For the headbolt question.
On finland few guys are running +30psi with stock headbolts, pulling near 250hv.
And havent read yet anyone blowing gasket, since they heat engine before driving correctly, and "cool" it after before shutting it down.
So my tip would be to update headbolts only if everything else is afforded before, injectors, seals etc,
and an good gasket. Original metallic gasket rocks.
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