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