Performer Cylinder Heads For Jeep 4.0l Inline Six

  • Cylinder Head Specifications:
  • 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
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. 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.

The Performer Jeep cylinder head features all-new better flowing intake/exhaust ports along with a modern combustion chamber design and backcut and swirl polished valves. It retains the stock valve angle, pushrod length and valve cover 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 promotes stiffness and durability. This cylinder head is machined to accept either distributor or coil pack ignition.

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

  Bare (Single) Complete (Single)
Application Dyno Emissions Satin Satin
Performer Jeep 4.0l Inline Six 50159 50169
Edelbrock Installation Note INSTALLATION NOTE: 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".
#50169: Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
Valve Lift .100" .200" .300" .400" .500" .600" .700"
Intake 66 123 179 221 241 237 -
Exhaust 63 103 127 144 151 155 -
Edelbrock Tech Note TECH NOTE: Please view Cylinder Head Flow Data and Valve Springs & Retainers for all Edelbrock Performance Aluminum Cylinder Heads.
The following guide is designed to help you determine which Edelbrock components are legal for use on your vehicle. Learn more about Edelbrock Product Emissions Guide.

    50-State Legal
    For Racing Use ONLY
    For Use on Pre-Pollution Controlled Vehicles (PPCV)
    Stock Replacement Part
    Engine Swaps