Interesting stuff.
Toyota vehicles were in production long before WWII, during the 1930’s it was producing lots of large trucks for the Military. Also lots of the factories were converted to aircraft production.
Post War, Occupation forces wanted to make sure the factories had something other than Military Trucks and Aircraft to produce! MacArther, smart man, let them build up their economy. Automobile production was ideal, but most of the original automobile production tooling were destroyed during WWII.
Toyota started producing “Chevy” vehicles with an agreement from Chevrolet. Datsun (aka Nissan Motor Company) went with Austin (British) Motor Company as a partner. Originally the vehicles were shipped over in crates, and just “bolted together”. Slowly other companies became involved with the production of the subcomponents, until almost 100% was Japanese content.
Also during this time was the decision to have a locally produced "Jeep". So it was a Jeep Body, with Chevy running gear! So yes the “chevy six” was the basis for the original motor, hence why a SM420 would bolt up to it.
Starting around 1960, MITI (Ministry of Industry an Trade) told Toyota and Datsun NOT to compete against each other in the USA market. Toyota got the Land Cruiser; Datsun went with the Spots Car. Remember the Nissan Patrol suddenly disappeared from the USA market (still available in Canada) and the neat Toyota Sports Car was no longer. So we got the Land Cruiser and the 240Z a few years later. Both did pretty good!
As to the Metric bolts: Post WWII Japan was all AMERICAN THREAD! MITI forced the conversion to Metric hardware starting in 1967. Items DESIGNED after that date had to use metric fasteners, but if something was in production it could continue with the SAE Hardware sizes. Lots of companies used different metric standards, so ISO standards were adopted starting with the 1968 designs. For the Old Datsun’s I’ve used my lathe to custom make some odd threaded fasteners at times.
For other Trivia: Russian Built Fords! Read an intersting book years back about the number of American families who got trapped in Russia after the red's came to power. Anyone remember the title of that book?
Tom :usa: