LT1 Valve Stem Sizes?

[meissen]

OK, I got royally owned today... went to start assembling the heads and the valve stem seals I have are waaaaaay too small.

So now the question... Summitracing lists almost all of their valve stem seals as .530" - mine are .550" - .565" at the least (I've never read a micrometer, so maybe someone can give me a clearer estimate based off of the pics below).

Why are my valve guides so much bigger?

Outside Diameter of Valve Guide:


Inside Diameter of Stock(??) Valve Stem Seals:


Inside Diameter of Edelbrock 9758 inner diameter:

[Phantom409]

1st pic = .550
2nd pic= .550
3rd pic = .531-.533 Kind of hard to tell what line is lined up after the 10.

[Phantom409]

I have a set of heads out in my garage.
I'll go and check the dia. of the stock valve guid for ya

[Phantom409]

.558-.560 is what I get on a stock Valve Giude B.

[1BADAIR]

the stem /guide is 8mm i believe. Are you talking the outer diameter were the seal installs? The seal should be slightly smaller cause you have to pound them on

[meissen]

According to a guy on CamaroZ28, the aftermarket stem seals for the LT1 are all wrong - either .530 or .560 and neither are right for the stock guides.

I'm going to send Angie to the parts department on monday to get replacement stem seals straight from GM.

[Phantom409]

B, you might end up waiting 3-7 days from the dealer
They don't keep that stuff in stock.

[meissen]

Someone on camaroz28 gave me a part # for fel pro valve stem seals that work so I went to murrays and ordered another set. Crossing my fingers that this set will fit!

[Phantom409]