First of all, sorry to ask if the info is already posted somewhere but I can't seems to find the right answers...

Will start the fresh rebuilt engine tomorrow. While reassembling I have decided to delete the su’s heating. Then came the questions...

A ) To keep OEM,

B ) To plug 

C ) To leave open the following :

Photo 1 and Photo 2 : both sides of N36

Photo 3 : to balance tube

Photo 4 : on driver inner fender, connector from tank to ... 3 hoses

Photo 5 : on balance tube, 1 underneath, 1 on top...

Thank you!!

Edited September 18, 20195 yr by ZCarFever

I plugged mine but I live in a hot climate and it lives in a garage that never gets too cold.  Lessened the leak potential was my reason.  It had no effect that I've noticed, car runs great.

Plugged off the coolant line where it all starts on the passenger's side, then plugged the intake closest to the windshield, left the connecting tube in between the intakes, plugged the front intake closest to the radiator and finally the thermostat housing

Tks! What about no 4 on the photos, what have you done with that one?...

My '72 doesn't have that.  Your's looks like it could be a vacuum for the brake booster?  I'm wrong, I see your's now.

What year is your car? Country?  It has some things I've never seen.

Edited September 18, 20195 yr by siteunseen

Quebec I see.  And I'll guess the #110 '73. 

Edited September 18, 20195 yr by siteunseen

Yes... and it will not see the snow!

 

I could have detailed a bit more the engine, will probably do this winter...

Great car!!!  Your #4 pic is the Flow Guide Valve, it routes crankcase and fuel tank vapors into the air filter box for combustion.  Two ports face the engine, one port faces rear.  The lower of the two ports connects to the crankcase breather pipe, the upper port connects to a small forward-facing tube on the back of the air filter, the rearward port connects to a hard line rising from the left frame rail (coming from the fuel tank).  Since you are running the stock air filter set-up, there is no gain by not connecting these ports.  If you leave them open you are adding some small amount of vapors to the atmosphere.

#57 on the catalog diagram: http://www.carpartsmanual.com/datsuns30/Datsun-Z-Index/Engine-240Z-260Z/Emission-Control-Device

@siteunseen your car may not have one now but it did at one time - it was stock thru '73.

Edited September 18, 20195 yr by jfa.series1

My apologies.   I was counting the pictures and not even paying attention to the numbers he painted in.  It's #3, that's the one that confused me (still does).

Our '73 man, @Zup will know.

Edited September 18, 20195 yr by siteunseen

44 minutes ago, jfa.series1 said:

Great car!!!  Your #4 pic is the Flow Guide Valve, it routes crankcase and fuel tank vapors into the air filter box for combustion.  Two ports face the engine, one port faces rear.  The lower of the two ports connects to the crankcase breather pipe, the upper port connects to a small forward-facing tube on the back of the air filter, the rearward port connects to a hard line rising from the left frame rail (coming from the fuel tank).  Since you are running the stock air filter set-up, there is no gain by not connecting these ports.  If you leave them open you are adding some small amount of vapors to the atmosphere.

#57 on the catalog diagram: http://www.carpartsmanual.com/datsuns30/Datsun-Z-Index/Engine-240Z-260Z/Emission-Control-Device

@siteunseen your car may not have one now but it did at one time - it was stock thru '73.

I do have that!  You are correct Sir.

So 1 and 2 could just be plugged?

No. 3 does puzzles me too... Maybe the pipe is not at the right place?!.. it has 2 welded bracket on it to fix it somewhere...

and what about no. 5? ??

I'm bowing out, sorry.

Your's is different than mine.  Good luck, I'm sure you'll get the answers from the guys on here.

@siteunseen No worries tks!