|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
01-19-2024, 07:53 AM | #1 |
Senior Member
Join Date: Nov 2010
Location: Lambsburg Va
Posts: 296
|
Exhaust guide seals
Should I use seals on the v8 flathead exhaust guides?
Thanks |
01-19-2024, 08:28 AM | #2 |
Senior Member
Join Date: May 2010
Location: upstate SC
Posts: 2,965
|
Re: Exhaust guide seals
no point, ford originally had two types of guides, one with a seal one without for exhaust
|
Sponsored Links (Register now to hide all advertisements) |
|
01-19-2024, 08:45 AM | #3 |
Senior Member
Join Date: May 2010
Location: Powell, TN
Posts: 2,509
|
Re: Exhaust guide seals
If you can get the guide with them on it in, go for it. I could not get them in on the last one I did.
|
01-19-2024, 04:46 PM | #4 |
Senior Member
Join Date: Nov 2010
Location: Lambsburg Va
Posts: 296
|
Re: Exhaust guide seals
Thanks
|
01-19-2024, 07:35 PM | #5 |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,070
|
Re: Exhaust guide seals
The original Ford guides from 49 - 53 has a "solid" guide on the exhaust side - there was no place to put a seal. Also, as the exhaust is under positive pressure, you don't have the issue you have on the intake side where the vacuum pulls oil from the valley into the port.
Sealing: The carbon from combustion will "seal the guide" on the exhaust side anyway - so the seal won't accomplish anything. And lastly, I like the solid exhaust guides as they do a better job of transferring heat from the exhaust valve into the cooling system (due to a larger contact surface area between the guide and the guide bore).. |
01-20-2024, 05:05 PM | #6 |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: Exhaust guide seals
Sponsored Links (Register now to hide all advertisements)
|
01-21-2024, 08:38 AM | #7 | |
Member
Join Date: Dec 2016
Location: Orchard Park NY
Posts: 93
|
Re: Exhaust guide seals
Quote:
|
|
01-21-2024, 10:25 AM | #8 |
Senior Member
Join Date: May 2010
Location: Liberty, KY
Posts: 901
|
Re: Exhaust guide seals
I have a question about the solid guides. Were they ever available through the parts department? When you look them up in the parts book it only shows the one number with the groove with a note to use the seal on the intake guide. I have never seen the solid guides NOS and have always got them used and bushed them. Thanks guys!
|
01-22-2024, 01:29 PM | #9 |
Senior Member
Join Date: May 2010
Location: Mill Valley,Ca.
Posts: 1,509
|
Re: Exhaust guide seals
I think that one good reason to NOT use the seals on the exhaust is they may be made impossible to remove later. This would be from the heat.
One experienced builder on here recommends RTV, a thin coating. Karl |
01-22-2024, 01:42 PM | #10 |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,070
|
Re: Exhaust guide seals
You can put RTV on the intakes . . . don't see it as necessary or doing any good on the exhausts. The carbon will seal them right up . . .
|
01-23-2024, 05:04 PM | #11 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: Exhaust guide seals
I've been using RTV for the past 50 years on all my buills. Just put alittle around the bottom of the guide before you install it and slide it in. Another thing I do isKnurl the guides. I just use a tool on the intakes. I bought the tool about 50 years ago place the guide in a lathe or vice runthe tool thru the guide, blow it out all done. Yes thery make better systens, but this works
Gramps |
01-24-2024, 09:46 PM | #12 | |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,070
|
Re: Exhaust guide seals
Quote:
|
|
01-25-2024, 02:36 AM | #13 |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: Exhaust guide seals
Knurling DECREASES the area of the guide in contact with the block. This slows heat dissipation from the valve. A bad thing.
Copper plating INCREASES the contact area to the block and along with superior heat transfer properties speeds the heat transfer away from the valve. A good thing. |
01-25-2024, 11:01 AM | #14 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: Exhaust guide seals
I don't Knurel the outside of the guide just the 341 hole in the middle, and copper plating cost money which is not necessary for a street engine.
G |
01-25-2024, 12:16 PM | #15 | |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,070
|
Re: Exhaust guide seals
Quote:
|
|
01-25-2024, 02:50 PM | #16 |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: Exhaust guide seals
The guides should PRESS in the block as in ALL modern engines, to insure an accurate long term valve seal, especially on a street engine.
Last edited by Pete; 01-26-2024 at 05:15 PM. |
|
|
Sponsored Links (Register now to hide all advertisements) |
|