Sierra 1500 2WD V8-5.3L (2008)
6. Tighten the camshaft retainer bolts.
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Tighten the first design hex head bolts (3) to 25 N.m (18 lb ft).
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Tighten the second design TORX(R) head bolts (4) to 15 N.m (11 lb ft).
7. Compress the timing chain tensioner guide and install the EN 46330 .