[DeTomaso] Best Cleveland Valve Stem Valve Seal ??

[B Hower]

Jack,
 
I checked some of my other un-assembled heads and found the outside of guide area to be about .600 at the base and the .530 you mentioned at the open end. But my present (The 7 Banger) Pantera heads have the diameter cut to .530 for about .350 down the guide. Then it steps back out to the original taper point and tapers on to the .600 base area. The seals are teflon inside and the rest is black. They have BAF 48 on them and maybe a logo that I don't recognize.
 
Bud #3400
 
 
 
 
--- On Sun, 5/1/11, JDeRyke at aol.com <JDeRyke at aol.com> wrote:


From: JDeRyke at aol.com <JDeRyke at aol.com>
Subject: Re: [DeTomaso] Best Cleveland Valve Stem Valve Seal ??
To: b.hower3400 at yahoo.com, detomaso at realbig.com
Cc: tpr at teampanteraracing.com
Date: Sunday, May 1, 2011, 7:00 PM


In a message dated 5/1/11 5:32:11 AM, b.hower3400 at yahoo.com writes:

> I need inputs on what is the present best valve stem seal and pt # of 
> same for 351C.
> 
I like 100% teflon seals (like Perfect Circle) that sell for about $1.50 
apiece thru Summit, Jegs and most speed and engine shops. There are other 
slightly cheaper seals in which only a ring around the valve stem is teflon with 
the rest being neoprene. They are a litle easier to install. With valve 
stem seals that snap tightly onto the end of the guides, you need to know what 
size guides the engine has. Stock was the 0.530" but many performance en
gines have had the guide ends cut down to 0.500" because the bigger seals will 
not fit inside some performance valve spring sets. 
The ones included free in overhaul gasket sets are umbrellas that do not 
seal, only keep 'rain' from falling on the guides and do not belong on a 
performance engine. The neoprene hardens over time in the hot oil, shatters and 
falls into the pan to jam up oil pump rotors & score pump housings. Here's an 
instance where you get what you pay for, and umbrellas are free.... My 2¢- 
J DeRyke
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