| Chevrolet GM Exhaust Manifold 3797901 And 3797902 |
| The GM exhaust manifold casting numbers 3797901 and 3797902 identify the high-performance, 2.5-inch outlet "Ram Horn" style manifolds used on early 1960s Chevrolet 327 small-block V8 engines. They are highly sought after for restoration and high-flow performance builds because they offer significantly better flow than the standard 2-inch versions. Identification and Side Placement Casting 3797901 (Left/Driver Side): Used primarily on 1962–1963 Corvettes with 300hp or 340hp engines. It features side-facing mounting holes for generator or alternator brackets. Casting 3797902 (Right/Passenger Side): Used between 1962–1965 on Corvettes and some full-size passenger cars with 327 engines. It is often associated with Fuel Injection (FI) models because it lacks an internal choke tube. Key Specifications Outlet Size: 2.5 inches (standard manifolds are typically 2.0 inches). Material: Cast Iron. Design: "Ram Horn" style with a side-facing accessory bracket. Applications: Corvette: 1962–1965 (High-performance 327 models including 300hp, 340hp, 360hp, 365hp, and 375hp). Full-Size Chevy: 1957–1970 |
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