Engine - Cylinder Head Bolt Breakage
Bulletin 84-6-25Date Mar. '84
Ref. No. 84-127-6
SUBJECT: 5.0L V-8 (VIN CODE Y) GAS ENGINE HEAD BOLT BREAKAGE
MODELS AFFECTED: 1984 LESABRE, ELECTRA & RIVIERA
HEAD BOLT:
A limited number of 1984 5.0L V-8 gas engines may have been built with head bolts which may vary in hardness. The bolts are from one of the batches of bolts marked "F" on the bolt head. See illustration. If an instance of head bolt breakage is encountered, head bolts marked "F" on the bolt head should be replaced in that engine, as well as the head gaskets.
Bolts marked "F" from dealer stock, WDDGM, or in an engine where bolt breakage has not occurred should be considered usable bolts.
Part number 22510580 for short bolts and part number 22510579 for long bolts are 5.7L diesel head bolts, which may be used in the 5.0L gas engine when replacement bolts are required.