New Pair Mercruiser 7.4L 454 Marine Cylinder Heads – Cast Iron Casting # 279 W/ Head Gasket Set and Bolts, Water Pump & Timing Set

Introducing the New Pair Mercruiser 7.4L 454 Marine Cylinder Heads – Cast Iron Casting #279, designed for maximum durability and performance in demanding marine environments. This complete set includes fully assembled cylinder heads, a head gasket set, bolts, water pump, and timing set, ensuring a secure and hassle-free installation. Built from heavy-duty cast iron, these heads withstand high heat, pressure, and saltwater exposure, ensuring long-lasting reliability. Perfect for engine rebuilds, repairs, or upgrades, they offer an OEM fit for seamless performance in your Mercruiser 7.4L 454 engine.

Key Features of Mercruiser 7.4L 454 Marine Cylinder Heads

• Vehicle Compatibility: Designed for Mercruiser 7.4L 454 marine engines for an OEM fit.
• Complete Installation Kit: Includes head gasket set, bolts, water pump, and timing set, providing everything you need for installation.
• Heavy-Duty Cast Iron Construction: Ensures maximum strength and corrosion resistance, ideal for marine environments.
• Preloaded with Valves & Springs: Offers quick and hassle-free setup.
• Engineered for Marine Use: Built to handle high heat and saltwater exposure, ensuring long-lasting durability.
• Perfect for Engine Rebuilds & Performance Upgrades: Designed to enhance engine power and reliability.

Applications for Mercruiser 7.4L 454 Marine Cylinder Heads

• Mercruiser/GM 7.4L 454 marine engines
• CHEVROLET 2500 PICKUP 96-00 8-454 (7.4L);
  CHEVROLET 30 VAN 96 8-454 (7.4L); 30 HD
  CHEVROLET 3500 PICKUP 96-00 8-454 (7.4L);
  EXPRESS 3500 VAN 96-00 8-454 (7.4L);
  GMC 2500 PICKUP 96-00 8-454 (7.4L);
  GMC 3500 PICKUP 96-00 8-454 (7.4L);
  GMC 3500 VAN 96 8-454 (7.4L); 3500 HD
  SAVANA 3500 VAN 96-00 8-454 (7.4L);
  SUBURBAN 2500 96-99 8-454 (7.4L);

Ensure maximum reliability and efficiency in your Mercruiser 7.4L 454 engine with this all-in-one cylinder head set, designed to keep your boat running smoothly for years to come.

Heavy Duty Parts Company – Quality You Can Trust
At Heavy Duty Parts Company, we take quality seriously. We thoroughly clean, inspect, and pressure test each cylinder head to ensure it meets the highest standards. Our state-of-the-art equipment is used for all seat and guide work, resurfacing, and vacuum testing. Whether you’re replacing a worn cylinder head or upgrading for enhanced performance, our cylinder heads exceed OEM standards, ensuring reliability and efficiency.

Warranty Information:

• Coverage: Heavy Duty Parts Company provides a two-year unlimited mileage parts warranty. A warranty card will be included with your invoice.
• Terms: By purchasing the cylinder head, you agree to the following warranty terms:
  • Keep the heat tab intact and unaltered.
  • Include a copy of the invoice and a Return Authorization number for returns.
  • The warranty covers parts only; labor and incidental costs are not covered.
  • The warranty does not cover damage caused by improper installation, overheating, abuse, or neglect.

Heavy Duty Parts Company – Core Returns Policy

Effective December 17, 2025

At Heavy Duty Parts Company, core returns are essential to our ability to provide high-quality, cost-effective cylinder heads. Returned cores supply critical components—such as keepers, springs, and retainers—that are vital to proper engine performance and allow us to maintain OEM-level quality.

No Upfront Core Charge

Unlike many suppliers, we do not charge a core fee upfront. Instead, we rely on customers to return their used cores within the required timeframe.

Core Return Requirements

• Cores are due within 30 days of the purchase date

• If a core is not returned within 60 days, the product warranty is void

• Unreturned cores will be charged as follows:

  • Cylinder heads under $600: $200 per unreturned core

  • Cylinder heads $600 and above: $400 per unreturned core

Customers needing additional time may contact us to request an extension. Approved extensions will prevent core charges from being applied.

Core Return Process

Cylinder heads are shipped with prepaid core return labels included in packets attached to the outside of each box. If labels are missing, customers should contact us for replacements prior to returning the core.

Core Eligibility

Some cylinder heads do not require a core return. In certain cases, core requirements may be waived at our discretion.

Why Core Returns Matter

• Reused core components help maintain OEM-quality standards

• Core returns allow us to keep pricing competitive

• Recycling cores supports sustainability by reducing waste and conserving resources

This policy applies to all purchases made on or after December 17, 2025.

Send Back All Components

To ensure the quality and integrity of our remanufacturing process, we ask that you return all components that were originally included with your new cylinder head. This includes items such as:

• Rocker arms
• Camshafts (if applicable)
• Any other hardware that came with your purchase

Easy & Free Core Return Process

• Each purchase includes a prepaid core return label in a plastic sleeve on the box.
• Simply pack your core with all included components, attach the label, and drop it off with the carrier—no extra cost to you.
• Returned cores undergo inspection and recycling, ensuring maximum efficiency.

Customer Partnership & Sustainability

By returning your core and its components, you help maintain a reliable supply chain, ensuring we can continue offering top-quality products at the best prices. This process not only benefits your wallet but also contributes to a greener and more efficient automotive industry.

We appreciate your support in keeping our business and the industry running smoothly!

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