General Motors has discontinued the Chevrolet LS7 crate motor, according to a recent report from Road & Track. Part of Chevrolet’s prolific series of Gen III small-block V-8 engines, the naturally aspirated LS7 displaces 7.0 liters (or 427 cubic inches) and produces 505 hp and 470 lb-ft of torque in stock trim. It featured in halo products…