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Old 06-21-2016, 05:20 PM   #1
Special Coupe Frank
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Default Re-facing valve seats in block: seat angle ?

If refacing the valve seats in the block ( for new, Stainless valves, etc. ), is it worth-while to go for a 3-angle grind, or just stay with the original-style single-angle ?

Block is a diamond-block with hardened seats on the exhausts.

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Old 06-21-2016, 06:08 PM   #2
Ron W
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Default Re: Re-facing valve seats in block: seat angle ?

I went with 3-angle. I used at least 1/16 to 3/32 flat contact surface. Seems OK so far.
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Old 06-21-2016, 06:41 PM   #3
Patrick L.
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Default Re: Re-facing valve seats in block: seat angle ?

Original was a single angle ?


Three angles are needed and need to placed correctly for proper seat width [.060-.080" intake and .080-.090" exhaust]and location on valve face. There should be a lot of info in archives or search.

Last edited by Patrick L.; 06-21-2016 at 08:03 PM.
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Old 06-21-2016, 06:45 PM   #4
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Default Re: Re-facing valve seats in block: seat angle ?

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3 angles are needed to get correct contact . My experience has been you seldom need to narrow it from bottom mainly need the 60 and 45
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