car has vacuum in the dipstick

[lilredss0287]

so i replaced a exhaust valve and a head gasket (in the rear) and i started it up....there was a very strong vacuum in the dipstick why is this??

ohh and im not sure if this is the reason why or not but i went to check on my pcv valve and it WASNT there!!!! i guess my mechanic forgot to put one in my new upper intake

[Reptile]

The PCV system is jacked up somehow. Better get that fixed.

[Sabrewings]

If there's no PCV valve, I think you found your problem.