Spacer, GM LT4 Theromostat
E300033
Precision-machined spacer for GM LT4 thermostat applications. Ensures proper thermostat depth and sealing for consistent coolant flow and reliable engine temperature control.
This GM LT4 Thermostat Spacer is a precision-machined aluminum component designed to ensure correct thermostat positioning within the housing on LT4-based marine engines. Proper spacing is critical for maintaining a tight seal, accurate coolant routing, and consistent operating temperatures—especially in high-performance applications like Malibu’s Monsoon and GM-based powertrains.
Over time, heat cycles and service work can lead to improper fitment or missing spacers, which can cause coolant leaks, erratic temperature readings, or restricted flow. This spacer restores factory-correct geometry, helping your cooling system operate exactly as intended.
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CNC-machined aluminum for strength and corrosion resistance
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Ensures proper thermostat depth and sealing
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Supports consistent coolant flow and stable engine temperatures
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Direct replacement for GM LT4 thermostat setups
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Ideal for Malibu and other GM-based marine engines
A small part that plays a big role in keeping your engine running cool, efficient, and reliable on the water.
