Single Cylinder Head Assembly for 1996-2005 Chevrolet Astro 4.3L Vortec 12557113

Replace one compatible 4.3L Vortec V6 cylinder head with a new cast-iron assembly supplied with the valves and springs shown.

Compatibility and Application

For compatible Chevrolet/GMC 262-cubic-inch 4.3L Vortec V6 engines using casting reference 12557113, including 1996-2005 Chevrolet Astro applications when the original casting, intake pattern and rocker hardware match. The supplier broadly lists 1992-2014 automotive/marine engines, but that range is not a guarantee for every model or engine revision. Confirm the eight-bolt Vortec intake design and 8 mm rocker studs; early non-Vortec and newer direct-injection engine designs are not assumed compatible.

Product Details

• Includes 1 cylinder head assembly only, not a pair.
• Cast-iron construction with installed valves and valve springs as pictured.
• Engine family: 4.3L 262 V6; Vortec-style intake configuration.
• Rocker-arm stud size: 8 mm.
• Casting/reference number: 12557113; supplier part UY6JC3.
• New aftermarket replacement; gaskets, bolts and rocker arms are not included unless pictured.

Compare the original part, dimensions and mounting points before ordering. Professional installation is recommended. Confirm combustion chamber, coolant passages, sensor provisions, valve-train hardware and intake mounting against the original head before installation. Marine installations also require verification of the specific engine cooling and exhaust arrangement.