New Pair 4.3L Mercruiser Marine Vortec Cylinder Heads # 113 Casting

New GM Chevrolet 4.3L Mercruiser Marine Vortec Cylinder Heads #113 Casting (Pair)

Premium New Marine and Automotive Replacement Cylinder Heads

Restore your engine’s peak volumetric efficiency and thermal performance with this matched pair of brand-new aftermarket cylinder heads, specifically engineered for the GM 4.3L V6 engine series. Featuring the heavy-duty #113 casting identifier, these heads provide a precision-machined solution designed to meet or exceed original equipment (OE) dimensional tolerances. Unlike remanufactured units that may have already undergone multiple thermal cycles, these “zero-hour” castings provide a fresh structural foundation, eliminating the risk of previous fatigue or micro-cracking common in high-mileage iron heads.

This cylinder head pair arrives “Fully Loaded” and ready for immediate installation, pre-assembled with high-quality valves and calibrated springs to ensure a seamless “drop-in” experience for both banks of your engine. Engineered for versatility, they are a direct-fit solution for both automotive and marine applications, providing the structural durability required for high-torque towing and sustained high-RPM operation on the water. Each unit undergoes a rigorous factory inspection protocol—including precision deck surfacing and high-pressure leak testing—to guarantee absolute deck flatness and a superior head gasket seal across the entire engine block. Whether you are maintaining a Chevrolet Silverado or a Mercruiser/Volvo Penta marine engine, this #113 head pair provides the mechanical reliability necessary to regain your 4.3L’s original performance.

🛠️ In-House Machining Process

• Debris-Free Preparation: Every new casting is chemically cleaned and blown out to remove all residual machining oils, metal shavings, and manufacturing debris. This ensures your oiling system remains uncontaminated from the first start-up.

• In-House Precision Machining: Unlike “shelf-stock” heads, we perform all final machine work in-house. This includes final guide sizing and precision valve seat cutting to ensure perfect geometry and clearances before the head reaches the assembly bench.

• 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 that could compromise the cooling or oiling systems.

• Dimensional Inspection: Our technicians perform a multi-point inspection of the gasket-sealing surface and bore alignment. This ensures the head is perfectly flat and meets tight OEM tolerances for a flawless fit.

• Professional Assembly & Setup: Valvetrain components are installed and verified in a clean-room environment. We check spring heights and seal seating to ensure the assembly is balanced and ready for high-performance use.

• 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 Size: 4.3L V6
• Casting Number: 113
• Material: High-Strength Cast Iron
• Condition: Brand New
• Configuration: Fully Loaded (Includes Valves and Springs)
• Compatibility: Vortec (8-Bolt Intake Manifold)
• Quantity: Pair (Two Cylinder Heads)
• Core Return Required
• Each Cylinder Head Includes: Valves and Springs Installed

🚛 Fitment Data

Common Applications:

• Chevrolet Astro: 2000–2005 Chevrolet Astro (4.3L V6)
• Chevrolet Blazer S10: 2000–2005 Chevrolet Blazer S10 (4.3L V6)
• GMC Jimmy S15: 2000–2005 GMC Jimmy S15 (4.3L V6)
• Oldsmobile Bravada: 2000–2001 Oldsmobile Bravada (4.3L V6)
• GMC Envoy: 2000–2000 GMC Envoy (4.3L V6)
• Chevrolet Express 1500 Van: 2003–2014 Chevrolet Express 1500 Van (4.3L V6)
• Chevrolet Express 2500 Van: 2003–2006 Chevrolet Express 2500 Van (4.3L V6)
• Isuzu Hombre: 2000–2000 Isuzu Hombre (4.3L V6)
• Chevrolet S10: 2000–2004 Chevrolet S10 (4.3L V6)
• GMC S15: 2000–2004 GMC S15 (4.3L V6)
• GMC Sonoma: 2000–2004 GMC Sonoma (4.3L V6)
• GMC Safari: 2000–2005 GMC Safari (4.3L V6)
• GMC Savana 1500 Van: 2003–2014 GMC Savana 1500 Van (4.3L V6)
• GMC Savana 2500 Van: 2003–2006 GMC Savana 2500 Van (4.3L V6)
• GMC Sierra 1500 Pickup: 2000–2006 GMC Sierra 1500 Pickup (4.3L V6)
• GMC Sierra 1500 Pickup: 2007–2007 GMC Sierra 1500 Pickup classic style (creased door skin) (4.3L V6)
• GMC Sierra 1500 Pickup: 2007–2007 GMC Sierra 1500 Pickup new style (smooth door skin) (4.3L V6)
• GMC Sierra 1500 Pickup: 2008–2013 GMC Sierra 1500 Pickup (4.3L V6)
• Chevrolet Silverado 1500 Pickup: 2000–2006 Chevrolet Silverado 1500 Pickup (4.3L V6)
• Chevrolet Silverado 1500 Pickup: 2007–2007 Chevrolet Silverado 1500 Pickup classic style (creased door skin) (4.3L V6)
• Chevrolet Silverado 1500 Pickup: 2007–2007 Chevrolet Silverado 1500 Pickup new style (smooth door skin) (4.3L V6)
• Chevrolet Silverado 1500 Pickup: 2008–2013 Chevrolet Silverado 1500 Pickup (4.3L V6)