Valves Leaking ?

[AMXguy]

I wanted to CC my new heads , my question is with new valves , seats and all is it normal for fluid to seep into the exhaust and intake ports while you're doing this?  in the matter in a couple minutes it seeped enough to get them damp. does this mean I have a problem or is it normal?

[Chryco Psycho]

if the springs are on you may have a problem , if the seats are brand new they should wear in & seal better ,or the seat could be out of round or the guides loose new or used

[AMXguy]

Yes springs are on, new seats, new  bronze guides and brand new valves.

 

[Chryco Psycho]

it will seat in

[AMXguy]

Thanks,  I wonder if a guy could put some grease or something under the valves to make sure the cc reading is accurate? I don't think it's leaking that bad but a cc isn't much.

[71chally416]

It's not normal for them to seep through. You probably have 100-110 lbs of valve spring pressure closed which should prevent that. You can do a quick "Quality control" check on the seats if you remove the springs and then pull each one closed sharply by the stem and see if any stick, or if they all easily open and close. If any stick closed (even a little) that indicates the valve head is wedging onto the seat because of valve seat run-out. 

[Kapteenikosmos]

You can also use the traditional suction type valve lapping tool to rotate the valve (without the springs ofcourse) on the seat. It should leave a narrow darkish ring on the areas where the valve head and seat contacts. This would show you if it is out of round etc. If the problem is minor, add some fine valve lapping compound and give it some turns. This is what I had to do on my previous daily driver with new seats & valves.

The machinist who did the seats had pretty poor tools and the valves were not actually even close for a good sealing. The guy was cheap so I didn't complain.

[Aussie Challenger]

  I always put a smear of grease on the valve seat face before CC ing a combustion chamber.
  Whenmodifying a used head I clean then check the CC of each chamber before any machining so I know how much or little needs to be removed so they are close before machining.