Need to know the head bolts torch specs on 98 toyota v6

Heres the torque specs and the way to tighten the head bolts for your 1998 toyota sienna, hope this helps,
12 point bolts step 1- 40 ft lbs
step 2- additional 90 degrees
recessed bolt 13 ftlbs

For 1998 Toyota Truck Sienna 3.0L EFI 6cyl the Head Bolt Torque...

Torque Sequence
-------------------- Front | 7 2 4 6 | Of | 5 3 1 8 | Engine --------------------- | 5 3 1 8 | | 7 2 4 6 | ---------------------

Step 1 - 12 Point bolts: Torque to 40 ft/lbs
Steps 2 - 12 Point bolts: Turn 90 degrees
Steps 3 - Recessed bolts: Torque to 13 ft/lbs Recheck final torque in sequence

Caution: Engine uses torque to yield head bolts (TTY) that permanently stretch during initial installation. New head bolts must be used when cylinder head is replaced or re installed to obtain proper torque specification.

Hope this help (remember rated this post). Good luck.

Torque: 64 N–m (550 kgf–cm, 40 ft–lbf), make sure to tighten them in sequence