Description
AMC Jeep Chrysler 258 4.0 H.O. Conversion Cylinder Head
Upgrade your Jeep or AMC 258 engine with the AMC Jeep Chrysler 258 4.0 H.O. Conversion Cylinder Head, designed for a performance boost. This rebuilt cylinder head (Casting #7120 or #0630) provides a significant power increase of 30-40 horsepower, giving you more performance for your investment.
This cylinder head is specifically built for the AMC Jeep Chrysler 258 motor. It features properly fused and welded water jacket holes to fit a 258 block, ensuring superior durability. The head has been resurfaced on our Rottler SF 1400 machine for precision, while all valve seats are meticulously cut at three angles using our Serdi 4.0 to ensure excellent concentricity.
Once resurfaced, the cylinder head is pressure tested to ensure optimal performance. It is then reassembled with high-quality, new valves, guides, and seals.
Key Features
- Casting Numbers: 0630 (delivered as standard)
- Performance Gain: 30-40 HP boost
- Compatibility: Fits AMC Jeep Chrysler 258 block
- Precision Machining: Resurfaced on Rottler SF 1400, 3-angle valve seat cutting
- Complete Reassembly: New valves, guides, and seals installed
- Durable Welded Water Jacket Holes: Correctly sealed for 258 block compatibility
- No Core Return Required
Important Notes:
- Requires 4.0 valve cover, 4.0 exhaust manifold/header, 4.0 head gasket, and exhaust manifold gasket.
- New 1/2-inch head bolts are necessary for installation.
Core Return Process
We make core returns easy! You have 30 days to return your old cylinder head with no upfront core charge. Simply use the prepaid FedEx label included with your purchase to send it back in the original packaging. We accept all cores, regardless of condition—cracked, bent, or disassembled. Please note that there will be a penalty for not returning the core, which will be reflected as an additional charge on your invoice.
Clearwater Cylinder Head, Inc. – Quality You Can Trust
At Clearwater Cylinder Head, Inc., we thoroughly clean, inspect, and pressure test all our cylinder heads. Using state-of-the-art equipment, we perform all seat and guide work, resurface the head to the required finish, and ensure a perfect seal between the valve and the seat with quality valve seals and vacuum testing. Therefore, our commitment to quality craftsmanship ensures that every cylinder head is ready for installation and built to last. Whether you’re replacing a worn cylinder head or upgrading for enhanced performance, our products meet or exceed OEM standards.
Shipping Information
Rates apply to the continental United States only. For Alaska, Hawaii, Guam, Virgin Islands, and Puerto Rico, please call or email for shipping rates. We ship worldwide, with insurance, packaging, and handling included in the shipping price. International bidders, please include your city, country, and postal code when inquiring about shipping fees.
Warranty Information
- Coverage: Clearwater Cylinder Head, Inc. provides two-year unlimited mileage parts warranty. A warranty card is included with your invoice.
- Terms: Acceptance of the head includes acceptance of the warranty terms:
- Heat tab must be intact and unaltered.
- Returns must be accompanied by a copy of the invoice and a Return Authorization number.
- Warranty covers parts only; no labor or incidental costs.
- Warranty does not cover damage from improper installation, overheating, abuse, or neglect.
Contact Us
If you have a rare or hard-to-find cylinder head, let us rebuild it for you. We have thousands of heads in stock and deal with all makes and models. If you don’t see the cylinder head you need, please contact us at 1-800-572-1963. Our knowledgeable staff is ready to assist you.
Operating Hours: Monday – Friday, 8 AM to 5 PM EST
Address: 5100 Ulmerton Road #2, Clearwater, FL 33760, USA
Additionally, Learn More and Shop with Us
- Chrysler – Overview: Chrysler
- Checkout this AMC Chrysler Cylinder Head – Clearwater Cylinder Heads – AMC Chrysler Cylinder Head
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