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.
The experience was excellent. My part came sooner than expected and was exactly as advertised. This is how a business should be run. I would give 6 stars if I could, thank you HDPC
Best prices and customer service on Duramax LML heads out there. Shipped fast and very cool about how long it took to get the cores back.
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.
New Jeep 4.0L OHV Cylinder Head – Fits Casting Numbers # 0331, 0630, 7120 W/ Head Gasket and Bolts | No Core Required
$800.00
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Additional Info
New Jeep 4.0L OHV Cylinder Head w/ Head Gasket & Bolts – Fits Casting # 0331, 0630, 7120
Upgrade your Jeep’s 4.0L engine with a reinforced, crack-resistant cylinder head kit, including a premium head gasket and bolt set for a complete installation.
The Jeep 4.0L inline-six is a legend, but factory heads—especially the 0331 casting—are prone to cracking. Our premium aftermarket replacement features a thickened deck and reinforced water jackets specifically engineered to eliminate these common failure points. This universal design is a direct bolt-on for all 4.0L engines from 1991 to 2007, providing a permanent solution for your Cherokee, Wrangler, or Grand Cherokee.
🛠️ 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 100% 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: High-Strength Reinforced Cast Iron
- Each Cylinder Head Includes: Valves and Springs Installed
- Additional Hardware: Head Gasket Set and Bolts
🚛 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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