Aluminum Billet Water Neck for LS Engines Thermostat Housing

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Aluminum Billet Water Neck for LS Engines Thermostat Housing * Billet Machined Aluminum 6061-T6 * Accept GM Factory Original Thermostat * Clear/Black Anodized finishing It Fits:  All LS Engines All years Item Code Finished  Hose   181421-100 Clear 20AN Straight Up 181421-200 Black 20AN Straight Up 181422-100 Clear 20AN 90 Degree 181422-200 Black 20AN 90 Degree 181423-100 Clear 1.5″ Straight Up 181423-200 Black 1.5″ Straight Up 181424-100 Clear 1.5″ 90 Deg...