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Old 12-02-2019, 11:23 PM   #1
Smitty
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Default Valve Grinding

Hi All,
I have been grinding some Model A valves with my valve grinder and am finding by the time I am able to get a clean face there is not a lot of margin left. These are stainless valves with 70k+ miles on the motor but valves have not been ground before. Never had this concern before with flatheads and SBC's, newer motors etc.
Anyone else experienced this?


Thanks, Steve
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Old 12-03-2019, 12:46 AM   #2
Russ/40
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Default Re: Valve Grinding

Don't know what your expecting, but with 70,000 miles, I would not grind them I would trash them. Valves are not that expensive. If you run a thin lipped valve, it is more likely to burn in the future. Also stem wear is likely. I wouldn't bother with them. JMO
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Old 12-03-2019, 12:47 AM   #3
fordwife
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Default Re: Valve Grinding

I don't know the specs on a model a, but I've found that a 1/32" margin on most old cars is enough.
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Old 12-03-2019, 08:56 AM   #4
Patrick L.
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Default Re: Valve Grinding

Specs for a margin can be tough to define. Valves come in all sizes. But a good rule of thumb, if it ends up being 50% of that on a new valve then I trash it.
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Old 12-03-2019, 12:30 PM   #5
Kurt in NJ
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Default Re: Valve Grinding

Are they original Ford stainless valves?---- they have a pretty thin margin to begin with
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Old 12-03-2019, 10:00 PM   #6
Smitty
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Default Re: Valve Grinding

These are aftermarket, had to go a ways to get a clean face. Guess I should just change them out. Like upgrading a computer, you end up replacing everything in the end.
I have done a lot of motors over the past 50+ years, never had to go that far into the face to clean it up.
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Old 12-04-2019, 12:43 AM   #7
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Default Re: Valve Grinding

Depending on where your seat is you can also turn them to 90 degrees in you valve Facer and gain some margin. Just saying.
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Old 12-04-2019, 07:54 AM   #8
Patrick L.
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Default Re: Valve Grinding

Quote:
Originally Posted by Dodge View Post
Depending on where your seat is you can also turn them to 90 degrees in you valve Facer and gain some margin. Just saying.


Thats a good point. If the seat contact can be moved toward the stem you could maybe grind some more margin. I happen to like the contact area near the stem.
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