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Valve stem seals #3074341
09/04/22 11:00 PM
09/04/22 11:00 PM
Joined: Nov 2003
Posts: 9,334
Fort Worth, Texas
3hundred Offline OP
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3hundred  Offline OP
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Fort Worth, Texas
Guys, for street only engines, positive valve stem seals or standard umbrella? MANY years ago I ran teflon seals, seems like IIRC, after ~ 10,000 miles the guides were worn out? Wondering if things are different today? If you've already got positive seals can you just remove them and install umbrellas?

TIA


'68 Fury Convertible
'69 300 Convertible
'93 Ramcharger 5.7 Hemi
'93 Ramcharger 318 sold
'01 3500 4x4 Cummins 6 speed sold RIP bawling
'13 300 S sold
'15 Durango 5.7 Hemi
'16 300 S Hemi
Re: Valve stem seals [Re: 3hundred] #3074346
09/04/22 11:16 PM
09/04/22 11:16 PM
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Dcuda69 Offline
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Everything coming off the assembly line today has positive style seals on it....not necessarily Teflon but positive style seals. You also didn't mention what heads/guides/application. Iron, aluminum or ??

Last edited by Dcuda69; 09/04/22 11:17 PM.
Re: Valve stem seals [Re: Dcuda69] #3074351
09/04/22 11:24 PM
09/04/22 11:24 PM
Joined: Nov 2003
Posts: 9,334
Fort Worth, Texas
3hundred Offline OP
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Originally Posted by Dcuda69
Everything coming off the assembly line today has positive style seals on it....not necessarily Teflon but positive style seals. You also didn't mention what heads/guides/application. Iron, aluminum or ??


Just standard BB iron heads, 915, 906, 346 or 452, I think they're all pretty much alike save for the closed chambers of the 915's? I have access to any of them. My '69 (~ 60,000 miles) has never been apart, I'm sure the original nylon timing gear is beyond brittle and the valve stem seals in little pieces all over the engine.


'68 Fury Convertible
'69 300 Convertible
'93 Ramcharger 5.7 Hemi
'93 Ramcharger 318 sold
'01 3500 4x4 Cummins 6 speed sold RIP bawling
'13 300 S sold
'15 Durango 5.7 Hemi
'16 300 S Hemi
Re: Valve stem seals [Re: 3hundred] #3074359
09/05/22 12:25 AM
09/05/22 12:25 AM
Joined: Jun 2013
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Keizer, Oregon U.S.A.
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elmor353 Offline
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Keizer, Oregon U.S.A.
Street engine is good with stock type umbrella seals. Never had a problem using them.

Re: Valve stem seals [Re: 3hundred] #3074363
09/05/22 01:38 AM
09/05/22 01:38 AM
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Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Viton positive umbrella type work great on the street up scope wrench
Teflon not so much on the street down


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Valve stem seals [Re: Cab_Burge] #3074397
09/05/22 07:29 AM
09/05/22 07:29 AM
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usa
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lewtot184 Offline
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i use comp cams 504-16 big block chevy umbrellas for 3/8" valve stem, single spring, big block iron heads. inexpensive, easy to find, and work quite well. be sure to monitor your retainer to guide clearance.

Re: Valve stem seals [Re: 3hundred] #3074399
09/05/22 07:41 AM
09/05/22 07:41 AM
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nowhere
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Sniper Offline
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Originally Posted by 3hundred
Guys, for street only engines, positive valve stem seals or standard umbrella? MANY years ago I ran teflon seals, seems like IIRC, after ~ 10,000 miles the guides were worn out? Wondering if things are different today? If you've already got positive seals can you just remove them and install umbrellas?

TIA


That depends on the engine. Running any seals on a flathead is a bad idea.

Re: Valve stem seals [Re: Sniper] #3074400
09/05/22 08:02 AM
09/05/22 08:02 AM
Joined: Jan 2021
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rust belt
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Moparite Offline
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Quote
915, 906, 346 or 452, I think they're all pretty much alike


Don't forget some have hardened valve seats and others don't. You don't want to run them(non hardened) on today's gas with out hardened seats or the valve will wear into the head.

Re: Valve stem seals [Re: elmor353] #3074465
09/05/22 11:27 AM
09/05/22 11:27 AM
Joined: Jan 2003
Posts: 23,742
Rio Linda, CA
John_Kunkel Offline
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Rio Linda, CA
Originally Posted by elmor353
Street engine is good with stock type umbrella seals. Never had a problem using them.


iagree I would go with the silicone material.


The INTERNET, the MISinformation superhighway
Re: Valve stem seals [Re: 3hundred] #3074540
09/05/22 04:30 PM
09/05/22 04:30 PM
Joined: Nov 2003
Posts: 9,334
Fort Worth, Texas
3hundred Offline OP
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3hundred  Offline OP
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Fort Worth, Texas
Well, this is timely...FF to ~ 4:20



'68 Fury Convertible
'69 300 Convertible
'93 Ramcharger 5.7 Hemi
'93 Ramcharger 318 sold
'01 3500 4x4 Cummins 6 speed sold RIP bawling
'13 300 S sold
'15 Durango 5.7 Hemi
'16 300 S Hemi
Re: Valve stem seals [Re: 3hundred] #3074759
09/06/22 11:35 AM
09/06/22 11:35 AM
Joined: Jan 2003
Posts: 74,131
U.S.S.A.
JohnRR Offline
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JohnRR  Offline
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Originally Posted by 3hundred
Originally Posted by Dcuda69
Everything coming off the assembly line today has positive style seals on it....not necessarily Teflon but positive style seals. You also didn't mention what heads/guides/application. Iron, aluminum or ??


Just standard BB iron heads, 915, 906, 346 or 452, I think they're all pretty much alike save for the closed chambers of the 915's? I have access to any of them. My '69 (~ 60,000 miles) has never been apart, I'm sure the original nylon timing gear is beyond brittle and the valve stem seals in little pieces all over the engine.


Unless you have the guides tops machined the only thing that is going to work is the umbrella seal , if having the heads redone then machine for positive seal .


running up my post count some more .
Re: Valve stem seals [Re: JohnRR] #3075073
09/07/22 09:01 AM
09/07/22 09:01 AM
Joined: Jun 2008
Posts: 3,846
usa
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lewtot184 Offline
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'452 heads are the wild card with the larger intake guide boss. they did use a positive seal but i never considered it a good choice. i used to buy some positive seals for a 3/8" stem from Goodson (similar to the edelbrock seal) some years back. guide needs to be trimed to .625" to use them. to be honest i've never found any seal easier or more effective than an old umbrella in a stock or near stock build.

Re: Valve stem seals [Re: lewtot184] #3075076
09/07/22 09:11 AM
09/07/22 09:11 AM
Joined: Jan 2003
Posts: 7,712
Tulsa OK
Bad340fish Offline
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Tulsa OK
I have had the best luck with a Viton seal with a steel jacket. Everything that touches the valve and guide is Viton, but there is a steel sleeve around it. When I tried some seals that had a Viton seal to the valve but a steel sleeve to the guide(smaller OD) they leaked like it didn't even have valve seals. I have had the scenario with two different cylinder heads. The Viton with steel jacket has worked both times and the other style has failed.


68 Barracuda Formula S 340
87 "Chrysler" Conquest
Re: Valve stem seals [Re: 3hundred] #3075094
09/07/22 10:33 AM
09/07/22 10:33 AM
Joined: Jan 2003
Posts: 14,171
So. Burlington, Vt.
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fast68plymouth Offline
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If the guide bosses are unmolested, I’d just use whatever is listed for the application of the year for the heads your using.

As has been said, it will normally just be umbrellas....... except for the 452 intakes.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Valve stem seals [Re: fast68plymouth] #3075494
09/08/22 12:21 PM
09/08/22 12:21 PM
Joined: Dec 2012
Posts: 229
Alberta
4
440_Offroader Offline
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Alberta
I'm not sure if a stock big block valve guide has the same diameter a small block? I had a stock 360 and used 3300 series CAT valve seals on it and worked great. They're for a 3/8" valve stem and was a positive lock on a stock 360 valve guide. I know it's out of the norm, and might not be an option for some people. Just throwing out an alternative.







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