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Carburetor Conundrum (260Z)

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It may be possible to repair the vacuum port that had the nail in it, with an appropriately sized brass tube. Use a tube that is slightly too big, and turn it down, then press it in.

Not sure what to do about those cobbled up throttle shafts with the “inject grease here” scratched into the flanges. Perhaps the place in Oregon, Z Therapy could repair them. They have a ball bearing upgrade for the SU carb.


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I wouldn't worry about the grease holes. They'll be sealed up by the gasket on the mounting face. And if you don't tell anyone about them, nobody will ever know.   :ph34r:

And about that hole for the ported vacuum... If one were to assume that the previous owner drilled the original vacuum nipple out of the carb body, and did it "concentric to the original center of the hole", then one could make an insert with the appropriate diameter small hole through it*. Press or loctite it in place and very carefully file the inside flush with the curved surface of the carb throat.

I could do it. At least if the center line of the enlarged hole is in the same location as the center line of the original port hole. If they ham handed the removal of the original tube and drilled off center or something, then the location of the new port will be mis-located accordingly.


* Or get extremely lucky and find some piece of tubing off the shelf that already has the correct ID and OD. Extremely lucky....   LOL

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On 7/7/2022 at 10:45 AM, DadAndLadZ said:I have not actually checked the fuel pressure and not sure how to do that?

Sorry, I meant to comment on this earlier.

A good quality gauge and a proper fuel pressure regulator.

The red Holley fuel pressure regulator works well, and has two outlets, or to go to the carbs, the other where a gauge can be connected.

The SU carbs don’t require much fuel pressure, under 4psi if memory serves me.

A picture of the setup on my race Z:





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