Oldsmobile Engine >> CYLINDER HEAD BOLT TORQUE CAUTION
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Oldsmobile Engine >> CYLINDER HEAD BOLT TORQUE CAUTION
Cylinder Head Bolt Torque Caution For
1968-90 GM 5.0, 5.7L VIN Y, 8, B & R Engines
The AERA Technical Committee offers the following information regarding a cylinder head bolt torque caution for 1968-90 GM 5.0L, 5.7L VIN Y, 8, B & R engines. These engines were manufactured by Oldsmobile.
Reports of conflicting torque values listed in different manuals has added to the problem of finding the correct torque value for these Oldsmobile engines. The simplest way to find out what torque to use is measure the diameter of the cylinder head bolts that the engine you are working on is using.
5.0 & 5.7L 1980 through 1990 used ?" bolts, torque to 130 ft/lbs.
5.7L 1977 through 1980 used ?" bolts, torque to 130 ft/lbs.
5.7L 1968 through 1976 used 7/16" bolts, torque to 85 ft/lbs.
7/16 or .437 diameter bolts use 85 ft/ lbs. of torque and tighten in equence.
1/2 or .500 diameter bolts use 130 ft lbs. of torque and tighten in sequence excluding 1989-90 5.0L VIN Y engines.
Note: It is acceptable to drill the 7/16 bolt heads for use on a block using 1/2 bolts. To do so, just drill all cylinder head bolt holes out using a 9/16 bit to allow clearance for the ? bolts.
Caution: 1989 & 1990 5.0L VIN Code Y engines require torque to yield head bolts (TTY) and use a torque turn method of tightening. Follow the steps listed below for those ? bolts
1. First step Torque all bolts in sequence to 40 ft/lbs.
2. Second step Rotate bolts # 1-7 and #9 an additional 120°.
3. Third step Rotate bolts #8 and 10 an additional 95°.
The AERA Technical Committee
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