Valves not seating/sealing RB25NEO

[BlackBox]

Hi,

Was just replacing my valve springs and seals on my RB25det Neo,
When i was pumping air into the cylinder through the spark plug hole i can feel a breeze coming out of the back of the turbo, the valve stays up and im not able to push it down. I tried disconnecting the air supply and moving the valve up and down, spinning it to try and dislodge any carbon holding it open but i can still feel air coming out of the turbo. I tried this on cylinder 1 and 2 and same result on both but worse on 1.
Is there anything im overlooking or am i going to need to pull the head off for valve regrind? If that is the route i have to take i would rather send it away for a full reco and port.
 

[KiwiRS4T]

Not quite sure what you are doing. When you say the valve stays up do you mean it stays open or it stays closed? Is the cam bearing on the valve at the time? If an exhaust valve is leaking it could be burnt.

[BlackBox]

When the valve is up it is closed, nothing is on the valve, the camshafts are removed.
With the spring out and compressed air in the cylinder the valve stays closed/up and I'm not able to push it down/open but I can feel air escaping past it and flowing out the turbo, even when I reinstall the spring the valve is still not seating and air is flowing out the exhaust

[KiwiRS4T]

Right so it need reseating at a minimum and replacing if it is damaged.

[BlackBox]

I will be pulling head off tomorrow to see exactly what it needs, but if its coming off for reconditioning then i want to get a basic port done aswell.. Only place i can find is lewis engines, does anybody have experience with them or recommend anywhere else?