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FE Power Forums => FE Technical Forum => Topic started by: TomP on October 15, 2021, 05:36:33 PM

Title: smaller 3/8" umbrella seals ?
Post by: TomP on October 15, 2021, 05:36:33 PM: I am putting a pair of FE heads together and the springs are doubles... and won't fit the normal umbrella seals. Guides are too big for PC seals. Pretty sure i've heard of smaller 3/8" umbrella seals. Anyone know an applicaion or part number?
Title: Re: smaller 3/8" umbrella seals ?
Post by: pbf777 on October 15, 2021, 08:00:30 PM: Well, I don't have any dimensions of what you might really require but there is this:

GM UMBRELLA SEALS, 3/8"
Application: SB Chevy Truck Engines w/ 3/8" Stem exhaust valves

Specification Data:

Fits: 3/8" Valve Stems.
Inside Diameter, smallest point: .605”
Inside Diameter, widest point: .635"
Outside Diameter: .715"
Height: .450” Tall
Seal Material: Poly Acrylic
Material Temp Rating: 375F

AVAILABILITY: :-\

But I think, you might be barking up the wrong tree with this plan! :-\

Scott.
Title: Re: smaller 3/8" umbrella seals ?
Post by: TomP on October 15, 2021, 11:22:58 PM: Who'da thunk SBC's even had 3/8" valves! Thanks. I think those should be OK. Just two sets of them. Found a link with them and dimensions of others too. Some are larger PC seals. https://www.alexsparts.com/valve-seals-3-8/
Title: Re: smaller 3/8" umbrella seals ?
Post by: TomP on October 15, 2021, 11:36:54 PM: Actually these look ideal . late 80's 318 Mopar, PC seals with .640 ID https://www.alexsparts.com/3-8-positive-in-ex-seals-viton-sb-chrysler-318-360-1988-1991-3-8-x-640-vss-275/
Title: Re: smaller 3/8" umbrella seals ?
Post by: manofmerc on October 16, 2021, 05:18:59 AM: These pioneer #940 are probably to big but a really good seal for stock heads .I have used them on two engines and they work fine .I believe they came on buick v-6 engines .Good luck ! Doug
Title: Re: smaller 3/8" umbrella seals ?
Post by: pbf777 on October 16, 2021, 06:59:14 PM: Quote from: TomP on October 15, 2021, 11:36:54 PM
https://www.alexsparts.com/3-8-positive-in-ex-seals-viton-sb-chrysler-318-360-1988-1991-3-8-x-640-vss-275/

I'm assuming you realize that these seals you have listed are not an umbrella seal as was your first inquiry, and what your saying is that the current guide boss O.D. is within the acceptable values provided in the specifications of .640 - .650"? :-\

Scott.
Title: Re: smaller 3/8" umbrella seals ?
Post by: gt350hr on October 18, 2021, 01:06:30 PM: SBC Chevy/GM truck with sodium filled valves is the application.
Title: Re: smaller 3/8" umbrella seals ?
Post by: TomP on October 18, 2021, 02:04:39 PM: Parts store seems quite useless at finding anything. Any idea what years or truck models had them? Last time I did this the seals were just something I had already.
Title: Re: smaller 3/8" umbrella seals ?
Post by: manofmerc on October 20, 2021, 06:20:09 PM: Why not see if pioneer has a website?If you have a p.n. it would be easier than dealing with a parts store .That pioneer seal I mentioned I bought them from Jegs .I just gave them the p.n. and they sent me two sets .Or maybe an older machine shop would have some sitting around .Doug
Title: Re: smaller 3/8" umbrella seals ?
Post by: TomP on October 22, 2021, 04:38:26 PM: Yeah those Pioneer ones seem to be quite scarce too, but i found a common application.... BB Chivverlay with dual valve spring, like L88's. Local store can get those, FelPro number SS72513