Engine: Valve Stem Seal Preference

[Paul Keller]

Seems there are three (at least) forms of stem seals:
Umbrella: as w/ std Stude
Hat Type: high temp push-on seals
Positive Seals: Lock onto valve guide
The PVC umbrellas have already been ruled out - They should be replaced every 3,000-5,000 mi.
Have been told that the positive seals limit the lube to the valve stems which could result in accelerated guide/valve stem wear.
Any opinions as to which to use?
(289 engine w/ bronze guides and stainless valves for around town and "spirited" hiway driving)
As usual, thanks for all the help, Paul TK

[Mike Van Veghten]

For stock valve guides...just stick with the tried and true...umbrella style. Most of the other seals require a smaller guide diameter OR a larger spring.
You can get high temp. umbrella types also. Just better rubber and sometimes a protective coating around the hole for the stem.

Mike

[Paul Keller]

Thanks - That may be the safe way to go (have a couple requests posted w/ the mfr's - No reply as yet). The bronze guides are sized for positive seals.
Paul TK

[Bud]

I use the umbrella type seals and as long as the guides and valve stems are in good shape, they do a good job controlling oil running down the guides. Bud