For GM LS LS1 LS3 4.8 5.3 Cylinder Head Coolant Steam 4 Port Crossover Hose Kit

Not compatible with "car" intakes, such as LS1, LS3, LS4, LS6, LS7 Camaro / Corvette. 4 Port Coolant Steam Crossover Hose Kit. To install, bolt the coolant ports to the heads. Now wrap thread tape on the NPT threaded ends of each hose, then thread into coolant port and tighten.

eBay