The Edelbrock #50159 Performer Cylinder Head is designed as a bolt-on performance upgrade for 1987-2006 Jeep's with a 4.0L inline six engine. They feature better flowing intake/exhaust ports along with a modern combustion chamber design and back cut 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. 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.

Installation Instructions

This Part Fits:

Year	Make	Model	Submodel
1987-2000	Jeep	Cherokee
2001	Jeep	Cherokee
1987-1992	Jeep	Comanche
1993-2004	Jeep	Grand Cherokee
1997-2003	Jeep	TJ
2004	Jeep	TJ
2005-2006	Jeep	TJ
1987	Jeep	Wagoneer
1988-1990	Jeep	Wagoneer
1991-1995,1997-2006	Jeep	Wrangler

Applications	AMC:-:256 (4.2L);Jeep:-:244 (4.0L)
Description	The Edelbrock #50159 Performer Cylinder Head is designed as a bolt-on performance upgrade for 1987-2006 Jeep's with a 4.0L inline six engine.
Description_TRA	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).; 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".
RGL	WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.