1986 Western Star 4900 Engine: 10.5L -6 DIESEL; Position: Lower;. 1986 Western Star 4900 Engine: 10.5L -6 DIESEL; Position: Upper;. 1987 Western Star 4900 Engine: 10.5L -6 DIESEL; Position: Lower;. 1987 Western Star 4900 Engine: 10.5L -6 DIESEL; Position: Upper;.
