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Offenhauser Dual Port Intake Manifold AMC V8

Your Price: $628.83
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Part Number:6056DP

The Dual Port 360 can best be described by saying it’s actually two separate manifolds in one.  The entire manifold is divided from the base of the carburetor to the head flange.  In operation, the primary mixture is fed into the bottom runners and the engine operates on this smaller port until the engine demand cuts in the secondaries (the top port).  In the Dual Port, the primary system further restricts the air flow after passing the carburetor and increases it to the speed of sound.  This means that even at low engine RPM, it offers near perfect aerodynamic efficiency, which means MORE HORSEPOWER!!!  This intake can gain you fuel economy while also adding 15-30% more power!

This extra horsepower on the primaries comes from a more perfect mixture moving at near sonic speeds, a larger volume passing the intake valve and greater turbulence in the combustion chamber for a highly efficient use of fuel.  The primary system being on the bottom uniquely provides two layers of manifold casting and a high speed mixture flow which acts as a perfect insulator for the secondary runners.  And since the secondaries are insulated from engine heat, this means that when cut in, the secondary mixture will be colder and more dense, a further increase in performance.  Then, when the secondary mixture gets to the end of the runner, it is picked up and rammed into the combustion chamber by the sonic velocity of the primary port.  All of this means less fuel to gain more horsepower.  Also, this intake is proven to lower emissions due to its efficiency in mixing air / fuel.

This intake works well with the Intake Manifold Gasket with Valley Pan.  You can also transfer the oil baffle from your original intake manifold.  The holes for the baffle are pre-drilled, but bolts are not included and the holes are not tapped (you can tap and use a 10-32 or knurled spiral bolt to install).  

**NOTE: If using a carburetor spacer (ie: phenolic spacer), you must use the 4-individual hole style, and NOT the open center style.

  • Fits:All AMC V8's 1970-1991
  • Models:304 / 360 / 390 / 401
  • Dual Port Design
  • Square Bore Style
  • Increases Fuel Economy!
  • Increases Horsepower!
  • Performs from idle to 5500 RPM
  • Made in the USA

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