CCKW exhaust pipe

RANGER · Post by **RANGER** » Wed Nov 08, 2006 1:19 pm

NOS are very scarce, those that do find one are very fortunate as they will have a perfect fit.

If you are having one fabricated at a muffler shop, you may want to go this route. The originals are flared with a short sleeve inside the flare that must fit correctly into the exhaust manifold in order to ensure a secure, leakproof installation. If only the end is flared, and the sleeve is not there, there will be a chance for motion and a leak in a very short time. It is difficult for the shop to duplicate the correct end.

The best way to get around the problem is to purchase the NOS front section of the M-Series GMC Exhaust Pipe GM(YT)-2277580 at a dealer such as Memphis Equipment in Chambersburg PA. The pipe has the correct end and a NOS flange that you can use. The end can be cut off and spliced to the new pipe you are having made. You will then have the best possible combination of a new pipe with a correct fit at the manifold, and will not experience the problems that others have with muffler shop fabrications.

RANGER · Post by **RANGER** » Sat Nov 11, 2006 7:48 pm

There are reports from some who are installing NOS Exhaust pipes and having a difficult time with fit, gaskets etc. The helpful hints that are generated are not correct. The final Exhaust pipe GM-2156763 is the correct pipe for all LWB/SWB after Chassis 41224 except for the M-27 and Water Tankers. The winch and non winch use the same pipe. If the Gasket GM-2017499 is being cut by rthe flare of the pipe it is because the metal seal GM-2025630 is not being installed, which goes on top of the Gasket. Post War Exhaust Manifolds are correct for the CCKW 270 and the CCKW pipe. There was an upgrade where the flange of the later manifold was turned a few degrees but the Exhaust Pipe Flange that slides up to mate with it will rotate to any angle. The Post War M-Series and Civilian Exhaust Manifold is the same listed inthe 1950s SNLs. Post war GI Issue CCKW Exhaust Pipes are same as wartime manifolds and share the same casting number as the M-Series GMC. They are no longer produced by GM, and were deleted from the GM warehouses in the late 80s.