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Valve grinding stones!

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Ron Ca.

05-12-2003 18:37:43




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What size Sioux valve grinding stones do I need for N exhaust and intake? What angle for basic valve grind? Is there a place on-line to purchase these items? Thanks in advance to all who respond!!!!! Ron Ca.




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Jag

05-12-2003 19:45:14




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 Re: Valve grinding stones! in reply to Ron Ca., 05-12-2003 18:37:43  
Ron the seat angle is 45 degrees and top is 30 degrees throat angle is 60 degrees. Use the top and throat to place and narrow seat in relationship to valve. Seat needs to be .060-.090 wide no wider. Goodson is the best place to get this stuff. Give them a call and they are very easy to deal with. Phone # is 800-533-8010
Good luck Jason



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Rich,NJ

05-13-2003 06:33:45




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 Re: Re: Valve grinding stones! in reply to Jag, 05-12-2003 19:45:14  
Nice to know that the stones are still available. When I first got my 8N It needed valve work badly.I couldn't find the stones so I was able to take some old valves and put drive pins in them. I then drove them with the electric drill. I also put small slots on the face to hold the compound.
This worked after a fashion. I soon discovered that whomsoever had done the valves before had somehow ground them off center and there was much correction to be done. Some valves were as .003-.004 off centers. Whether this was due to off center guides, guide wear, or excessive pressure towards the cylinder I never could figure out. The misalignment was consistent in that it gap was towards the cylinder. No stones and my homemade "Power Lap" was making this valve job "heck" so I went out and rented a set of carbide cutters and cleaned it up with them. Or so I thought. I've had the head off and I lapped them one more time. Yes! I use Prussian, "highspot" blue on them to check the seat contact. And it looks like I'm going back in for a fourth time. Really guys, this is not my first valve job! I did manage to end the backfiring through the carb, but you can hear one cylinder in the exhaust. Somebody's still leaking. How did the carbide cutter work? Well I found it a lot easier to use than the stones. And the clean up is a lot easier than having all that grinding dust to worry about. However, Don't put any pressure on the cutters, They have to ride the work gently. Any pressure and they will follow the seat and recreate its problems. I hope this helps. Rich

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