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).

Fuel your 4.0L Jeep's performance with the Edelbrock Jeep 4.0L Inline Six Performer Aluminum Cylinder Head—a precision-crafted bolt-on upgrade that brings modern efficiency to your classic ride. Designed for 1987–2006 Jeep 4.0L inline-six engines, this cylinder head delivers significantly improved airflow thanks to updated intake and exhaust port profiles, polished valves, and optimized combustion chambers.

Installation is straightforward and reliable. The stock valve angles, pushrod lengths, and valve cover bolt pattern are maintained, ensuring compatibility with factory components and ease of integration. Reinforced rocker bosses and Heli-Coil inserts in the intake manifold bolt holes offer added strength for high-rpm driving, while the robust 3/4" deck enhances rigidity and long-term durability.

Flow-forward engineering doesn't sacrifice drivability. The ports are sized to match 1991–2006 intake manifold placements and 1991–1998 exhaust port layouts, so existing manifolds and headers—factory or aftermarket—can be reused. The head even accommodates both distributor and coil pack ignition setups, giving you flexible tuning and service options.

Whether you’re restoring a trail-ready Jeep or boosting power under the hood of a daily ride, this upgrade delivers solid gains while enhancing cooling, throttle response, and reliability. The jeep 4.0 edelbrock head delivers real-world improvements. Replacing a worn 4.0 jeep head with this Performer aluminum version means cooler, stronger performance. Plus, if you're working on a 1998 Jeep, it's a worthy replacement for the 1998 jeep 4.0 cylinder head—offering better flow, fewer emissions headaches, and undeniable street muscle.

Unlock the true potential of your inline-six with this modern, performance-grade upgrade from Edelbrock.