Mishimoto Silicone Heater Core Bypass Hose for GM LS V8 5-Layer 3/4"-5/8"

Mishimoto Silicone Heater Core Bypass Hose for GM LS V8 — 5-Layer 3/4"→5/8" Upgrade your LS swap or racecar cooling system with a purpose-built bypass hose engineered for durability, fitment, and reliable coolant circulation when a heater core is not used. Durable 5-layer silicone construction resists heat, pressure, and aging for long service life. Tapered 3/4" to 5/8" design matches the inlet and outlet ports on GM LS V8 water pumps for a clean, secure fit. Keeps coolant flowing so the thermostat and entire cooling system operate correctly — preferred over port blocking to prevent overheating. Simple installation for LS swaps or track builds: a clean, compact solution to bypass the heater core without modification. Mishimoto Lifetime Warranty — backed by the brand’s commitment to quality and performance. Whether building a street/strip machine or completing an LS conversion, this Mishimoto bypass hose provides a reliable, OEM-friendly way to maintain proper coolant flow and cooling efficiency. Compact, robust, and built to last.