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What is the bolt torque sequence for upper manifold bolts on 4.3 Vortec?
Wiki User
∙ 12y ago
I take it you mean on a trailblazer/ envoy/ bravada..??
Ok.. standing on the right side of the engine, looking at the head/ valve train and the front of the engines to your left. Locate the centre of the engine roughly tween 3rd an 4th cylinder.. that's hole 1 nearest with hole 2 across... move to the left of centre 3 an 4, then right of centre 5 an 6, then go back to the left.. then right.. you get the idea.. when you get to bolts 11 an 12 the head changes shape to an oval end the bolts fitted to the outside are 16 an 17, with bolt 15 in the centre of the deck
torque settings
1st step tighten bolts 1 - 14 to 22in/lbs
2nd step.. tighten same bolts with additional 155 degrees of turn
3rd step tighten bolt 15 to 62in/lbs, plus additional 120 degrees of turn
4th step tighten bolts 16 an 17 to 62in/lbs, plus additional 60 degrees of turn
Wiki User
∙ 12y ago
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