Detroit 6-71, Valve Covers, (GOOD USED) 1985 OEM Detroit 6-71 Valve Cover/Rocker Arm Cover 5103738 For Sale, 12V, Part # 5103738, Family Number FGM0426DAF2, Model 6L 71N, HP 239, CID 426, Stock # 6566 | Tested & Inspected!