What Valve Stem Seals?

[chademinent]

Small block LA top end rebuild, just wondering what type of seals you are all using.

 

[beanhead]

I have the new-age teflon type, they're working good..in a stock type rebuild with closer to factory cam lift I would use umbrella seals=no machining of the guide bosses needed, also work just fine. All depends on your build...and budget of course

 

[chademinent]

Good to know. I am doing a higher performance build with a Hughes Whiplash cam, so i was kinda wondering... Im about to send heads out to the machine shop so I figured I should ask.

 

[moper]

If the cam needs true dual springs, the shop will have to cut the factory guides down. That mandates a positive type seal. They're basically two: Teflon, and Viton. I've used both. Either will work, but both also require very good guides so the valve doesn't move around much. If the springs are singles with a dampener, you can run any stock type seals.

 

[dvw]

Comp cams blue seals work well with trimmed guides. Available in .500" & .530" guide boss sizes, 11/33" or 3/8" stem sizes.
Doug