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Re: Exhaust to intake connection

From: Dave Homstad
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Date: September 05, 2002


Robert, On 56 and earlier Dodge Hemis, the function of the small pipe in the RH exhaust manifold is to provide heated air to the choke housing mounted on the carb. This is a through pipe sealed from the exhaust gases (unless it is rusted out). In 57, the choke bi-metal spring was relocated to a pocket in the intake manifold, above the exhaust cross-over, and then a link rod went up to the choke lever. Since the 57 325 Hemi used the same P/N exhaust manifold as the 55/56 Hemi, the tube is present, but non-functional (unless you have a 2x4 carb intake manifold, where it is still used). Assuming you are using a factory WCFB 4 bbl carb, the vacuum advance line from the distributor goes to a threaded vacuum fitting on the front of the carb. The large hole (3/8?) in the intake manifold behind the carb is for the vacuum supply to the power brakes, when so equiped. A PCV valve from the draft tube could be run into the intake manifold threaded hole for the power brakes, but this may result in an un-even fuel distribution. The best solution is to find a carb spacer plate to put under the carb to evenly distribute the PCV gases. Above the #1 cylinder on 56 Hemis/Polys, the intake manifold has a threaded boss for mounting the generator. In 56, all Hemis and only Polys with power steering used this generator mount. Non-PS Polys mounted the generator on the RH exhaust manifold and may not have had this hole drilled and tapped (mine didn't). In 57, the power steering pump moved to the front of the block (from behind the generator in 56), so all Polys probably had the hole un-drilled. You probably have a Poly intake manifold, which is interchangeable on the Hemi.


Last changed: July 19, 2018