quoted from auto speed magazine "But what gives the Lightning its real strength is the addition of a supercharger to the 5.4 litre Triton V8 engine. Already is an extremely potent engine generating 198kW, SVT engineers wanted to take Triton V8 to the next performance level. Since the engine block featured a 'deep skirt' design giving it greater rigidity, it was decided to boost performance with a supercharger. SVT engineers added a forged steel crankshaft, sinter-forged alloy connecting rods, and forged pistons, then lowering the compression ratio to 8.4:1 for the addition of the supercharger. Sequential injection, coil on plug ignition, alloy heads and a two valves per cylinder design with SOHC per bank are already standard." standard post 99 5.4s have hyperautectic pistons cracked cast rods and cast steel crank to the best of my knowledge and also states in this muscle mustangs article Ford Modular V-8 Engine - Crankshafts - Mustang & Fords Magazine