Granatelli Motor Sports - High Flow Thermostats for GM Engines

Upgrade your GM LS or LT engine’s cooling performance with a Granatelli Motor Sports high-flow thermostat. Engineered to improve coolant circulation, optimize operating temperatures, and support consistent power output when it matters most. High-flow thermostats help reduce heat buildup under demanding conditions, making them an excellent choice if you’re experiencing elevated engine temps, running performance upgrades, towing, or pushing your vehicle hard on the track. These precision-fit units are designed specifically for GM applications, ensuring easy installation and reliable operation compared to generic replacements. Whether you’re daily driving in warmer climates, increasing horsepower with bolt-ons, or maintaining performance during spirited driving, a high-flow thermostat is a smart upgrade when your factory unit becomes restrictive or begins to fail. Backed by over 75 years of racing heritage and innovation, Granatelli Motor Sports has built a trusted reputation among enthusiasts and professionals alike for delivering proven, performance-driven components you can rely on.