We must remember that muscle car makers often detuned an engine to fit into a range, as car makers do all over the world. eg BL Group SD1 ~ the Triumph designed OHC 2600 made the same HP as as the aluminium Rover V8 so the engineers detuned it to fit into the range Rover SD1 2000, Rover SD1 2300, Rover SD1 2600 Rover V8 in 30hp steps.
