Mishimoto Silicone GM LS Heater Core Bypass Hose, Black - Fits Select 1997-2017 GM LS V8

Fits select 1997-2017 Buick, Cadillac, Chevrolet, Pontiac, and Saab models with GM LS-based V8 engines. For LS swap projects or dedicated race cars where a heater core is no longer utilized, the Mishimoto Silicone GM LS V8 Heater Core Bypass Hose provides a reliable, clean solution for coolant routing.

Unlike blocking off water pump ports, which can cause coolant stagnation and thermostat malfunction, this bypass hose maintains proper circulation. This continuous flow ensures your thermostat reads temperatures accurately to prevent overheating during high-performance use. Each hose is constructed from heat and pressure-resistant 5-layer silicone, specifically tapered to fit the standard 3/4-inch and 5/8-inch ports found on GM LS water pumps.

• Directly bypasses heater core ports on the water pump
• Tapered design fits 3/4" and 5/8" ports for a secure, leak-free seal
• Maintains critical coolant flow for proper thermostat operation
• Durable 5-layer silicone construction resists degradation from heat and pressure
• Mishimoto Lifetime Warranty
• Manufacturer Part Number: MMHOSE-LSHB-BK