Google-fu must be weak today, cuz I can't find a simple answer.

How many lbs of boost should a 100% stock VVT head see before the valve springs need to be upgraded? Not sure this would factor into the equation, but 8.6:1 CR & 7K redline FWIW.

 

Codrus’ bp4w and patsmx5 bp6d are the two off the top of my head that ran into valve float fwiw

 

To add to the question, how much more is safe with volvo Springs?

😁

 

allofit

 

In b4 colipto revs to 10k.