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Your cart is empty. Whether you’re doing an LS swap or building your LS-powered racecar, the Mishimoto Silicone GM LS V8 Heater Core Bypass Hose is the easiest and cleanest solution for bypassing your heater core.
Our bypass hose is constructed from heat and pressure resistant 5-layer silicone and tapers from 3/4"" to 5/8” to fit the “in” and “out” ports on your water pump. Bypassing the heater core with a bypass hose is the preferred method, as opposed to blocking off the ports. This allows coolant to flow for your thermostat to function properly and avoid overheating. As with all our products, the Mishimoto Silicone GM LS V8 Heater Core Bypass Hose is backed by our signature Mishimoto Lifetime Warranty.
Alex C.
Reviewed in the United States on March 26, 2025
Doesn’t fit well not designed with the proper radiusto slip over both ports. It bulges so trying another brand that measured correctly
Brian Rhoton
Reviewed in the United States on January 10, 2024
Great quality looks great too!
Fayssal A.
Reviewed in Saudi Arabia on October 30, 2023
Good quality, perfect fit
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