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Author Topic: Intake valve stem seals or not  (Read 4273 times)

Offline msundstrom

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Intake valve stem seals or not
« on: February 10, 2015, 10:43:08 AM »
Intake valve stem seals or not on a NA iron head application. Have run with them both ways and have not seen any advantage or disadvantage as long as VS clearance is good. Experiences, observations?
Thanks
Mark S
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Offline masracingtd1167

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Re: Intake valve stem seals or not
« Reply #1 on: February 10, 2015, 02:42:01 PM »
I would say yes to using valve seals because it will help keep oil out of the combustion chamber that can cause detonation .
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Offline wideopen231

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Re: Intake valve stem seals or not
« Reply #2 on: February 17, 2015, 09:05:18 AM »
Have never ran seals on race engine. Probably not worst idea just never have.
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Offline Frontenginedragsters

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Re: Intake valve stem seals or not
« Reply #3 on: February 17, 2015, 05:43:11 PM »
Naturally Aspirated engines have vacuum on the intake side and will want to suck oil down the valve stem.
The exhaust side has lots of heat and pressure pushing the oil up and out of the valve guide.
I would put seals on the intake side and question seals on the exhaust side.

Matt
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