How To Test If Bov Are Leaking?

[mitch32]

Hello,

I recently took off my BOV, there was rust on the flanges so I rewelded them and painted them. The BOV are AP BOV that look like HKS SSQV. I decided to test them but I don't think my method works, basically I blew in the BOV's inlet to see if they leaked. One of them seems to have a very slight leak if I blew hard. Now I'm wondering if when the BOV's are in the car if the vaccum line helps to fully shut the BOVs. How should I properly test the BOV's? Is it normal to have a very very small small leak when you blow in the inlet of the BOV?

Thanks in advance

Mitchell