http://www.thezstore.com/page/TZS/PROD/classic16d/15-6211

Is listed for 71 - 72 cars. The same part for 70 cars is no longer available. My car is titled & registered as a 71, but was built 12/70. The parts appear to be the same, what's the difference and what serial # car would the 71 - 72 part start at?

It may be the PCV valve location.  On my '72 it's in the center of the balance tube between the carbs.  Zcardepot list the same hose from '70 through '74?

https://zcardepot.com/crankcase-pcv-vent-hose-oem-70-74.html

The PCV valve on my car is also in the center of the balance tube.

Interesting that ZCarDepot lists 1 hose for 70 - 74, but MSA lists a hose separate for 70 that's NLA and then a hose for 71 - 72 that is available and NLA for 73 - 74. Maybe ZCarDepot's hose fits more cars because they charge twice as much for the hose than MSA! 

Try "240zrubberparts.com" or something like that. The guy is a member on here, super nice too. He reproduces NLA parts.

The Nissan parts book shows four part numbers for the PCV hose (item 3) from 1970 to 1973. I'm not sure what the differences are but the first P/N shows for up to 12'70 and the part number starting 1'71 not being backwards compatible. Also here is a picture of my  7'70 car showing the early hose.

HTH

Mike

 

Edited September 4, 20179 yr by CanTechZ

Thanks, looks just like my 12/70 car. My Clymer manual shows the PCV valve position to be the same from 70 -72, but says the 73-74 is different, but similar. Still curious as to the difference introduced with I'm guessing car HLS30-21001 from earlier cars? Since I consider hoses as "consumables" I'd like a spare. This hose is a different size at the block than it is at the PCV valve, at least on my 17,486 car.

Just a comment on the picture you posted of your car... I didn't know that Canada got Euro style non-emission cars back in the early days. That balance tube looks to be the Euro style tube available from ZTherapy and there are some differences I see in the carb linkage from my 12/70 USA car due to the non-emission, cool!