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Wintergreen will revive rubber. Resistance is resistance, it has no direction... so from an electronics point of view the connections don't matter... but from a safety point of view, the higher voltage path may be optimized for safety (e.g. more distance from potential shorts/sparks, smaller connector lugs to prevent shorts/sparks, etc.). It is well worth the effort to get it correct. Edit: Ok I rechecked and +pos sender terminal is insulated so you need to ensure the voltage goes to the sender terminal. Disconnect battery if working on this device near gas.

I agree for sure.... but I did see some early Nissan document that shows "Series 1" on one of the inner title pages so Series 2/3/ Ad nauseam may stem from that. As the TSB's show, the whole production path was towards improvements or required changes as needed or as convenient. Your few descriptors are perfect.

Fair enough. Thanks for clarifying. I agree that much clarity is needed (take some of the Goertz myths). You and Kats have helped greatly with your knowledge, enthusiasm and resources.... BIG THANKS.

No worries. I love and respect them both ? Actually I don't like the fact that Nissan did not move the LY crossflow head into the main product. I guess the bean counters in Nissan just wanted to turn the crank and keep the production moving with minimal fuss. My issue with this thread is all of the unnecessary Mr. K. bashing... one grows weary of the seeming agenda.

Masahiro HASEMI in 1970 Nissan Skyline 2000 GT-R. He talks about Skyline being stiffer and the L24 being the better off-line "weapon" here: http://vital.sakura.ne.jp/NISSAN SKYLINE KGC10 HP/S30kei.html Here he is in a Skyline battling the first L24 racer. He finished in 2nd.

The same racer that preferred the L24 for racing over S20 also preferred the skyline over the 432R for its stiffness. Light may not always be better.

Did you see @gundee's post above in this thread... a 72 240z with ~ 2,600 miles..... Way more NOS.... $410k ?

Thanks ! It will be a dream. I will take you up on this the next time I am in Japan. My only connections to the 432 is a mirror I picked up on Ebay and a 432R toy car I just got in the mail last night ?

In post war Japan Nissan only gained a serious interest in racing AFTER a privateer won a race in mid 1963. Likewise the acquisition of Prince also raised the racing bar in Nissan when it merged with Nissan in mid 1966 however Nissan USA with Mr K was actively supporting racing since 1960. (Bob Sharp started with Nissan in 1964). USA was heading the Nissan racing effort!

For documentation of HP and torque specification, we would be better off looking at what we know from history: The L24's torque when racing off line made it better for racing than then S20. The S20 was better for maintaining a higher-end speed when lapping with no one on the track. This was stated by a racer who had the privilege to race both cars in Japan 1970. These are from race prepped engines. However this seems very reasonable as the larger displacement of 2.4 vs 2.0 will give more torque, and the extra valves and crossflow of the 2.0 head will breath better at high rpms. There is an excellent thread showing that the L24 beat many S20 fitted cars on its first racing outing. The fact the USA market also got the 260z and 280z shows that Nissan was addressing the HP/Torque addition of drivers there ? But still I would rather have Dimwit #1's BMW fitted Z ? @grannyknot for the extra torque and HP!

There was a great effort at Nissan to comply with USA safety requirements when developing the 240z long before production. It is documented in many books and quoted by many involved in the development. The big challenge to Nissan in the mid to late 60's was the USA roll-over requirement as their big sports car seller was the Datsun 2 seater convertable sold to the USA market. The fitting of roll bars early in the Z program seem to show the significance in making the Z compatible with USA safety requirements right from the start. Other items such as lowering the floor to accommodate taller drivers, the smog kit mentioned above, etc. are all specific design changes/adaptations for the USA market. To go back to the thought of the smog pump preventing the planned AC being fitted, it would be interesting to see the USA pollution regulation change dates and if they align with the smog pump's development. Perhaps @Carl Beck may have some insight on this. *Very* early Z LHD with roll bar fitted

It is most likely that the USA requirement for emissions caused the planned 1969 AC in that location to be replaced by the smog pump. This would have mooted the AC location quite quickly. My 77 with EFI (and no smog pump) has similar AC hose routing and similar compressor location as the 1969. Here is the same 1969 locations feeding the AC in a USA 280z

https://www.foxnews.com/auto/1971-datsun-240z-sold-310000

I've seen the SCCN for Nippon but there seems to be an SCCJ as well. Is it the same?

I've seen it on a few consoles. Usually the very thin plastic was cracked and seemed like those delicate Christmas ornaments with the sunken "eye". Nice that you explained what it was. Thanks!

Show me a photo of Mr Kawazoe racing a car please. Mr Katayama raced car #36 in 1952.

Well Katayama did a heck of a lot prior to the Z so one can easily see how he had the experience and skills to help move the project in the right direction. This is amplified by his love of auto racing He conceived and supported a car design through to manufacturing in the 40's at Nissan http://zhome.com/History/FlyingFeather.htm He hung out with stationed Americans and chaired the start of the SCCN (Japan's equivalent to the SCCA) ~1950 Conceived, organized, and executed the first Tokyo Motor Show 1954. He got Nissan back into racing (post war Australian Rally) and won 1958! He witnessed the post war car boom and sports car boom in the USA . He sold the first Nissan sports cars in the USA 1960 A gazillion other major and minor items. He was capable, knew sports cars, knew Americans and America, knew Japan and corporate Japan. There is no reason to think his roll in the S30 was not significant. I don't think one can find another such individual in Nissan or even Japan at the time. SCCJ Publication, Vol.1.No.1 April 1952 Racing in Japan....yup that is Mr K with the racing goggles.

Looks mint! Put it on BAT.... strike while the iron is hot!

Beta buyer for Jay Leno?

TBI!!!! That will bring power and sound great!

Or you could buy 0.375 of a 432R :

2 hours left $110K

2.5 Hours left $104K