Mercruiser Twin Inboard 454/340 Hp

FOR SALE Mercruiser Twin Inboard 454/340 Hp with trans velvet drive ratio 1.91.1. This engine great running and excellent condition.

The MerCruiser 454/340 hp (7.4L) is a classic big-block V8 inboard engine produced by General Motors and marinized by Mercury Marine. It was heavily used in twin-engine configurations throughout the 1980s and 1990s to push heavy cruisers and sport fishing boats.

Key Specifications

• • Engine Type : GM Big-Block V8, 4-stroke
  • Displacement : 454 cid / 7.4 Liters
  • Horsepower : 340 hp
  • Full Throttle (WOT) RPM : 4,200 – 4,600 RPM
  • Oil Capacity : 7 US Quarts (6.6 L) with filter
  • Cooling : Available in Raw Water or Closed-Cooling (freshwater) systems
  • Fuel System : Typically equipped with a marine carburetor (e.g., Weber 4V) or early throttle body injection (TBI)