Was there such a thing as factory installed dual pcv valves?
#1
Out of Line, Everytime😉
Thread Starter
Join Date: Dec 2006
Location: Melville, Saskatchewan
Posts: 8,969
Was there such a thing as factory installed dual pcv valves?
On the Olds 260 in my 70 Cutlass, both valve covers have had PCV valves and grommets. It looks like factory GM blue paint on the valve covers, just weird.
#2
Makes no sense - the PCV pulls air into the intake from the crankcase on one side, and from the air cleaner into the crankcase from the other side -- If it's pulling into the intake from both sides, where would the air be coming into the crankcase from?
- Eric
- Eric
#3
Olds used dual ventilation on W-30s and MT cars. This involved two breather pipes to the valve covers, however. There was still only one PCV valve that attached to the nipple on the intake valley. As Eric points out, there is no need for two PCV valves. Considering that your 260 didn't grow in that 1970, it's obviously been messed with.
#4
I recommend you return it to the factory setup- one PCV valve, one filter/ breather vented to the air cleaner housing.
#7
#10
Out of Line, Everytime😉
Thread Starter
Join Date: Dec 2006
Location: Melville, Saskatchewan
Posts: 8,969
Just strange that someone did this. The original 350 was seized supposedly. I am running the pcv valve to the proper port and the other I put the hose from the extra pcv valve to the breather filter in the air cleaner. I will probably just add a plumbing fitting. It didn't use or leak a drop of oil driving 500 km this weekend. It is surprisingly decent especially with the kick down working and with the open top on the air filter plus the dual exhaust.
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