All bolts are heat treated, stress relieved, deburred and hand inspected. All external parts are inspected, painted and brought to the clean room for final check out and assembly. Step 5 Most cylinder head castings are replaced, if they are available, with new Edelbrock aluminum heads. But all heads receive hard seats for unleaded or regular fuel. 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.