Clearwater Cylinder Head Ford 3. 0 OHV 7mm Small Spring Cylinder Head Please provide a cast number through email. If unsure about casting numbers call 1(800) 572-1963. Five year unlimited millage warranty. Repair and replace no labor. Brand new casting, assembled and inspected in house. No core returned required. For question, concerns and to confirm perfect casting please call clearwater cylinder head at 1(800) 572-1963.