GM 7.4L 454 CID V8 HIGH PERFORMANCE BASE MARINE ENGINE

BASE MARINE ENGINES

GM V8 7.4 L
454 HIGH PERFORMANCE

392 Horsepower Marine Engine

454 CID

Displacement 7.4 liter (454cid)

Cylinders V8

Propshaft HP 392

Operating RPM 4400-4800 rpm

Bore 4.25 in. (107.95 mm)

Stroke 4.00 in. (101.60 mm)

Compression 8.4:1

Engine Rotation Left Hand Only

Product information and specifications are subject to change without notice.
GM MARINE ENGINES
• Engine is shipped with High-rise intake manifold.

• Cylinder head features sintered powdered-metal exhaust valve seat inserts for durability.

• Cylinder head features an open combustion chamber with high-velocity, high torque ports and canted valves for excellent performance.

• Connecting rods are forged from 4340 SAE steel (shot-peened and magnafluxed) and use 7/16" large diameter connecting rod bolts.

• Crankshaft is forged from 1053 SAE steel with ground fillets and nitrided bearing journals for durability.

• Heavy-duty marine camshaft with hydraulic roller valve lifters provides maximum performance.

• High-silicon forged aluminum pistons for strength.

• Superior engine sealing system features one-piece viton rear main seal, one-piece oil pan gasket and O-ring rubber rocker arm cover gasket. Engine also features a composite graphite cylinder head gasket.

• Common rear face on all GM marine engines for easy hook-up with housing.

BASE MARINE ENGINES
GM V8 7.4 L 454 HIGH PERFORMANCE 392 Horsepower Marine Engine 454 CID Displacement 7.4 liter (454cid) Cylinders V8 Propshaft HP 392 Operating RPM 4400-4800 rpm Bore 4.25 in. (107.95 mm) Stroke 4.00 in. (101.60 mm) Compression 8.4:1 Engine Rotation Left Hand Only	Product information and specifications are subject to change without notice.	GM MARINE ENGINES • Engine is shipped with High-rise intake manifold. • Cylinder head features sintered powdered-metal exhaust valve seat inserts for durability. • Cylinder head features an open combustion chamber with high-velocity, high torque ports and canted valves for excellent performance. • Connecting rods are forged from 4340 SAE steel (shot-peened and magnafluxed) and use 7/16" large diameter connecting rod bolts. • Crankshaft is forged from 1053 SAE steel with ground fillets and nitrided bearing journals for durability. • Heavy-duty marine camshaft with hydraulic roller valve lifters provides maximum performance. • High-silicon forged aluminum pistons for strength. • Superior engine sealing system features one-piece viton rear main seal, one-piece oil pan gasket and O-ring rubber rocker arm cover gasket. Engine also features a composite graphite cylinder head gasket. • Common rear face on all GM marine engines for easy hook-up with housing.