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For the 1999 GM 5.7 Vortec engine, the head torque sequence involves tightening the head bolts in a specific pattern to ensure even pressure across the cylinder head. Typically, the sequence starts from the center bolts and works outward in a crisscross pattern. The initial torque specification is usually set at 22 lb-ft, followed by a further tightening to 44 lb-ft, and finally, a final torque angle of 90 degrees. Always refer to the specific service manual for precise specifications and sequences.

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