The Merak’s V6 engine descended from the 2.7 L Tipo C.114, originally designed by Giulio Alfieri in 1967 for use in the Citroën SM, that was bored out to 91.6 mm (piston stroke remained 75 mm) to displace 3 litres (2,965 cc).
It was a chain-driven double overhead camshaft, 12-valve unit featuring an unusual 90° angle between the cylinder banks.
The lubrication system used a wet sump and an oil cooler. This V6 did not end its days on the Merak: it was later modified and made into the first ever production twin-turbocharged engine in the Biturbo, ending its career in the 1990s Ghibli after reaching the highest specific output of any production engine at the time. The powerplant was mounted longitudinally behind the passenger compartment, and joined through a single-plate dry clutch to a 5-speed, all syncromesh Citroën transaxle gearbox and a limited-slip differential.