The HD variant is a heavy - duty light truck. It is a strengthened version of the Silverado / Sierra light - duty, and is available in the 1500HD, 2500HD, and 3500HD models. The 2500, introduced in 2000, offers a Vortec 6000 V8 with 300 hp (224 kW) at 5200 rpm and 360 lb ft (488 N m) of torque at 4000 rpm with a Hydra - Matic 4L80E four - speed automatic transmission. The 2500HD also offers either the LB7 Duramax V8 with 300 hp (224 kW) at 3100 rpm and 520 lb ft (705 N m) of torque at 1800 rpm, the LLY Duramax V8 with 310 hp (231 kW) @ 3000RPM and 605 lb ft (820 N m) @ 1600RPM, and the LBZ Duramax V8 with 360 hp (268 kW) @ 3200RPM and 650 lb ft (881 N m) @ 1600RPM. Also available is the Vortec 8100 V8 with 340 hp (254 kW) at 4200 rpm and 455 lb ft (617 N m) of torque at 3200 rpm.
what size engine is in a 2000 chevy silverado
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