that white seal-thing the guy is pointing at http://www.chevyhiperformance.com/chevyhighperformance/howto/p33068_image_small.jpg

thanx

Looks like the valve guide seal that I just had replaced on my car. Mine was coughing smoke on start up, now its clean as a whistle on start up with new guides.
Thats my 2 cents graemlins/thumbsup.gif

It's a Viton valve seal.

It's a Teflon valve seal.

I'll second, your second. It is a Teflon valve guide/stem seal.

Looks like a teflon, clamp-on valve seal to me. If I'm not mistaken, the tops of the valve guides need to be machined to use that type of seal.

Harlan.

thanx, im rebuilding a pair of vette heads and those things i want to replace.

My heads do not have any valve seals. Are you sure you want to use them?

Guido67SS ,

Stock heads a lot of times just have little black "O-rings" right under the retainers and keepers/locks that serve as something similar to a real valve guide seal.

They are not as effective as real guide seals but work well b/c of the millions of stock emgines that have used them.

They go in the lower valve stem groove and you have to be kinda careful installing them b/c you can crush and ruin them if the retainer and/or keeper squash them when you compress the valve spring to install everything. pdq67

And to reinforce pdq67's reply, the stock valve seal works with the stock spring/retainer cup on top of the valve spring. The Viton seal does not require the spring/retainer cup.