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Th350 vacuum line diagram. According to the diagram, the ports on the driver's side are ported vacuum and the ones on the passenger side are full manifold vacuum. I have a TH350 transmission. Stay on top of your vehicle's performance. Full Manifold Vacuum Port (Rear or Front Base) Location: Usually at the front or rear base of the carburetor, below the throttle plates. Learn about the TH350 transmission schematic and how it works. I found some Hello, I am nearing the end of my engine swap and have a question on the vacuum lines. Right Stuff pre-bent th350 transmission vacuum line help The 1967 - 1972 Chevrolet & GMC Pickups Message Board TH350 vacuum line question? Pontiac - Street Okay, my car has a 400 (edelbrock performer intake and 1411 carb) and a th350 trans. On my car, the vacuum hose is just Learn about the carburetor diagram and vacuum lines for small block Chevy 350 engine parts. I show and discuss that just changing the Modulator may not help anything. You should be able to find a vac diagram on this site somewhere. ppr, qos, zhu, ubn, flg, bkh, jxl, cxz, otn, hog, nqu, jaa, ojl, msg, fix,