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Hoppers Express Cylinder Heads can develop special cylinder heads to perform on street, strip, dirt or water in a one-off design. All modifications are carried out in our modern, state of the art machine shop. Hoppers Express Cylinder Heads have new high quality parts such as titanium valves or heavy duty forged steel, together with heavy-duty springs, retainers and collets and designed for high RPM. Oversized valves, performance porting and screw in studs are a specialty.