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
The Performer cylinder head Designed as a bolt-on performance upgrade for 1987-2006 Jeepís with a 4.0L inline six engine. They feature better flowing intake/exhaust ports along with a modern combustion chamber design and backcut and swirl polished valves for improved flow. Retains the stock valve angle, pushrod length and valve cover bolt pattern for use with factory components and off the shelf accessories. Larger reinforced rocker bosses for improved strength at high RPM and Heli-Coil® threaded inserts in the intake manifold bolt holes for added strength as well as a 3/4" deck throughout the head also promotes stiffness and durability. This cylinder head is machined to accept both distributor or coil pack ignition.

FITMENT: This Performer cylinder head is designed as a bolt-on performance upgrade for 1987-2006 Jeeps with a 4.0L inline sixcylinder engine. To optimize airflow, this cylinder head is designed with a 1991-2006 4.0L intake port location and 1991-98 4.0L exhaust port size. As a result, this cylinder head must be used with a 1991-2006 intake manifold and a 1991-1998 exhaust manifold. Aftermarket exhaust headers can also be used in place of 1991-1998 exhaust manifolds and MUST be used in place of 1999-2006 exhaust manifolds. Most aftermarket exhaust headers are compatible, but please check with the exhaust header manufacture to verify. This head is NOT compatible with 1999-2006 OEM exhaust manifolds.

EMISSIONS: This cylinder head is 50-state emission legal for 4.0L engines when used with factory Fuel Injection calibration and components (E.O. Number D-215-94). Pending 50-state emission legal for 4.2L engines when used with a Mopar Fuel Injection Conversion Kit (E.O. Number D-265-21).

Model Year Intake Manifold Exhaust Manifold
1999-2006 OEM MUST use aftermarket exhaust header
1991-1998 MUST use 1991-2006 OEM intake OEM or aftermarket exhaust header
1987-1990 MUST use 1991-2006 OEM intake MUST use aftermarket exhaust header
1976-1990 (AMC 4.2L) MUST use appropriate intake MUST use appropriate exhaust
Note: Most aftermarket exhaust headers are compatible with this head. Check with header manufacture for fitment
  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