K 2500 Suburban 4WD V8-5.7L VIN R (1999)
1. Install the new flange seals, the new nuts, and the new studs connecting the Y-pipe, catalytic converter assembly to the exhaust manifold.
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Tighten the studs to 22 Nm (16 ft. lbs.).
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Tighten the nuts to 64 Nm (47 ft. lbs.).
2. Position the Y-pipe and the catalytic converter assembly to the flat flange.
3. Install the nuts to the flat flange studs.
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Tighten the nuts to 64 Nm (47 ft. lbs.).
