Allis Chalmers Manifold with Threaded Exhaust for D17 / 170 / 175

Replacement exhaust manifold for Allis Chalmers D17 Series III and Series IV (SN: 32001 & up). Also fits 170 and 175 Gas models. Features a 1 1/2" pipe thread exhaust connection. Direct replacement for part numbers 70257485 and 257485; cross reference acs081.