A12GX vs A12T: Manifolds are nearly identical, but A12T has two extra fittings
Center fitting (yellow arrow) is for IMS speed screw assembly.
Far left fitting (no arrow) is for power brake booster. NOTE: Early Nissan Cherry A12T may be missing this fitting
A12T/A12GX versus A14T Port Sizes
* A12T: 30x35 mm
* A14T: 28x34 mm
A14T identification