The Chevy 4.3L V6 engine is a cast-iron V6 with a 4.3-liter displacement. It typically features a serpentine belt system up front, powering accessories like the alternator and power steering pump. Early models used TBI/CPI intake manifolds with a distributor for ignition, while later Vortec versions often have MPFI and may use coil-on-plug ignition. It's known for its compact V-shape and is commonly found in trucks and SUVs.