Leyland PE166 engine

An image showing a 2.3 litre engine installed in a red Rover SD1 model
The 2.3-litre version installed in a Rover SD1

The Leyland PE166 (often referred to as the Rover-Triumph Straight Six) is a single overhead camshaft (SOHC) Straight-six engine developed by the Rover-Triumph division of British Leyland, and was exclusively used in the Rover SD1 (Rover 2300/Rover 2600) series of vehicles between 1977 and 1986.