This is an original GM exhaust manifold for Small Block Chevy engines. The casting number is 3747038 as shown. The back side is cast "D30" as shown. The 3747038 exhaust manifold is a passenger's side manifold that was original equipment on many 1958-1965 Corvette and passenger car models. This manifold will also work on many other applications. Please confirm your specific application.
This manifold is in very good original condition overall. The casting is clean and chrisp. I see no breaks, modifications, or repairs to this manifold other than one pipe stud that needs to be replaced. The heat riser is there but needs to be replaced. This is a very nice OEM GM exhaust manifold.
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