Superior Automotive is located in Southern California having relocated in the 1990's from New York where Joe Jill had established Speedwin Engineering in 1960. Superior Automotive quickly gained a well deserved reputation as one of the finest state-of-the-art high performance automotive services, diagnostic and repair facilities in the U.S., just as Speedwin had from the 1960s through the 1990s.

Superior Automotive specializes in Engine Blueprinting, Cylinder Head Blueprinting, LS1 engines, LS2 engines, LS7 engines, Engine Dyno, Flow bench, Dynojet chassis Dyno, Carburetor rebuilding, Carburetor rejetting and many other highly specialized automotive services.