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Offenhauser 6257DP - Offenhauser Dual Port Intake Manifolds

  • Intake Manifold, Dual Port, Aluminum, Natural, Square Bore, AMC, 258, L6, Each
  • Application Specific
  • Estimated Ship Date: 5/29/2012
 
BrandOffenhauser
Manufacturer's Part Number6257DP
Part TypeIntake Manifolds, Carbureted
Product LineOffenhauser Dual Port Intake Manifolds
Summit Racing Part NumberOFY-6257DP
 
Engine Block StyleStock/OEM standard deck
Carburetor QuantityOne
Intake StyleDual plane
Intake FinishNatural
Intake MaterialAluminum
EGRNo
QuantitySold individually.
NotesNot for use with automatic transmission application.
CalculatorCFM Calculator
 

Offenhauser Dual Port intake manifolds feature completely 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 result is better fuel economy and a 15-30 percent power increase across the whole rpm range.

Warranty

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Application

Results 1-1 of 1

 
MakeAMERICAN MOTORS
Engine TypeL6
Engine Size4.2L/258
Liter4.2
CID258
Beginning Year1981
Ending Year1988
Engine FamilyAMC inline 6-cylinder
Carburetor Mounting4-barrel square bore
Cylinder Head Style (application)Stock configuration
Application NotesWater heated.
CalculatorCFM Calculator
 

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Suggested Parts: Parts that may improve the performance or installation of part number OFY-6257DP.

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Estimated Ship Date: 5/29/2012

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  • Mr. Gasket 57 - Mr. Gasket Carburetor Base Gaskets

Carburetor Mounting Gasket, Nitrile Rubber Composite, 4-Barrel, Square Bore, 4-Hole, .060 in. Thick, Each

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Estimated Ship Date: 5/29/2012

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  • Trans-Dapt Performance Products 2071 - Trans-Dapt Performance Carburetor Gaskets

Carburetor Mounting Gasket, Nitrile Rubber Composite, 4-Barrel, Square Bore, 4-Hole, .032 in. Thick, Each

Part Number: TRD-2071

Estimated Ship Date: 6/11/2012