Valve stem seal recommendations? L98
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Valve stem seal recommendations? L98
Any recommendation for valve stem seals (umbrella type) for '89 stock heads.
Looking at Summit / Jegs listing stem is 11/32, what is the stock OD ?
Have .500 + .530 listed.
Looking at Summit / Jegs listing stem is 11/32, what is the stock OD ?
Have .500 + .530 listed.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
I'm not sure about the stock OD; I was very satisfied with performance of the OEM seals and didn't want any fitment issues either so I got a complete set of uppers & lowers from my local Chevy dealer for around $60.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
Go with the Felpro "blue" seals. I also would suggest that you use the intake seals all the way around...use them on the exhaust too. 
This has been suggested many times in prior posts. I did this on my 85 ironheads and they worked great...NO PROBLEMS. I am now running new aluminum so I won't worry about that for awhile.
This has been suggested many times in prior posts. I did this on my 85 ironheads and they worked great...NO PROBLEMS. I am now running new aluminum so I won't worry about that for awhile.
Instructor
Joined: Apr 2005
Posts: 128
Likes: 0
machining
Many of those valve seal need the top of the valve boss machined to accept them.
Make sure you get stock replacements if your not removing the head and machining the boss.
I have aluminum head I had machined for teflon seals
then they snap on to the boss and the valve slides inside the seal.
Make sure you get stock replacements if your not removing the head and machining the boss.
I have aluminum head I had machined for teflon seals
then they snap on to the boss and the valve slides inside the seal.
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Thanks for the info.
Heads are "113s" on my old 95K motor.Didn't bother to change seals when ZZ4 cam / LT4 springs went in so now trying to solve smoke only at hot idle problem until new 383 built.
Embarrasing sitting the staging lanes with more smoke from exhaust than tyres.
Heads are "113s" on my old 95K motor.Didn't bother to change seals when ZZ4 cam / LT4 springs went in so now trying to solve smoke only at hot idle problem until new 383 built.
Embarrasing sitting the staging lanes with more smoke from exhaust than tyres.
