Designed as a bolt-on performance upgrade for 1987-2006 Jeeps with 4.0L inline six cylinder engine. This cylinder head is designed with the 1991-2006 4.0L intake port locations and must be used with 1991-2006 intake manifold, while the exhaust side features the 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, modern combustion chamber design with back-cut and swirl polished valves. It retains the stock valve angle, pushrod length and valve cover rail height for use with factory components and other 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 thickness throughout the head also promotes stiffness and durability. Edelbrock also machined provisions on this cylinder head to accept either distributor or coil pack ignition. Made In The USA!
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 4.2L engines when used with a Mopar Fuel Injection Conversion Kit (E.O. Number D-265-21).