o ring type valve stem seals

Interesting! I've not seen them before.

Yes they will get pushed up the stem really they need to be installed right under the spring retainer they are designed to stop oil from running down the valve stem as the retainer can act as a small reservoir and funnel right down the stem and puddle on top of the guide. Some valve stems have a groove just for this o ring it will be just under the groove for the keepers.

(edit) not a useless item works well if used correctly if the valve does not have a groove for the o ring its really not the right kind of seal to be using but can be of some good if installed up against the bottom of the retainer.

Jeff

If a man is talking in the forest..........And theres no woman around to hear him.... Is he still wrong?

Larry, I concur. The most useless item I have ever seen. Most likely to perish, and get sucked down a pushrod hole. I use the Viton stem seals from Todd....... most excellent replacement!

If you're not on the edge............ you're taking up to much space.

Can somebody explain what good these are. The way I see it, when the valve opens they get pushed up the stem and there they sit.

well i dont really want to spend any money and i have these in the garage, well i have 7 not 8 as one split. so i will just use what i have on the intakes.

annoyingly i did have a proper top hat type set put i put them on a head that i refurbed and sold.

Are these the factory seals you are talking about or the Viton seals with the steel spring going around the body? 

I would personally use the Viton seals as they last 4x longer, work better and are comparable in price.

Secondly, I put them on both exhaust and intake and have had no adverse affects.  When I left them off of exhaust initially, oil was still getting down there and I'd get a puff out of the tailpipe after idling for a while.  That went away when I put on the full set of seals.  I don't think there is much credibility to the concern about not having enough lubrication when seals are used on exhaust - at least not when using the Viton.

Contact Todd Miller for the Viton seals:

http://www.austinamericausa.com/

 

"I drive a Mini. What are you compensating for?"

 I use them on both but if not intake only.

Spelling errors may be beer related

ok thanks. exhaust only yeah?

 They just go on the stem down against the guide.

Spelling errors may be beer related

So i am rebuilding my head so i can put the motor back together.

I am using all the bits and bobs i have in the garage and i have the o ring type stem seal. how do these fit on? do i just slide them onto the valve stem?

http://www.minimania.com/web/Item/2A879/InvDetail.cfm