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Thread Tools | Display Modes |
01-28-2022, 12:28 PM | #1 |
Senior Member
Join Date: Feb 2021
Location: Perry Mo.
Posts: 491
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New valve guides
Hi all, Still rounding up the valve train parts for my 255 mercury motor. I'm looking at valve guides and see some are heat treated and prices vary quite a bit. Any thoughts on who's or what is the best for street use?
Thanks as always, Tim |
01-28-2022, 12:54 PM | #2 |
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Join Date: May 2010
Location: Canada Where it snows
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Re: New valve guides
SBI or Qualcast will work fine. What does your local machine shop sell?
R |
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01-28-2022, 06:37 PM | #3 |
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Location: Wa.
Posts: 5,421
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Re: New valve guides
Get anything that is on the high side of the tolerance on the OD. Put them in with high temp loctite and then put bronze sleeves in them. They will last longer than you then.
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01-28-2022, 07:12 PM | #4 |
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Location: Charlotte NC KiWi-L100 available here
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Re: New valve guides
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01-28-2022, 07:16 PM | #5 |
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Join Date: May 2010
Location: Canada Where it snows
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Re: New valve guides
You can also use green retaining compound an lock them in. Install bronze guides before you install them. That requires some bronze tooling but works good.
R |
01-28-2022, 07:50 PM | #6 |
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Location: Alberta Canada
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Re: New valve guides
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01-28-2022, 07:56 PM | #7 |
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Location: Wa.
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Re: New valve guides
Knurling the OD of guides is a poor choice. It will cut the heat transfer by as much as 30% due to the reduced contact area.
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01-28-2022, 11:16 PM | #8 |
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Join Date: May 2010
Location: Chester Vt
Posts: 8,881
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Re: New valve guides
I knurl the valve guide for hne valve stem. This tightens the clearance ti the stem but keeps then well lubricated. I also don't use the guide seal I coat the guide with RTv and install it, By the time you run the engine it will set up. Usingn Never seal on the exhaust will make the next person to dis assemble the engine very happy.
Gramps |
01-29-2022, 01:21 AM | #9 |
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Location: Orcas Island Washington
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Re: New valve guides
Ron, I love how you are always thinking of the next guy. That is admirable in theses days of troubled times.
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01-29-2022, 05:41 PM | #10 |
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Re: New valve guides
I'll second that.
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