Cascade Crew

fiveoformula · Posted: Tue Jan 26, 2010 11:15 pm Post subject: valve seals

Replacing the valve stem seals on the bird soon. Are these what I want?
I bought umbrella seals from NAPA the other day, but im wondering if I should get these too.

http://www.summitracing.com/parts/FEL-SS72527/

Twilightoptics · Posted: Tue Jan 26, 2010 11:35 pm Post subject:

Umbrellas don't do shizzle.

You SHOULD have positive seals. Without pulling a valve cover you wont know for sure.

You'll need 16.

There are several sizes you got the 11/32" right for the valve stem, but the base where it hooks to the head can be .500, .530, .560 and more.

fiveoformula · Posted: Wed Jan 27, 2010 12:25 pm Post subject:

Ok so I'll take the umbrella's back and see if I can find these locally, sounds like I'll have to compare to the original for sizing still though right?

Twilightoptics · Posted: Wed Jan 27, 2010 4:49 pm Post subject:

Yup...

Need to know what diameter the valve guide is. I can't find any consistant information myself.

chevymad · Posted: Wed Jan 27, 2010 5:34 pm Post subject:

You should be able to order stockers. I know they just come in a headset if you buy one, so there must be some kind of catalogging somewhere.

fiveoformula · Posted: Wed Jan 27, 2010 10:11 pm Post subject:

That part number I posted is the same fel-pro between both summit and jegs.

chevymad · Posted: Wed Jan 27, 2010 10:14 pm Post subject:

Forgot felpro and gm like to use positive seals on the intakes only. Victor used to have positives for the exhausts as well. Supposedly made out of different material. I usually just use the same ones for both.

fiveoformula · Posted: Wed Jan 27, 2010 10:40 pm Post subject:

Is there an advantage to using different ones on the exhaust? lol I don't get why they'd do that.

chevymad · Posted: Wed Jan 27, 2010 10:43 pm Post subject:

The reasoning is that the exhaust doesnt have vacuum sucking the oil down the guide. Therefore only the o-ring is needed.

fiveoformula · Posted: Wed Jan 27, 2010 10:56 pm Post subject:

That makes sense, hopefully this is the cause of the firebird's blues, it's smoked a bit ever since I got it.

Twilightoptics · Posted: Wed Jan 27, 2010 11:04 pm Post subject:

Still need something though. Had a motor with 100 miles on it come in and the teflon seals... two of them were leaking down the stem into the exhaust port! lol

fiveoformula · Posted: Thu Jan 28, 2010 12:19 pm Post subject:

Wow, sucks for that guy. Unless he wanted a well oiled exhaust system. lol

DBL_TKE · Posted: Fri Jan 29, 2010 6:07 pm Post subject: