92 buick century head bolt tighten sequence?also head bolt torque?also manifold? 3.3l v6 engine thanks

Question edited for clarity.
Question moved to model category.

All here for the three engine types

https://www.autozone.com/diy/repair-guides/nissan-frontier-xterra-1998-05-torque-specifications-repair-guide-p-0996b43f8037fa5c

https://www.google.com/search?q=2004+Nissan+Xterra.+cylinder+head+bolt+sequence+and+torque+specs

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limited info generic answer if looking for all specs then buy a repair manual multi sites online can download or hardcopy -

1. Tighten the cylinder head bolts in the sequence shown. Using the 4 step torque turn method, tighten according to the following values:

• • Step 1: All to 34 Nm (25 ft. lbs.)
  • Step 2: All to 68 Nm (50 ft. lbs.)
  • Step 3: All to 68 Nm (50 ft. lbs.)

CAUTION: Do not use a torque wrench for the following step.
Step 4: Turn an additional 1/4 turn

• Step 5: Install and tighten bolts (1-10) in sequence shown, to 41 Nm (30 ft. lbs.) .

1. Tighten bolts (1-10) again to 41 Nm (30 ft. lbs.) PLUS 1/4 turn in sequence shown.
2. Install main bearing bedplate to engine block bolts (11-20), and torque each bolt to 28 Nm (20 ft. lbs.) in sequence shown.

Connecting Rod Cap Bolts 54 Nm (40 ft. lbs.) + 1/4 turn
1997 Jetta: Torque settings..vw..the head, fly wheel, big ends.


1997 Jetta3 1800 feul injection


Vibration Damper/belt Pulley
Tighten 20 Nm (14.8 ft lb) Crankshaft Toothed Belt Sprocket Tighten 90 Nm (66 ft lb) + 90° Camshaft Sprocket Tighten 80 Nm (60 ft lb) Main Bearing Cap
Tighten 65 Nm (48 ft lb) FLYWHEEL TORQUE
Torque 60 Nm. (44 ft. lbs.) + 1/4 turn (90°) [1] [1] Always replace bolts.
CYLINDER HEAD TIGHTENING TORQUE [1] :
1st sequence: 40 Nm (30 ft lb)
2nd sequence: 60 Nm (43 ft lb)
Final sequence: plus 1/2 turn (180°)
Here are some additional specifications, thanks
ntake Manifold
Mounting Bolts 25 Nm (18 ft. lbs.) Bearing Cap Nut 20 Nm (15 ft. lbs.) Rod Bearing Cap
Assembly
Tighten 30 Nm (22 ft lb) + 90° To measure radial clearance
Tighten 30 Nm (22 ft lb) but NOT additional 90° TIGHTENING SPECIFICATIONS
Oil Pump Bolt 20 Nm (14 ft. lbs.) Oil Tube To Block 10 Nm (7 ft. lbs.) Exhaust Manifold to Cyl. Head 25 Nm (18 ft lb) Exhaust Manifold to Front Exhaust Pipe 40 Nm (30 ft lb) Water Pump
TIGHTENING SPECIFICATIONS
Cover Bolts 10 Nm (7 ft. lbs.) Mounting Bolt and Studs 20 Nm (15 ft. lbs.) + 1/4 turn (90°) Pulley Bolts 25 Nm (18 ft. lbs.)

TIGHTENING SPECIFICATIONS
Connecting Rod Nuts:
Tighten In Two Stages:
First Stage 30 Nm (22 ft. lbs.) Second Stage turn an additional 90°(1/4 turn)

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To install:

1. Install a new head gasket on the engine, making certain it is positioned correctly. The cylinder head dowel pins and the oil jet must be in place. Refer to the illustrations if necessary.
2. Install the head. Lower it straight down onto the block, aligning it correctly.
3. Apply clean engine oil to the bolt threads and the contact face of the bolt head. Install the head bolts finger-tight.
4. On all models except 1988-89 DOHC Prelude and 1992-95 Preludes with 2.3L and VTEC engines, tighten the head bolts following sequence A. On 1988-89 DOHC Preludes, use sequence B. Use sequence C on 1992-95 Preludes with 2.3L and VTEC engines.
   1. On 1984-89 Accords and 1984-91 Preludes, tighten the bolts in two passes. The first pass should bring the bolts to about 22 ft. lbs. (30 Nm). On the second pass, tighten the bolts to their final torque of 49 ft. lbs. (68 Nm).
   2. On 1990-93 Accords, tighten the bolts to 29 ft. lbs. (40 Nm) on the first pass, 51 ft. lbs. (70 Nm) on the second pass, then tighten the bolts to their final torque of 78 ft. lbs. (108 Nm).
   3. On 1994-95 Accords and 1992-95 Preludes, the bolts are also tightened in three passes. Tighten the bolts to 29 ft. lbs. (40 Nm) on the first pass, 51 ft. lbs. (70 Nm) on the second pass, then tighten the bolts to their final torque of 72 ft. lbs. (100 Nm).
      
      

      Fig. Fig. 9: Cylinder head bolt torque sequence A
      
      
      
      

      Fig. Fig. 10: Cylinder head bolt torque sequence B
      
      
      

      Fig. Fig. 11: Cylinder head bolt torque sequence C
      

   
   
5. If applicable, assemble the intake and exhaust manifolds to the head. Use new gaskets.
6. If applicable, install the cam, rockers and camshaft holders.
7. If equipped, install the EGR crossover and air suction pipes.
8. Connect the exhaust pipe to the manifold using new nuts.
9. Install the timing belt.
10. Install the valve cover.
11. Install the cylinder sensor (if equipped) and the distributor.
12. If applicable, install the alternator.
13. Install the power steering pump, then connect the inlet hose to the pump.
14. Install the accessory drive belts. Adjust the belt tensions.
15. Install the heater hoses.
16. Install the cruise control actuator if it was removed.
17. Connect the spark plug wires. Connect all the wire harnesses and vacuum hoses to the cylinder head, intake manifold and throttle body/carburetor.
18. Connect the throttle control cable and/or accelerator cable at the throttle body.
19. Connect the fuel lines.
20. Install the brake booster, PCV and charcoal canister vacuum hoses.
21. Install the air cleaner and intake duct.
22. Refill the engine coolant. It is recommended that the engine oil be changed whenever a cylinder head is removed.
23. Connect the negative battery cable.
24. Start the engine, allowing it to idle. Bleed the cooling system. Check the work area carefully for any signs of fluid leakage or any indication of the timing belt rubbing or slapping the covers.

hope this helps,

Torque sequence --------- front ' 6 1 3 7 ' of ' ' engine ' 8 4 2 5 ' --------- Step 1: torque bolts in sequence to 37 Ft/Lbs Step 2: torque all bolts in sequence an additional 120 degrees Step 3: torque bolts 1,2,3, & 4 an additional 30 degrees recheck final torque in sequence *** CAUTION ***engine uses Torque To Yield head bolts (TTY) thatpermanently stretch during the initial installation.New head bolts must be used when cylinder head isreplaced or re-installed to obtain proper torque.
always torque from center
Tighten each bolt an additional 90° in sequence.

Tightening sequence would be to tighten from the center most bolts to the outer most bolts.
Intake Upper Bolts = 18 lb.ft.
Intake Lower Bolts = 10 lb.ft.
Exhaust Manifold Nut = 12 lb.ft
Exhaust Manifold pipe = 22 lb.ft.
Exhaust Manifold Heat Shield = 18 lb.in.
Rocker Arm Torque Nuts = 18 lb.ft.

Hope this helped you ?? if you need more info, get back to me.....

on the 2.5 4 cylinder

step 1 18 ft lbs.

step 2 26 ft lbs. except bolt #9 re tighten it to 18 ft. lbs.

step 3 all bolts an additional 90 degrees.

intake manifold bolts 65 ft lbs.

on the 3.3L V6

step 1 35 ft lbs.

step 2 tighten all bolts an additional 130 degrees

step 3 tighten center 4 bolts an additional 30 degrees

intake manifold bolts 88 in. lbs.

Position the cylinder head on the cylinder block. Tighten the cylinder head bolts in 2 steps following the proper torque sequence. The first step is 37 ft. lbs. (50 Nm) and the second step is 68 ft. lbs. (92 Nm).

1. Install the cylinder head gasket. Ensure the arrows point towards the front of the engine. The left cylinder head gasket has the letter L stamped next to the arrow.
   
2. Notice
3. This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.
   
   
4. Install the cylinder head.
5. Install new cylinder head bolts. Tighten
   Tighten the cylinder head bolts to 50 N·m (37 lb ft) in sequence.
   
6. Use the J 36660-A to rotate each cylinder head bolt 120 degrees in sequence. Use the J 36660-A to rotate the four center cylinder head bolts an additional 30 degrees in sequence. Refer to Notice Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.