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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

Q: What is the bolt torque sequence for upper manifold bolts on 4.3 Vortec?

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The torque specifications, for a 4.3 liter engine manifold, is 45 pounds per square inch. Torque the manifold bolts in 15 pound intervals.

Install the lower intake manifold to the engine. Apply sealer, GM P/N 1052080 or equivalent, to the lower intake manifold bolts.Install the lower intake manifold bolts. Tighten the bolts in three steps:TightenTighten the bolts on the first sequence to 8 N·m (71 lb in).Tighten the bolts on the second sequence to 12 N·m (106 lb in).Tighten the bolts on the final sequence to 15 N·m (11 lb ft).I this is what you are looking for.GMmechanic@gmail.com

the sequence is the two center bolts on each side, the work your way outwards

Remove the intake manifold, exhaust manifold, and then remove the head. Scrap off the old gasket and install a new one. Reinstall the head and Torque the head bolts in the proper sequence. Reinstall the intake and exhaust manifold torque the bolts to the proper torque. This is a major repair and not for a novice to try.

Remove the intake manifold, exhaust manifold, and then remove the head. Scrap off the old gasket and install a new one. Reinstall the head and Torque the head bolts in the proper sequence. Reinstall the intake and exhaust manifold torque the bolts to the proper torque. This is a major repair and not for a novice to try.

Intake bolts should be torqued to 35 ft lbs in the appropriate sequence. There should be 12 total "intake" bolts

I just did an intake manifold job on a 1999 5.7L suburban. The intake manifold to the heads, note this sequence....from front to back on the passenger side 7,1,3,5......from front to back on the drivers side 8,4,2,6. Tighten # Tighten the bolts on the first pass in sequence (1-8) to 3 NÂ·m (27 lb in). # Tighten the bolts on the second pass in sequence (1-8) to 12 NÂ·m (106 lb in). # Tighten the bolts on the final pass in sequence (1-8) to 15 NÂ·m (11 lb ft). Use Loc-tite blue on these bolts and follow the above sequence and torque levels.

I FOUND THIS AT WWW.AUTOZONE.COM, CLICK ON VEHICLE SPECS . For your 1999 CHEVROLET TRUCK BLAZER 2WD: INTAKE BOLT TORQUE FOOT POUNDS (FINAL TORQUE) TORQUE LOWER MANIFOLD BOLTS TO 27 IN/LBS TORQUE LOWER BOLTS TO 9 FT/LBS TORQUE LOWER BOLTS TO 11 FT/LBS TORQUE UPPER MANIFOLD BOLTS TO 44 IN/LBS TORQUE UPPER MANIFOLD BOLTS TO 7 FT/LBS (TO TORQUE BOLTS & NUTS, START IN CENTER USING CRISSCROSS PATTERN)

65 ft/lbs

Incorrect torque pounds, or incorrect sequence of torque,improper gasket installation, foreign matter not allow gasket to properly seal or warped intake manifold or warped block

you can as long as you use your TBI heads if you want to use the vortec heads with TBI you will need a special intake manifold or a carb manifold with a adapter to mount your throttle body to the carb manifold heres some more info TBI heads will mount to the vortec block TBI intake manifold has 12 bolts vortec intake manifold has 8 bolts

in sequence torque bolts to 20nm, then again in sequence turn a futher 120 degrees, and again in sequence 120 degrees.