I'm working on a restoration project of a 73Z.  I'm installing 3 screw round top carbs off a 72 engine.  To keep from getting things mixed up I'm working on one carb at a time.  I'm currently working on the rear carb. My rebuild kit is a Napco for 72Z.  Bought if from a supplier in Japan.  The kit has 2 sets of needle jets.  One is marked N54 and the other is marked M43.  Do the front and rear carbs use different needles?  If so, which one goes where? If not, which set should I be using?  The car is going to be pretty much stock, manual trans and exhaust headers.  I removed the needle from the rear carb slide, but I don't see any number marking on it or they are just illegible.  Any help greatly appreciated.

More than likely they should both be n54

From the fische...

From Sep.-'71 To Jun.-'72)
JET-NEEDLE (N-54) - 16354-E8800
JET-NEEDLE (N-58) - 16354-E8810

I'm thinking the N-54 is for the manual trans and the N-58 is for the auto.

Thanks.  I'll use the N54's

I so love the fact you can easily swap carburetor needles on a 240Z and tune it with a twist of a mixture knob and turn of an idle screw. 

This sure beats taking out a laptop and remapping an ECU.

15 minutes ago, DatsunZGuy said:

I so love the fact you can easily swap carburetor needles on a 240Z and tune it with a twist of a mixture knob and turn of an idle screw. 

This sure beats taking out a laptop and remapping an ECU.

Hahaha!!!!   @madkaw

1 hour ago, DatsunZGuy said:

I so love the fact you can easily swap carburetor needles on a 240Z and tune it with a twist of a mixture knob and turn of an idle screw. 

This sure beats taking out a laptop and remapping an ECU.

Yeah I hate tuning my stroker with a laptop - it’s so boring