They supplied me with a perfect set of heads to bring my 1999 Ford Ranger back to life. Ranger Frank has been in the family since the day he rolled off the showroom floor. Its great to have him back on the road.
Bought a pair of Remanufactured GM Chevrolet 6.2L Casting #549 Cylinder Head Direct Injection from these guys great product and service.
It's hard to believe no one has reviewed these guys yet. Very professional and detailed company it was a pleasure doing business with you. The answered the phone every time I called or answered every email in a timely manner! I will definitely use them for all my cylinder head needs moving forward. Thank again!
Parts arrived as promised. Ported heads gave me that low end torque and high rev HP I was looking for! ...if only I did the cam at the same time.
New Jeep Wrangler Cherokee 4.0L OHV Cylinder Head – Fits Casting Numbers # 0331, 0630, 7120 | No Core Required
Please verify your casting number is 0331, 7120, or 0630 before purchasing. Includes valves and springs installed.
$650.00
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Additional Info
New Jeep 4.0L Inline 6 Cylinder Head – Reinforced Universal Casting (1991-2007)
Upgrade your Jeep’s legendary 4.0L engine with a reinforced, crack-resistant cylinder head designed to outperform the 0331, 7120, and 0630 factory castings.
The Jeep 4.0L inline-six is famous for its longevity, but factory heads are notorious for cracking between the #3 and #4 cylinders. Our premium aftermarket replacement features a thickened deck and reinforced water jackets to eliminate these common failure points. This universal casting is a direct “bolt-on” upgrade for all 4.0L Jeep engines from 1991 to 2007, whether your original head used a distributor or coil-pack ignition.
🛠️ In-House Machining Process
- Debris-Free Preparation: Every new casting is chemically cleaned and blown out to remove all residual machining oils and manufacturing debris. This ensures your oiling system remains uncontaminated from the first start-up.
- In-House Precision Machining: We perform all final machine work in-house, including precision valve seat cutting and guide sizing, to ensure perfect geometry and clearances.
- Pressure & Integrity Testing: To go beyond the factory standard, we pressure-test every head to 60 PSI. This verifies that the casting is free of porosity leaks or internal defects.
- Dimensional Inspection: Our technicians perform a multi-point inspection of the gasket-sealing surface. This ensures the head is perfectly flat and meets tight OEM tolerances for a flawless fit.
- Vacuum-Seal Verification: Every intake and exhaust port is Vacuum Tested. This guarantees a 100% airtight seal between the valves and seats, ensuring maximum compression and peak performance right out of the box.
📊 Technical Specifications
- Engine: Jeep 4.0L Inline 6 (OHV)
- Year Range: 1991-2007
- Replaces Casting Nos: 0331, 7120, 0630
- Material: Heavy-Duty Cast Iron (Reinforced)
- Each Cylinder Head Includes: Valves and Springs Installed
🚛 Fitment Data
Common Applications:
- Jeep Wrangler (YJ/TJ/LJ): 1991-2006
- Jeep Cherokee (XJ): 1991-2001
- Jeep Grand Cherokee (ZJ/WJ): 1993-2004
- Jeep Comanche (MJ): 1991-1992
[+] Click to View Full Detailed Fitment List
COMANCHE 91-92 6-242 (4.0L)
GRAND CHEROKEE 93-95 6-242 (4.0L)
WRANGLER 91-95 6-242 (4.0L)
CHEROKEE 96-99 6-242 (4.0L)
GRAND CHEROKEE 96-98 6-242 (4.0L)
WRANGLER 97-99 6-242 (4.0L)
CHEROKEE 00 6-242 (4.0L)
CHEROKEE 01 (4.0L)
GRAND CHEROKEE 99-04 4.0L (6 cylinder)
WRANGLER 00-02 6-242 (4.0L)
WRANGLER 03-06 4.0L
📦 Core Return & Warranty
- ❌ NO CORE REQUIRED — No core fee, no return needed. Your old part is yours to keep or dispose of as you see fit.
- Warranty: 2-Year Unlimited Mileage Warranty included. Click here for Warranty details.
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