Profile: Darcy Racing Specialties is engaged in making custom cylinder heads for street and racing applications. We deal with CNC cylinder head porting, CNC machining, cam design and profiling, in house water brakes, direct drive dyno and custom engine building. Our products include titanium valves, carrillo rods, titanium valve spring retainers, in and ex valve guides, venolia pistons, cylinder sleeves, billet rear pickup sump & billet chromolly rocker arms.