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This is another route to a solution, The thermostat housing holes are all BSPT, and that temp sensor hole isn’t a tapered thread. Many have run NPT taps into a spare hole with a little sealant.

Does your thermostat housing not have a blanked hole next to the standard sensor housing? mine does, its a standard size, m12 maybe.

I'd try and find another upper coolant housing and then figure out what needed to be done to put whatever sensor you need in. zcardepot has them for $43. https://zcardepot.com/products/thermostat-housing-water-outlet-oem-240z?variant=19274718118001&currency=USD&utm_source=google&utm_medium=cpc&utm_campaign=google+shopping&gclid=EAIaIQobChMIsIyr_4aB7wIVgcqGCh17LAGdEAQYAiABEgLX4fD_BwE

Not ready to rock and roll yet, but I did spend part of yesterday sitting without the inflatable pillow!

Thanks for filling in the details. I took a look through my pics and now that I look through them, I'm not sure my bracket has been shortened at all. I've got a pic of an alternator with file marks on the inside of one of the mounting ears. I took the pics, and it was important to me at the time to concentrate on the mounting ears. The implication being two things: 1) It may have been my alternator which was modified, not the bracket, and 2) My memory has reached the point where the details are falling out the bottom. My brain is full.

@AK260 Have you thought about notching out a spot in each blade to clear those bolts. You could dremel out a notch in each blade to clear those stickie outie bolts. That would keep you from installing a spacer so thick that it would hit the radiator. Just a thought. I didn’t install those bolts in my damper.

The Lemon Green 73 is up today. Sold for $40,140. https://bringatrailer.com/listing/1973-datsun-240z-139/

Gradually pull the choke on when it's stumbling. If it improves, the stumbling is from a lean mixture. Was the detonation a backfire out of the carbs? I'd also pull a spark plug to check the color.

Lately i've been purchasing a lot of stuff for the project and related documents and automobilia. Just when i got additionally offered a complete lot of documents from a big collector. Due to covid related delays, the different orders from several weeks and months ended up arriving at my place all within a few days... If you look at the picture below, quite a lot of stuff! Some things just came with the lots, and i will not keep them, even if nice stuff though. Nevertheless, here's what was in my mail yesterday. In the next part of the story, i will show you a huge pile (two cars and a trailer full) of nice parts i picked up yesterday from an old barn... So what was is all that? First a bunch of swiss Datsun memorabilia: including a vintage swiss datsun plastic bag, sales window cards, spare-parts bag, patches, a beer coaster, folders, matchstick boxes, etc... One of the coolest parts here is definitely the 1971 Geneva International Motor show press release folder, including the 240Z and information about the Z beeing shown at their booth. But what is even cooler. The press release states you can order Lithographic master plates from Datsun (Suisse) SA, for your own catalogue production, and it came with one of those lithography master plates. With exactly the same picture as shown in the press release and which is also used in some of the official swiss Z-documentation: Then i found another press release. This time from 1972, about the introduction of the 240Z in switzerland: From germany, i got a set of service manuals and a parts catalogue, which somehow seem to be photocopies of original ones. Not sure exactly who made those, since they're quite good quality and have an "official" feel to them. Maybe Datsun / Nissan germany replicated them themselves? I collected also a bunch of magazines, which include stories of interesting cars that are not your standard Z-car tests: An original swiss 240Z magazine ad (also seen in other countries with the same picture, but different text) Various random Datsun and Z-related magazine tests: A bunch of vintage Z and ZX related parts catalogues (Some of the companies do not exist anymore, or have different names now...) A set of japanese S30 and L-series related Mooks (Magazine books) Including this nice Nostalgic speed motor calendar (Sorry for the blurry photo) A bunch of key holders. Not sure if any of these where officially released by nissan or if all of them are 3rd party stuff. various stickers Sew-on patches and a little C110 Skyline Kenmeri Diecast car: Various User manuals, dealer list and empty document folders from the austrian datsun Import company (which does not exist anymore): Various apparel and a Datsun banner: Japanese nissan chronicles and history books: Which seem very informative, but still have to go through them: The japanese fold-out sales brochure for the Fairlady Z: Some new (re-issued) Tomei vintage stickers: A japanese Fairlady Z Parts catalogue: Random parts and bits for my project: And the cooles part: The "Breadbox" triple mikuni Airboxes, which where used on some of the works rallye cars, and where also optional "competition" equipment. The ones i got are japanese MS Kubo replicas with slightly different locking mechanism. Original ones are rare to find and expensive. And since i'm not even sure if i can install them here street-legally, i decided not to go too crazy about finding original ones. But then i still liked them so much, i had to have them. Here's a picture of the competition parts catalogue, listing the original ones: Stay tuned for the next part of the story, which includes a Barn and loads of stuff. but now i need to sort through all the parts first and take nice pictures 🙂

Any headers part-welded onto the flange have been so done to keep costs down. If you have the opportunity to buy headers with matching ports do so. A 6-1 will work, a 6-2 will work better*.....better still with longer twin secondary pipes joining to 1x at the rear of the gearbox and not before the firewall. All said, of the least expensive headers on the market - the coated MSA 6-2 is the best value : https://www.thezstore.com/page/TZS/PROD/classic19d/15-6001CH Please note that its' 1.5" primary pipes have a much smaller inner diameter than other after-market headers although plenty big enough for a stock or near stock street engine. *for a street engine, what one needs to release is torque, not top-end power. A 6-2 will do this best and torque is what we use for each gear change and acceleration ; ask yourself how frequently you max out the revs to obtain max power ?

I painted only things that I had off to work on. You're going a lot further than I did. I got lucky and found cars with original paint and little rust underneath. I agree with the "get them running good and drive" philosophy.