Offenhauser 6257DP Dual Port Intake Manifold 1981-1988 Jeep/AMC 258 4.2L
description
“The patented Dual Port is our STREET PERFORMANCE/ECONOMY DESIGN. in the Mini’s, the primary section boosts the fuel mixture to nearly the “speed of sound”, about 3 times faster than normal velocity. This positively gives each cylinder a full fuel charge every time to smooth out the power stroke. When engine or driver demand cuts in the secondaries, a cold (over 30° colder) and dense mixture is sent down the secondary runner to be rammed into the combustion chamber by the sonic flow to the primary runner. This adds up to 15-30% more horsepower, quicker throttle response, extended RPM range, better gas mileage, Quicker starting, reduction to exhaust emissions.
The two barrel mini Dual Ports come standard (order “DP”) to accept the stock 2 stage carburetor. However, as an alternative, most can be drilled to accept the Holley 5200 series (order “DPH”) or the Weber 32/36 series (order “DPW”)”
AMC, Dual Port, Jeep, Offenhauser, Aluminum, Intake Manifold, Jeep 258
“The patented Dual Port is our STREET PERFORMANCE/ECONOMY DESIGN. in the Mini’s, the primary section boosts the fuel mixture to nearly the “speed of sound”, about 3 times faster than normal velocity. This positively gives each cylinder a full fuel charge every time to smooth out the power stroke. When engine or driver demand cuts in the secondaries, a cold (over 30° colder) and dense mixture is sent down the secondary runner to be rammed into the combustion chamber by the sonic flow to the primary runner. This adds up to 15-30% more horsepower, quicker throttle response, extended RPM range, better gas mileage, Quicker starting, reduction to exhaust emissions.
The two barrel mini Dual Ports come standard (order “DP”) to accept the stock 2 stage carburetor. However, as an alternative, most can be drilled to accept the Holley 5200 series (order “DPH”) or the Weber 32/36 series (order “DPW”)”
AMC, Dual Port, Jeep, Offenhauser, Aluminum, Intake Manifold, Jeep 258
