What is the proper lenght z bar for a 68 barracuda slant six car?

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I'm human and I do things for the universe.

Don't have one sitting around to measure. My guess is that 67-newer would be longer than 66-older, only because the engine bay is wider. Have no idea if that suggestion will help you.

Let's verify that you're talking about the torque shaft in the clutch linkage, yes? Although I've never heard anything else being referred to as a z-bar, but ya never know.

It doesn't seem like it would be that hard to figure out, so I must be missing some key piece of information. The torque shaft is held in place with a nylon bushing in each end, into which a ball stud is inserted (for the pivot), each ball stud being attached to a triangular bracket. One bracket bolts to the frame rail, the other to the engine/transmission housing... in which case, it ought to be a simple matter of measuring the distance between those two mounting points, especially if you have the brackets and ball studs.

Not sure how else to help you, without knowing a few more details of what you're trying to accomplish and why it seems puzzling (you must be trying to convert an auto to a manual?)

For what it's worth, either the old torque shafts are fairly notorious for metal fatigue, as the arms break the tube at the weld joint, or else I've had particularly bad luck on two different vehicles that needed a weld job to reinforce the tube/joint. Those were each light-duty slant six clutches, so we're not even talking about a high-force pressure plate. Until I saw it happen, I wouldn't have considered a solid piece of metal linkage to be a wear item.

- Erik

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Lots of early Valiants and Barracudas have crossed my path.
Also a handful of other toys for variety now and then.