If you dont use hand tools often you should never trust the torque from impact wrench you should always recheck with tension wrench for correct torque specs
or at least hand tools such as breaker bar, spanner, ratchet
depending on what your doing up and diameter of bolt or studd for what application
Cylinder Head Bolt Installation
Factory
Method
For each cylinder head, start with head bolt numbered one.
In increasing number sequence (1-2-3-4), tighten the head bolt in three
stages.
1. Tighten each bolt to 7-9 foot pounds of
torque.
2, Tighten each bolt to 12-14 foot pounds of
torque.
3. Mark each head bolt and head with aligning marks. Tighten
each bolt 1/4 turn (90 degrees).
Cylinder Head Bolt Installation
Torque
Wrench Method
For each cylinder head, start with head bolt numbered one.
In increasing number sequence (1-2-3-4), tighten the head bolt in four
stages.
1. Tighten each bolt to 7-9 foot pounds of
torque.
2. Tighten each bolt to 12-15 foot pounds of
torque.
3, Tighten each bolt to 22-25 foot pounds of
torque.
4, Tighten each bolt to 38-42 foot pounds of torque
Good luck, i hope this helps.
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