O-Ring - Water Neck Gskt Chevy V8/V6/6.5L Diesel

The FEL-PRO 35710 Water Neck O-Ring is a purpose-made coolant seal for Chevy V8, V6, and 6.5L diesel engines. It is designed to create a dependable barrier between the thermostat housing water neck and the engine block, preventing coolant from escaping at the mating surface. A reliable water neck seal is essential for maintaining proper cooling system pressure and preventing engine overheating.

Constructed from a coolant-compatible elastomer, this o-ring maintains its shape and sealing force under the temperature and pressure conditions found in modern cooling systems. The precise cross-section and inner diameter match the groove dimensions of compatible water neck housings, ensuring a snug fit without excessive compression. This attention to dimensional accuracy reduces the risk of coolant seepage during cold starts and sustained high-temperature operation.

Whether you are replacing a leaking thermostat housing seal or performing a full cooling system overhaul, this FEL-PRO o-ring is a straightforward solution. It installs in seconds with no adhesive or sealant required, making it accessible to both experienced mechanics and first-time engine builders. Proper sealing at the water neck protects against coolant loss, helps maintain engine temperature stability, and contributes to overall vehicle reliability.