300 valve seals

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12-24-2010, 12:07 PM

sedly

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300 valve seals

I know umbrella seals are used but isnt there another
type of valve seal.
Maybe a positive seal?
If so,what is recomended?

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12-24-2010, 06:02 PM

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Hope this helps: <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w

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Valve seals: The umbrella seals are normally used when a larger-than-stock diameter spring is used. In the case of a double spring, the positive stop Teflon® seals are used. For triple-spring applications, use the smaller-diameter Viton® seals.

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12-25-2010, 05:50 PM

sedly

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Yes that helps.
Its interesting,when I pulled the head apart,the seals were half umbrella and
half(what I think)positive valve seals.
The positive seals were on the exhaust valves.And seemed to be in better condition
than the umbrellas.
The umbrella seals were hardened up and one of them had a chunk missing.

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12-26-2010, 02:07 PM

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That makes me wonder if that engine had a Crane cam in it, or a dual profile, where the exhaust will open less than the intakes. Or if the springs were different on int/exh., that would explain the seals.

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12-26-2010, 09:23 PM

sedly

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I thought maybe the cam was aftermarket as well.
Its a Ford part.I could run the #'s I guess and find out for sure though.
The exh. valves were carboned up the most.
The springs had thin spacers under all of them,all the same gauge.

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12-27-2010, 09:13 AM

BaronVonAutomatc

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Teflon seals are the way to go, those umbrella seals will eventually end up in pieces floating around in your oil.

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12-28-2010, 11:13 AM

sedly

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Quote:

Originally Posted by BaronVonAutomatc

Teflon seals are the way to go, those umbrella seals will eventually end up in pieces floating around in your oil.

Ya thats for sure.The old ones I removed were extremely brittle.
But only one had broke a piece off.
Which teflon seals do you suggest?

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300 valve seals

300 valve seals

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