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
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- 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)
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