Sierra 18-3668D Thermostat Kit for GM V6/V8 Engines 142°F

The Sierra 18-3668D Thermostat Kit is designed for marine applications on 1983 and newer GM V-6 and V-8 engines equipped with standard cooling systems. This complete kit includes a precision-engineered thermostat rated at 142 degrees Fahrenheit, along with the necessary gasket and O-ring for a proper, leak-free installation.

Key Features:

• 142°F thermostat opening temperature for optimal engine cooling
• Complete kit includes thermostat, gasket, and O-ring
• Designed specifically for GM V-6 and V-8 marine engines (1983 and newer)
• Compatible with standard cooling systems
• Display pack packaging for retail presentation
• Direct replacement for worn or failed thermostats

Regular thermostat maintenance is critical for marine engine performance and longevity. A properly functioning thermostat ensures your engine reaches optimal operating temperature quickly while preventing overheating. This Sierra replacement kit provides reliable temperature regulation to keep your marine engine running efficiently in demanding conditions.