6057-DP Offenhauser Dual Port Intake Manifold, Spread Bore, Quadrajet Carb 1970-1979 AMC / Jeep V8

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 V8 304, 360, 390, 401 - Spread Bore Mounting - Standard Deck - Dual Plane Intake Style - Natural Aluminum - No EGR Valve - MADE IN THE USA

Jeep Applications Require Offenhauser Choke Block Off Plate & Water Outlet Riser Kit #6094

Engines: 1970 AMC 390 V8 - 1970-1979 AMC 360 V8 - 1970-1979 AMC 304 V8 - 1971-1976 AMC 401 V8

Fits These Vehicles:

1970-1979 American Motors Vehicles

1970-1979 Jeep CJ5

1976-1979 Jeep CJ7

1974-1979 Jeep J10, J20 Truck

1974-1979 Jeep Cherokee / Wagoneer

Years: 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979