Too confusing !!

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They look to be A12T carbs, as they have the air bleed cct and the carb domes are flat tops. They should work just fine.

JDM GX are always dome-top
* A12T 1973-1975 were flat-top
* South Africa GX (1973-1975) were also flat-top

GX is the B110 trim level which was only offered 1970-1972 (except in South Africa). A12T refers to the A12 twin carburetor engine

In addition to the above info, keep in mind that A12GX/A12T manifolds don't fit A14/A15 heads

A14/A15 ports (top) are narrower and shorter



You can have the A14/A15 head ported out to match the A12T manifold

A12T carburetors are exactly like A12GX carburetors, except for the change from dome-top to flat-top suction chambers (purely cosmetic)


plus some additions:
* addition of vent hoses. GX engine just spilled excess fuel on the ground
* addition of Idle Mixture System for fine-tuning of idle speed and idle a/f ratio (two screw adjustments + large hoses)

It also has a much better heat shield than the GX, which protects the fuel lines

The additions look confusing. These may help break it down
Idle Mixture System (IMS)



Vent Hose System

Not fitting the A15 head, thats a deal breaker.

Maybe I should clarify. It will bolt to the A15 head, but there is a port mismatch (GX manifold has larger ports than A14/A15 oval-port head). Many run it even so, although performance is not optimal. Alternatively you can match the ports by grinding away 8mm or so at the face of the head out to the larger size so it matches the manifold. Doesn't need full head porting. Azza_bijan even recommended NOT enlarging the ports to match the intake

A15/A14 head with water ports is best (e.g. H89) so that the manifold will atomize the fuel mixture fully at low throttle openings. Some have run it on "dry" heads, full-throttle power is good, and the idle mixture can be adjusted so it runs OK at low speed/low throttle

I wouldn't hesitate to use the A12T kit

Port mismatch is easily overcome with some port matching. Port match, don't gasket match.