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Hello everyone
Anyone can tell me what is the torque value for 12.9 bolts on a b23 engine?
What kind of bolts most people use?
Regular 12.9 bolts
Or some original bolts from others engines fitted to redblock?

Thanks

I think Volvo had 110nm on the old B21:s that had 12.9 headbolts, but some people recommend 120nm for 12.9. Remember to use a harder washer as well.

And retorque them after a heat cycle.

Do you really need 12.9?

Im converting it to turbo
Using stock headgasket
Isn’t better to use 12.9?