GM Enhances Full-Size Trucks with 5.7L and 6.6L V8s for 2027 Silverado/Sierra

GM has unveiled two sixth-generation Small-Block V8s for the 2027 Silverado 1500 and Sierra 1500: a 5.7-liter L76 with 402 hp and 428 lb-ft, and a 6.6-liter L78 with 481 hp and 501 lb-ft. The 5.7L displaces 350 cu in, benefits from higher compression and tuned intake, and can tow up to 13,700 lbs (Silverado) or 13,500 lbs (Sierra). The 6.6L focuses on performance, rated at 9,700 lbs (Silverado) and 9,400 lbs (Sierra). Both engines use direct+port injection and will be built at Flint, with added capacity at Tonawanda and St. Catharines, and will arrive with the next-gen trucks later this year.