Product Details: The CRC FiberLock® Head Gasket & Block Repair is the perfect solution for sealing tiny gaps and fissures in your engine. This 32-ounce bottle utilizes nanotechnology to permanently seal any cracks or leaks in your engine, ensuring that your engine runs smoothly and efficiently. Not only does this product seal up any cracks, but it also helps to lower the operating temperature of your engine as it circulates through the cooling system. FleetPride is your First Click in Heavy Duty®.