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Offenhauser Dual Port Intake Manifold for 1981 - 1988 Jeep

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16.00 LBS
$20.00 (Fixed shipping cost)
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Product Description

Offenhauser Dual Port Intake Manifold 6257 DP 

Features a separate runner systems for the primaries and secondaries. At low-load, the primaries feed the fuel-air charge through the smaller bottom passages at near sonic speed, improving power and efficiency. When the secondaries open, their charge goes through the bigger, cooler upper passages. Then, in turn, it is rammed into the cylinders when it encounters the high-velocity mix from the primaries. The results are better fuel economy and a 15-30 percent power increase across the whole rpm range

Fits 1981 - 1988 Jeep with AMC 258 (4.2L) inline 6


For Holley 4150/4160 Carbs.

Holley #0-8007 (390 CFM) No modification necessary

Holley #R6299  (390 CFM) Main Jet #50; Secondary Jet #50; Power Valve 125-65 

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