Download ENGINE – 5.0L – NEW TORQUE-TO-YIELD CYLINDER HEAD BOLT KIT AND NEW PROCEDURES – SERVICE TIP FORD: 1988 THUNDERBIRD 1988-91 CROWN VICTORIA 1988-95 MUSTANG 1991-93 THUNDERBIRD LINCOLN-MERCURY: 1988 COUGAR 1988-90 TOWN CAR 1988-91 GRAND MARQUIS 1988-92 MARK VII 1991-93 COUGAR LIGHT TRUCK: 1988-95 BRONCO, ECONOLINE, F-150-350 SERIES ISSUE: In 1992, the type of cylinder head bolts used on the 5.0L engines was changed to the torque-to-yield bolts. Depending on the build date of the engine, the 1992 model year engines came with either torque-to-yield bolts or standard torque, not a combination of the two (2). In 1993, torque-to-yield bolts were used on all 5.OL engines. ACTION: Refer to the following for proper bolt identification, usage and torque specifications. ^ The two (2) types of bolts being used are physically different. Refer to Figure 1. ^ The standard torque bolt is a non-flanged hex head bolt. ^ The torque-to-yield bolt is a flanged head bolt. ^ The two (2) types of bolts may be used on any of the 5.0L engines.