It has been suggested that the LS6 was nominally substantially underrated, which was a common practice of American car makers; and that the engine actually produced well over as delivered from the factory. Indeed, the AHRA ASA (Showroom Stock Automatic) Class record-holding Chevelle LS-6 for the 1970 racing season posted a best-of-season trap speed of , which suggests something on the order of 350 "as installed" (SAE Net) HP for a car-and-driver combination. Indeed, "Super Chevy Magazine" conducted a chassis dyno test of a well-documented, well tuned, but stock 1970 LS-6 Chevelle and recorded 283 peak HP at the wheels – a figure that lines up quite well with the previously referenced 350 SAE Net HP figure.