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Grinding my own seats, how hard to oversize?

Old Nov 26, 2003 | 12:20 AM
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Grinding my own seats, how hard to oversize?

I have a valve grinding set that uses stones. How difficult is it to grind out the heads to an oversized valve (say a 1.50" to a 1.60" exhaust valve).

I have only lightly grinded on heads to clean up the seat.

Thanks
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Old Nov 26, 2003 | 04:42 AM
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ede's Avatar
ede
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i think it'd make more sense to replace the seat
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Old Nov 26, 2003 | 07:47 AM
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It's easy. Just port out the mouth of the seat to approx 85-90% of the valve diameter, then hit it with your seat cutting stone.
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Old Nov 26, 2003 | 09:52 AM
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Originally posted by 305sbc
It's easy. Just port out the mouth of the seat to approx 85-90% of the valve diameter, then hit it with your seat cutting stone.
Have you done this successfully?
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Old Nov 26, 2003 | 12:20 PM
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From: Fairview Heights Illinois
Car: 1986 Irocz
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.25:1
Originally posted by a73camaro
Have you done this successfully?
Yes up to 1.55" because those are the valves I was using. I see no reason an extra .025" on each side would be a problem.
I usually cut a wider seat anyway to give me room for better radiusing on the edges.
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