Zed Head

What color is it? Do you have a meter or test light? See if it has power. Automatic or manual transmission?

L Looks scary. Interesting experiment.

Or not on the base circle. Not sure which cylinder it is. p.s. just saw Jeff Berks reply... Question answered.

The hole position varies. They just drill in a straight line for some, then another straight line for the others, I think. Those lobes would be for the same cylinder. That looks like a very wide lobe separation angle if that chip is at the top of the lobe. I'd keep an ear on it, then an eye. http://datnissparts.com/new-oe-l6-camshaft-datsun-240z-260z-280z-l24-l26-l28-13001-e4182/

I don't see any holes in the three cam lobes you showed. The internally oiled cams have those to let the oil out. Why does he say "new cam" when it looks like you got a used one? That chip might work but it could also self-destruct rapidly. Looks like the chip is on the base circle though, where there should be almost no pressure. Only the anti-rattle springs pressing on it.

Ruined 71 with Bluetooth. https://bringatrailer.com/listing/1971-datsun-240z-178/

I use an awl, a wood screw, and vise-grips.

You can buy them at any auto parts store. No need to wait for delivery, just get them when you need them.

You're going to have to give a better description than "no click stop when I flick it with my finger". Make a video.

https://www.classiczcars.com/forums/topic/53344-drivers-side-door-locking-mechanism/?tab=comments#comment-623584

Since the thread quality isn't an indicator of the quality of the potential failure point your worry level should be the same. Your "new" used axle is just as likely to fail as your old used axle.

77 survivor. Going counter on the main picture, pointed right. Rebel. https://bringatrailer.com/listing/1977-datsun-280z-50/

Quiz him on what was good about it and what he would have changed if he still had it. Then go find one like that.

The diff mount seems to be sitting high. Look up in this hole and see if there is a nut on the threaded stud. Stole from Namerow.