2001 Workhorse Custom Chassis W22 Engine: 8.1L V8 GAS; Fitted with a high-quality Japanese NTN/NSK bearing; Position: Serpentine;. 2002 Workhorse Custom Chassis W22 Engine: 8.1L V8 GAS; Fitted with a high-quality Japanese NTN/NSK bearing; Position: Serpentine;.