6257-DP Offenhauser Dual Port Single 4BBL Manifold 1981-1988 4.2L/258 AMC / Jeep L6 Cylinder

Offenhauser Dual Port Intake Manifolds

The Offenhauser Dual Port Design is best described as two separate manifolds in one resulting in more power across the rpm range. 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 demands more fuel. When the secondaries open, more fuel goes through the bigger, cooler upper passages. Fuel is then forced into the cylinders when it encounters the high-volume mix from the primaries. The results are better fuel economy and a 15-30 percent power increase across the entire rpm range.

Features:

AMC inline 6-Cylinder 4.2L/258 - 4-Barrel Square Bore Mounting - Standard Deck - Dual Plane Intake Style - Natural Aluminum - No EGR Valve - MADE IN THE USA

Fits These Vehicles:

1981-1983 Jeep CJ5

1981-1986 Jeep CJ7

1981-1985 Jeep CJ8 Scrambler

1981-1988 Jeep J10, J20 jeep Truck

1984-1988 Jeep Grand Wagoneer

Years: 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988