hi just realised when i rebuilt my engine i used the uprated 12.9 head bolts but only tightened them up to the original torque settings, will this be ok? or are you meant to tighten them more?? i thought they were uprated meaning they were stronger not because you can tighten them up more to make a better seal. would you reccomend tightening them some more or leaving them as the book says?
