Yup checked all the breathers out.
Some more background:

This all started after i changed the headgasket(tho ive done this a million times). However on this build i replaced ALL the valves, as i had one slightly bent and thought i may as well do the lot for peace of mind. However i never replaced any of the guides. Would this be cause for concern? I dont know how much CVH guides wear? There is minute play in each valve guide...