Automatic air bleed valve?

[Jenkosowls]

Can't really see the need unless pulling serious levels of boost I'm sure darren or ruan will be able to say what sort of pressures cause heads to lift on these. To me if a head is lifting even for a split secound and gases and fluids are mixing the heads gaskets not going to last long. Maybe if you are concearned about the head lifting then you may get away with refreshing the head bolts for oem replacements for sensible boost levels