GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 is an 477.7 in³ (7.83 L) internal combustion reciprocating V6 engine. It has bore/stroke ratio of 5.125 in × 3.86 in (13.018 cm × 9.8 cm), and uses 17.5:1 compression. This engine was rated 155 hp (115.58 kW) at 3200 rpm and 298 lbf⋅ft (404.03 N⋅m) of torque at 2000 rpm. It was used in Chevrolet and GMC cars.

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine performance rating according to SAE J1995 (SAE Gross) standard.
Parameter Output
Power Rating 170 hp (126.77 kW) at 3200 RPM
Torque Rating 310 lbf⋅ft at 2000 RPM
GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine performance rating according to SAE J1349 (SAE Net) standard.
Parameter Output
Power Rating 155 hp (115.58 kW) at 3200 RPM
Torque Rating 298 lbf⋅ft at 2000 RPM
GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine general specifications.
Parameter Value
Type Internal Combustion Reciprocating
Fuel Type Diesel
Cylinder Configuration V6
Engine Displacement 477.7 in³
Bore 5.125 in
Stroke 3.86 in
Compression Ratio 17.5:1
Firing Order 1-6-5-4-3-2
Curb Weight 950 lb

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GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine block, crankshaft and pistons specifications.
Parameter Value
Block Material Chrome-nickel alloy cast iron
Crankshaft Material Drop-forged steel
Piston Material Permanent mold cast aluminum, tin
plated
Piston Pin Material Tubular alloy steel
Connecting Rod Material Drop-forged heat-treated steel
GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine head and valvetrain specifications.
Parameter Value
Head Material Chrome-nickel alloy cast iron
Valvetrain Type OHV
Valves per Cylinder 2
Camshaft Material High-strength electric furnace iron
GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 air intake specifications.
Parameter Value
Air Intake Method Naturally Aspirated
GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 fuel injection specifications.
Parameter Value
Injection Type Multi Point
Injection Info Compression
GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 oil pump specifications.
Parameter Value
Oil Pump Rotor
Oil Pump Pressure 60 Psi
Oil Pump Capacity 16 US gpm at 3200 RPM
Units:
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