1996 GMC C2500 Engine: 7.4L V8 GAS Naturally Aspirated; EngineCode: L29; EngineVIN: J;. 1997 GMC C2500 Engine: 7.4L V8 GAS Naturally Aspirated; EngineCode: L29; EngineVIN: J;. 1998 GMC C2500 Engine: 7.4L V8 GAS Naturally Aspirated; EngineCode: L29; EngineVIN: J;.