Engines receive all new intake valves, all new exhaust valves, new valve springs, new retainers, hardened keepers and Fel Pro valve seals. All castings are magnafluxed and pressure tested. The head surface is milled to ensure a perfect mating surface. All valve heights are measured and adjusted. Each spring is pressure tested and each combustion chamber is vacuum tested for perfect sealing and compression.
Every bolt hole is tapped.
Cylinder heads receive 3 coats of high temperature paint. Step 6 Blueprint and final assembly. Each bore is checked with a precision dial bore gauge. Lifter bores are checked for size and correct clearance. Each lifter bore is polished with flap wheels to assure smooth lifter rotation.