[DeTomaso] Cylinder Heads leaking

[sean mundy]

 After a long hiatus, I am back working on my Pantera.  Latest issue is the engine is burning oil at about a quart every 300 miles.
My spark plugs don't look horrible but something is going on.  I re torqued the cylinder heads and intake manifold and made sure my pc valve was working.  I looked at my intake valves with an inspection camera and there is a lot of carbon buildup but I only have about 2k miles on the new aluminum heads.  I thought my valve seals may be leaking so I started removing the rockers on one side and tried to replace the Teflon valve seals on #8cyl with new Comp Cam Viton seals.  
I connected compressed air to the #8 spark plug hole to hold the valve up so I could remove the spring.   I don't think you are supposed to but I can hear air leaking from somewhere inside the engine.  It seems like I can feel a little air coming out of the top of the intake manifold with my carb removed.  I can't trace the air leak.   
Need some tips on what steps I should take at this point.  Thanks, Sean
 		 	   		  
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    After a long hiatus, I am back working on my Pantera.  Latest issue is
   the engine is burning oil at about a quart every 300 miles.
   My spark plugs don't look horrible but something is going on.  I re
   torqued the cylinder heads and intake manifold and made sure my pc
   valve was working.  I looked at my intake valves with an
   inspection camera and there is a lot of carbon buildup but I only have
   about 2k miles on the new aluminum heads.  I thought my valve seals may
   be leaking so I started removing the rockers on one side and tried to
   replace the Teflon valve seals on #8cyl with new Comp Cam Viton seals.
   I connected compressed air to the #8 spark plug hole to hold the valve
   up so I could remove the spring.   I don't think you are supposed to
   but I can hear air leaking from somewhere inside the engine.  It seems
   like I can feel a little air coming out of the top of the intake
   manifold with my carb removed.  I can't trace the air leak.
   Need some tips on what steps I should take at this point.  Thanks, Sean