DNA MOTORING HDS MID-CR Stainless Steel Exhaust Header Manifold [for Chevy BBC 396/402/427/454/502]

The exhaust manifolds found in the 1965-1973 Chevy and GMC Big Block engine were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our 4-1 Mid-Length off-road headers are designed to allow the exhaust gasses to flow more freely from each 4 cylinder

The exhaust manifolds found in the 1965-1973 Chevy and GMC Big Block engine were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our 4-1 Mid-Length off-road headers are designed to allow the exhaust gasses to flow more freely from each 4 cylinder bank and combine in a more efficient manner. Tubing has been optimized for the 6. 5L (396ci), 6. 6L(402ci) 7. 0L(427ci) and 7. 4L(454ci) engines. This creates a reduction in cylinder backpressure and improved exhaust gas velocity. These improvements free up lost horsepower and torque. An added benefit is a more performance oriented exhaust sound.

Product Features

  • Made of High Quality Stainless Steel
  • TIG Welded CNC Machine Flange
  • 2 x 4-1 Racing Design
  • Increase High Flow Air, Instantly Gain 10 to 15 Hp. / Tq
  • Main Collector Piping Diameter: 2. 58″ / Inlet: 1. 65″ (8 Circle Ports) / Outlet: 2. 85″

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