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I was able to buy an OE molded hose at a local swap meet, so -- even though I bought a length of 9mm (ID) braided hose from Bel-Metric for the purpose -- I never got around to trying out the idea. No reason why it shouldn't work, although you might not be able to make the straight braided hose flex quite enough to match the radius of the bends molded into the OE hose. Unless you're trying to build a concours winner, though, I doubt whether anyone would notice. CORRECTION: I just went down to the workshop and pulled out the hose that I bought from Bel-Metric. It's quite flexible and can be easily bent to match the curves of the molded OE hose... and without any signs of the walls collapsing. It also fits nicely over the nipple of the check valve (the one that fits between the engine-side and mastervac-side hoses). The actual ID of the Bel-Metric hose is 9.4mm, so the best size of copper tubing to use as an insert would be 5/16" OD (7.9mm). 3/8" (9.5mm) tube would be too big and I don't think you'll be able to find 11/32" (8.7mm). In any case, the quality of the fit doesn't matter much because there's no fluid flow happening here. It's just a vacuum hose. The only thing that would cause a problem would be if the hose walls collapsed or got pinched off. It's worth pointing out that the range of aftermarket replacement parts for Series 1 Z's has expanded quite a bit since 2019. Many items that used to be unobtanium (such as this engine-side MasterVac hose) are now quite readily available. Not cheap, though. The hose in question lists at ~ $80.00. That works out to about $100 per foot 😯-- a high price to pay for originality. A 3-ft length of 9mm braided hose from Bel-Metric costs about $15, so $5 per foot.

I am the 2nd owner of this car, I purchased it from the original owner in 1990. In talking to the original owner when I bought the car and a few times since I really doubt that the switch was upgraded/replaced and I know I didn't replace it. Since Datsun did a lot of work to increase production capability in 1970 it seems like that it is entirely possible that there were multiple production lines for the 240Z with lines being stocked with newer parts at different times as needed. Another difference on the interior of my car is my map light is hooded and some other 1970 built 240Z's I've seen the map light has no hood.

At the top of my list is that it does not have the 2400 valve cover. Did they talk about if the engine was original or not? Between the over 100K miles, the carbs, the fan, and the valve cover, I'm thinking not. So it's a historic car, but it would be a huge project. And the biggest hurdle to getting it to top level would be if the engine had been replaced and the original is not available.

It was Yellow when advertised on Craigslist 2017. This is #55381 and #55380 is also Yellow. On a color change, you usually do not see the backside of the pinch welds on the rockers - painted with a new body color. I can see the areas that appear to be white on the undercarriage...where paint appears to have been wore of scuffed off. White Primer maybe?

😝

According to Zhome, 20th is silver and black. So is 19th and 17th. 22nd is blue and black. One of the first things I noticed in the video is that the hood (bonnet) is a later example with the reinforced corners. Makes me wonder.

So it's still not really clear just when the factory made the switch over to the wide-flange 11061-P0300. The fiche indicates either were possible up to 6/72. But the wide-flange 11061-P0300 does NOT have the extra hole @CanTechZ mentions. The housing with the extra hole showed up on the '73 models and is part number 11061-N3300. And it changed again for the L26 is is part number 11061-N3600.

Pretty close to your numbers 26th, interesting to see it is silver and not green.

Maybe not...looks like a colour change from white to lime...I posted the link prior to looking at all of the photos.

I've got to believe that w3wilkes' z switch was replaced/upgraded at some point in history. @w3wilkes How long have you owned your 12/70?

My bad. Still a discontinuity, but I had it in the wrong spot: 16530 has the black - inline6 17486 has the yellow - w3wilkes 17770 has the black - Johnz1971

No-no, I said "My 12/70 (16530) is black. And my 6/71 is orange/yellow."

Might be one to watch Bring a TrailerNo Reserve: 1972 Datsun 240Z 4-SpeedBid for the chance to own a No Reserve: 1972 Datsun 240Z 4-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars online. Lot #197,933.

That's the same as mine, door guards and all. Your paint looks a lot better though as mine has never had a respray. Yours's is my good vs bad comparison.

Thanks for that info CO. 👍

Actually, looking at that thermostat housing you have on your 1/70 is not from 73... It's from couple years later than that. 75 at least. It's got a thermotime switch and temp sensor for the EFI system.

I believe that hole on the 73 was used for the temperature switch for the EGR system. This pic is from 74 260, but 73 had the same thing:

After looking at some '73 240Zs on BaT, and your supporting info, I have to agree that you are correct. Also I noticed that "thick flange" one also has an extra fitting hole on the front, to the left of the temp sensor hole, that does not exist on the early thin flange housing. On my 1/70 that fitting hole has been plugged. Anyone know what it should plumbed to on a '73? Here's a pic of mine, fitting hole circled in red.

One last pic after washing and driving around for a bit. Thanks everyone for the help.

Regarding the LOWER thermostat housing, the conclusion I'm coming to is that indeed, the narrow-flange one is 11061-E3000 and is for 70-72 cars. It seems to have been replaced by the wider/tapered flange 11061-P0300. The micro-fiche seems to support this. Also here is a pic of the early 21K-mile BAT '71 car with the narrow flange housing.

Only 7…. All used, you’re welcome to a decent one

Cool. Seen that hole before on some housings, but never noticed it was threaded. Only ever seen the spark plug holder bracket go under the rear therm housing bolt. Let me see if I have one

I just noticed something related to the early vs later thermostat housing thing. The water outlet that bolts to the top of the housing, also has early and later versions. This pic is of my 1/70 car, with the water outlet from my 7/70 car sitting loose to the left. The early version has an extra tapped hole, circled in red, that I assume is to mount the bracket for the spark plug leads retainer. I noticed this when changing back to my 55 year old OE Yazaki date coded leads. I'm putting these on for car show season. Lol. I also noticed that my early car is missing the bracket that should go into the tapped hole. @zKars would you happen to have one? 🙂 Here's a pic of my 1/70 before I changed the spark plug leads. If you zoom in, you can see the tapped hole and no support bracket. And here is a pic of my 7/70 car before I took it apart for the resto. If you zoom in you can see the bracket, and no extra tapped hole in the water outlet. FYI, my 7/70 car is where the OE spark plug leads came from. Just for fun, here's a pic of my 1/70 (#957) with the 1970 date coded leads. If you zoom in, you can see the markings, sadly they are starting to fade. They do look much better being black. 🙂

(kind of like the consistency of a dried-out hot-dog bun) That is exactly what I have. Thanks for the input.....now to get some bump stops.

I worked with the show host, Tom Cotter, on a number of media events staged by a European manufacturer back in the late 1990's. Nice guy. Very knowledgeable, very enthusiastic, and seemed to know just about everyone in the business. Odd, in hindsight, that I don't remember us ever talking about Datsun and the Z (I had two at the time).