Difference in 3.5L and 3.7L valve cover?
Junior Member
Joined: Jul 2025
Posts: 1
Hello
Not only do you have sparkplug seats to consider but also there is a difference in Positive Crankcase Ventilation PVC depends on the specific model and year. For example, the 2006 Hummer H3 3.5L does not have a traditional PCV valve; instead, it uses a system with hoses and an orifice in the valve cover to manage crankcase gases. Similarly, the 2006 Hummer H2 also does not have a serviceable PCV valve, as it is integrated into the valve cover where a 2007 HUMMER H3 3.7L will have a traditional PCV valve.
Super Moderator
Joined: Jul 2007
Posts: 13,056
From: Boat Town USA MI
Not only do you have sparkplug seats to consider but also there is a difference in Positive Crankcase Ventilation PVC depends on the specific model and year. For example, the 2006 Hummer H3 3.5L does not have a traditional PCV valve; instead, it uses a system with hoses and an orifice in the valve cover to manage crankcase gases. Similarly, the 2006 Hummer H2 also does not have a serviceable PCV valve, as it is integrated into the valve cover where a 2007 HUMMER H3 3.7L will have a traditional PCV valve.
NOPE, just wrong. H3s do NOT have any PCV Valve, none, doesn't matter which year it is.
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