Indmar Thermostat Housing Gasket for Chevy Marine Engines

Restore a reliable seal at the thermostat housing with this Indmar thermostat housing gasket for Chevrolet-based marine engines. A fresh gasket helps prevent coolant leaks, improves temperature control, and supports consistent engine performance—ideal for routine service, winterization prep, or anytime the thermostat housing is removed.

• Product type: Thermostat housing gasket
• Brand/Vendor: Indmar
• Application: Chevrolet (GM) marine engine thermostat housing
• Compatible engine sizes: 4.3L, 5.0L, 5.7L, 7.4L (454), 8.2L (502), 8.1L
• Function: Seals thermostat housing-to-manifold/housing mating surface to help prevent coolant seepage
• Material/Style: Composite/fiber gasket (green)

Installation note: Ensure both mating surfaces are clean and flat before assembly. Torque fasteners to the engine manufacturer’s specification. Replace the gasket whenever the housing is removed.

FAQ:
Will this fit my Indmar Chevy-based engine? If your Indmar uses a Chevrolet/GM small block or big block in the sizes listed above, this gasket is typically the correct thermostat housing gasket. Confirm by matching the gasket shape and bolt-hole spacing to your housing before ordering.
Do I need sealant? Many applications install dry; use sealant only if recommended by your service manual.