The LG5, or 6H, is an inline-six cylinder 7.8 L (476 cu in) engine. It is a commercial-grade vehicle engine and is currently operating in over 300,000 Isuzu and GM-built trucks, including the H-Series and T-series vehicles. It is mated to the Allsion 3000 and 3500 Series transmissions.
The following trucks use the LG5:

• Chevrolet T-Series
• Isuzu F-Series
• Isuzu H-Series

Specifications

• Engine description: 7.8L I6 Turbodiesel; 6H
• Displacement: 7.8L / 475.9 in³
• Bore and stroke: 4.53 / 4.92 (in.)
• Block / Head: Cast iron / Cast aluminum
• Aspiration: Turbocharged & Intercooled
• Valvetrain: OHC 4-V
• Compression: 16.0:1
• Injection: Direct; Denso Common-rail
• Power / Torque: 200 hp (150 kW) @ 2,200 rpm / 520 lb·ft (705 N·m) @ 1,450 rpm (Standard)
• Power / Torque: 275 hp (205 kW) @ 2,200 rpm / 860 lb·ft (1,166 N·m) @ 1,450 rpm (High-Torque Version)

 

time for a swap

 

Good Pulling truck engine !