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Edelbrock Performer Aluminum Cylinder Head for 76-06 Jeep Vehicles with 4.0/4.2L

Performer Aluminum Cylinder Head

Quadratec Part #: 51108-2001

Edelbrock Part #: 50169

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Description

This new Performer cylinder head is designed as a bolt-on performance upgrade for 1987-2006 Jeeps with a 4.0L inline six cylinder engine. It features all-new better flowing intake and exhaust ports, a modern combustion chamber design with back cut and swirl polished valves. It retains the stock valve angle, pushrod length and valve cover bolt rail height for use with factory components and off the shelf accessories. It also features larger reinforced rocker bosses for improved strength at high RPM and Heli-Coil® threaded inserts in the manifold bolt holes for added strength. A 3/4" deck throughout the head also provides improved durability. It's machined to accept either distributor or coil pack ignition.

CARB EO # D-215-94

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Details

The Performer Jeep 4.0L is designed with 1991-2006 4.0L intake port locations and must be used with 1991-2006 intake manifold.

The Performer Jeep 4.0L is designed with 1991-98 4.0L exhaust port locations and must be used with 1991-98 factory header or aftermarket exhaust header.

This cylinder head will also fit 1976-90 AMC 4.2L engines with no modification to the water jacket and the appropriate intake manifold and header combination.

This cylinder head is pending 50-state emission legal for 4.0L engines when used with factory fuel injection components. It's also pending 50-state emission legal for AMC 4.2L engines when used with a Mopar Fuel Injection Conversion Kit (E.O. Number D-265-21).

Designed for 1987-2006 Jeep 4.0L inline six cylinder engines
Can be used with 1976-90 AMC 4.2L engines with no modification to the water jacket and the appropriate intake manifold and header combination
Available with 55cc combustion chambers, 144cc intake and 77cc exhaust runners, 1.91" intake and 1.50" exhaust valve sizes for up to 0.540" max lift
Sold bare (#50159) and complete (#50169) with springs engineered for hydraulic flat tappet camshaft applications

Combustion chamber volume: 55cc
Intake runner volume: 144cc
Exhaust runner volume: 77cc
Intake valve diameter: 1.91"
Exhaust valve diameter: 1.50"
Valve stem diameter: 5/16"
Valve guides: Manganese bronze
Deck thickness: .750"
Valve spring diameter: 1.26"
Valve spring maximum lift: .540"
Rocker stud: N/A
Guideplate: N/A
Pushrod diameter: N/A
Valve angle: 10° (stock)
Exhaust port location: Stock (1991-98)
Spark plug fitment: 14mm x 3/4 reach, gasket seat

Recommended spark plugs: Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat. Recommended gasket for 4.0L: Edelbrock #7348 or Fel-Pro #26211PT. Deck thickness: 3/4".

Installation Notes

Installation Difficulty: