Aircraft piston engines; replacement and spare parts for such engines and engine components, namely, accessory cases, adapters, arms, baffles, balls, bearing sets, bearings, bolts, brackets, bushings, camshafts, caps, clamps, clips, cold induction systems, connecting rods, counterweights, covers, crankcases, crankshafts, cutters, cylinders, data plates, dowels, elbows, engine kits comprising engine cylinders gaskets, and seals for making a fuel injection piston driven engine, fuel injection kits comprising fuel pump, manifold, and nozzles for making a fuel injector for a piston driven engine fuel pumps, gasket sets, gaskets, gears, guides, hardware, hoses, housings, keys, lifters, nipple assemblies, nuts, pins, pipes, piston pins, pistons, plates, plenums, plugs, plunger, push rods, retainers, ring sets, rings, rocker arms, rocker shafts, roto coils, screens, screws, seals, seats, shafts, shields, shrouds, socket, spacers, springs, stabilizers, straps, studs, sumps, thru bolts, thrust buttons, transfer collars, tubes, valves, and washers