade, have you checked the damper oil, you mentioned that the car was running funky and blowing smoke after adjusting your needles. could be that youre burning damper oil.

Ok cool, this style of adjuster only has 5 slots and is not the knob style I usually see write ups about on adjusting, I take it it is the same concept just less fine tuning available. As in most info says turn knob in all the way clockwise and then turn it out so many turns.

I should of just put this on the other thread I got going but just needed to confirm the carbs.

Edited December 18, 201113 yr by Wade

I just looked at the knobs on my set of 72 SU's and it is different than yours, which leads me to believe that yours are an earlier generation. They are 3 screws, identical to mine in every other way, I’m sure someone will jump in and give the exact info on them.

Mixture knobs on my "late" 72 are cylindrical with straight knurls.

Yours look like they would be easier to turn when you have your forearm bent in two places to get at the back one...

Oiluj, when you say cylindrical with straight knurls are you talking about the plastic black knob looking type? Im just trying to get an idea of when this style I got was used and figure if whether or not these ones I have were ever changed. 6/72 was the production date from the Z these carbs came from. This guy on ebay has the same style on his rebuild http://www.ebay.com/itm/Datsun-240Z-260Z-280Z-SU-Hitachi-Carb-Intake-Assy-Rebuilt-Restored-Warranty-/290646370116?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item43abdfa744 (I sure wish I had the funds to just buy it!) and from what I have heard the 72's nozzles and adjusters are no longer available so I was thinking these adjusters actually came from the earlier series Z's.

The cylindrical knob looks kind of like a radio volume knob, made of metal, with bearings pressed into the side at 12 and 6 oclock.

Oiluj, when you say cylindrical with straight knurls are you talking about the plastic black knob looking type? Im just trying to get an idea of when this style I got was used and figure if whether or not these ones I have were ever changed. 6/72 was the production date from the Z these carbs came from. This guy on ebay has the same style on his rebuild http://www.ebay.com/itm/Datsun-240Z-260Z-280Z-SU-Hitachi-Carb-Intake-Assy-Rebuilt-Restored-Warranty-/290646370116?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item43abdfa744 (I sure wish I had the funds to just buy it!) and from what I have heard the 72's nozzles and adjusters are no longer available so I was thinking these adjusters actually came from the earlier series Z's.

That notched adjuster was the latest in the series and I'm sure was implemented to keep owners from doing wild and crazy adjustemments to the mixture.

IF you need more adjustment than the notches will allow just bend that sprng clip out of the way and adjust to whee you need it and bend it back into the first available notch. Nozzles are standard to all 3 & 4 screw Hitachis and we have them.

Ok, sounds good, thanks for your guys responses.

I just sent a set of those to ZsOndaBrain (aka Dave Irwin) besides if Bruce doesn't know no one does. There is a thread in this forum addressing that type of SU.