I have a Ford MS smog/vacuum pump question

[BirdMan]

I don't know which is suction/into pump and which is outflow. It has a large 1" port and a smaller 3/4" one which I think goes to puke tank?? A picture I can't copy at the moment.

[Kevin Johnson]

These are pictures of the pump in question. Feel free to comment:

[BirdMan]

I have it figured out as I used my CraftsMan drill press motor & belt to power/rotate pump. Large hole is side pulls air into pump from engine crankcase/valvecovers and will have an adjustable vacuum break and exhales through the smaller hole at rear of pump which will go to breather tank.

[Walter R. Malik]

Ford Truck, 22 cubic inch emission vacuum pumps were used for crankcase pumps years ago so, a Ford Truck manual may tell you this information.

Back in those days, we actually used 2 of those pumps to supercharge a Chevette.

Just run it in the clockwise direction, (looking from the front), and it will tell you the inlet from the outlet.

[BirdMan]

I turned with my drill press and have it figured out. Thank you!