2001 yukon denali 6.0 oil in cylinder 1 and 3

[nonickatall]

Here you see, as an example a valve, from my Escalade where oil comes down from the valve stem seals...

I change the valve stem seals as well..

If you know what you do, then you need approximate 3 hours for both sides... If you do it the first time it will take a little longer...

 

[tendempine]

I am planing on taking my gmc to someone that will test it and find out more. Thank you everyone for you input. Money is tight for me right now so it has taken awhile to be able to put some money into getting my gmc back.