GM Teases 8.3L Duramax 'Mongoose' to Challenge Ford in HD Diesel War
GM teases an 8.3-liter Duramax V8 turbo-diesel codenamed 'Mongoose' for the 2027 Silverado HD and Sierra HD, signaling a direct challenge to Ford's Power Stroke; exact horsepower and torque aren’t released yet, but GM says it will replace the current 6.6L Duramax and could debut with styling updates before year’s end.