Zed Head

It might the mark of Paraut. Apparently they were the OEM supplier for Atsugi (or vice-versa). Who supplied Nissan and maybe still does. I had another thread on Hybridz about rocker arms and one of the guys over there seemed to know quite a bit. Xnke. http://www.elautoparts.com/item.wws?sku=A4040-51981&itempk=86615&mfr=Paraut&weight=0.20

That's why some squirts would have been neato. It would have shown. Oh well. I often wish I'd taken pictures of things but when I'm doing them I'm just too focused on getting the job done.

Don't overlook those other rotors, used for swaps. The 280Z rear discs, and Toyota truck. Maybe somebody had an "upgrade" planned.

Did you power them up and give a few squirts? Just to know if the other caps were a problem.

There's a different set of stripes that Nissan used on their ZZZAP model. Never seen yours. http://zhome.com/History/ZZZapZ.htm That looks aftermarket. I had a friend who bought a new 1977 Celica and had stripes painted on to the new car's paint. It was a thing back then.

Edited - there are crazy people out there.

My spare 280Z discs measure a hair under 1 1/2" from the rotor surface to the top of the hat. Might help.

Here's a picture I took in the past. I'm 99% sure it came from my 1976 cylinder head, which I'm 99% sure is completely factory original. The two sides are different.

You should just install that open diff, clip the CV axles in and run it for a while. The LSD is nice but you won't really get the benefits unless you're up at 9/10ths, or driving in the wet, or dirt. The IRS of the Z's really locks the individual tires down. People report spinning two tires more often then not, with open diffs. The CV axles were used on turbo and 2+2 280ZX's. Generally thought to be stronger or at least more durable than u-joint half shafts. Maybe smoother too. Your only issue might be gearing, to match your transmission.

Here's the short axles. No grooves in the splined section like ours. Not really sure how they're held in unless they moved the clip grooves out off of the splines. to where you had put your clips.

No. You're right it's an engine mount. Bad text in the eBay ad. The part number is for an engine mount. The eBay listing shows 70-73 240Z, but an engine mount should fit all S30's. So that eBay listing is completely screwed up, sorry for the misdirection. So many ways to go wrong on internet sales. OReilly 104-0828 - http://www.oreillyauto.com/site/c/detail/BA00/1040828/02327.oap?year=1983&make=Nissan&model=280ZX&vi=1209406&ck=Search_02327_1209406_-1&pt=02327&ppt=C0019#compatibilityTab_ I bought the type that looks like yours but must have a different bolt pattern. Good luck.

Here's my latest guess - somebody transplanted a CLSD from the front axle of a 4x4. Looks like they had a variant of the R200 with a side tube to hold the axle. No need for clips. http://www.nissanpathfinders.net/forum/topic/40656-r200a-vs-r200awhats-the-diff/ I found it while searching for "R200 side gears", which came up with a bunch of stuff. Maybe you can swap those side gears. Worth searching. Otherwise, I think you're kind of screwed. It looks like one side of these might use a clip though, but who knows what other variations are out there. You might take it to a local 4x4 shop. Those guys break so much stuff that they know their diffs inside and out.

@SteveJ

240Z world. I wonder if one's an automatic mount and everyone is using the same stock photo. Or maybe they had to switch when Photobucket screwed them over. Autoplicity's picture seems right. http://www.ebay.com/itm/Beck-Arnly-104-0828-Motor-and-Transmission-Mount-/361572098485?fits=Make%3ADatsun|Model%3A240Z&epid=76417723&hash=item542f6061b5:g:sE0AAOSwEzxYZ0s5&vxp=mtr

That's not the one I got. You could go to the store and check it out. The internet makes us all forget about the old days of walking into the store and looking at a part to see if it's right.. But eBay works too. Sometimes I check the local weather at my computer when all I need to do is get up and go open the door...

Nissan calls that mount the rear engine mount. It's the only thing that keeps the engine from titling forward when you hit the brakes. I replaced mine with an Auitozone Duralast brand. It made the shift lever feel more solid. Definitely raised the back of the engine too, probably stopping some driveline vibration. I've never seen a urethane replacement for that one, although there are replacements for the outer ones on the 280Z. You don't have those on the 240Z.

Gawdammm... I was inspired to crank up my ancient 200 disc CD player and search out that old album. I have the vinyl but no turntable. I've heard that cassette tapes are making a comeback. I'll bet there's a play here to sell to one of the big boys. http://www.bbc.com/news/technology-40492668

My discerning abilities are incredible...

I'm thinking about making tools in my backyard, labeling them as Made in China on them and selling them on eBay. I think there's a market. No refunds.

But you probably paid $5 at Harbor Freight for that, right? That's the heart of the problem.

Interesting. Maybe there's a diff that uses bolt-in axles like those for an R180 that will swap in to an R200 carrier. Are those holes in the center piece threaded? I asked that earlier when I thought it might be an R180. If they're threaded, the threads would have had a purpose. Edit - never mind, I see that that's just the end of the other axle. Weird thing that you have there.

Good luck with that. At least you have a "first place to look" next time.

China and USA both bad? Can we get Made in Canada? Where do we turn? Oh god, the path down is getting so steep... Edit - wait a minute. I thought Canada was frontier, where people made their own tools? Fire up that forge!

How long are you letting it idle? Not clear if it's idling for ten minutes or ten seconds. Could be that the new fuel pump doesn't actually have power and the engine is just starting on residual fuel.

Shouldn't be a problem. Can you get some vise-grips on the heads instead? Might be able to break them loose that way. Once they break loose a screwdriver might work.