Toledo Hall valve seat grinding

[Carnut1]

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Ok, sent to me by my international customer who is a fellow ST member. He bought it and figured I could try it and store it while he gets shop set up. I did a bit of cleaning and oiling looks like a really nice piece very low hours and well cared for. No instructions included so any help setting it up, making radius stones, or proper safe usage would be greatly appreciated. Thanks, Charlie

[Carnut1]

I would love to have a discussion on chamber radius shapes as well. If you look at the stone dresser you can see it follows a cam that can be changed out for different stone radius. Thanks, Charlie

[Frankshaft]

That's pretty sweet. Looks HEAVY though. lol. It must be supported somehow? I have never seen one in person or used one, but they say they are nice. Can you still get stones for them? Or the diamond dressing tool. That would be my concern.

[winterhoff]

Hi there i purchased the VIP grinder and there smaller one new back in the late 60s and sold them to a guy in Canada about 5 years ago . If you want some input good and bad on how to use them you can call me
636 447 4042
Ron

[modok]

It's an "eccentric" grinder. Goes round and round slightly off center of the pilot. Very neat tool.
Very large diameter valve seats are still done this way, as there really isn't any better way. A bit cumbersome for car size stuff. Not a big money maker, especially now that everything uses tiny stem sizes.....not even really practical for tiny stems..... but still a great find.

[Carnut1]

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Suffering from some Florida heat exhaustion today so not sure how much I will acccomplish. Went through stones and pilots last night. I can see how this design is better towards bigger valve sizes and valve stem sizes. I thought this stone was of interest, 1.88" bbc bowl radius. Looks like the past owner used radius on intakes as well. I wouldn't, I would stick to angles on the intake and a radius on exhaust. Thanks, Charlie

[Warp Speed]

We used one similar (Waterbury/Hall) to do exhaust seats for our super stock cars back in the late 80s. Of course we tried it on the intake too, with regular top cuts, but didn't work to well.
Cool old tool, but time has moved on............

[Carnut1]

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Found a 450 305 head that was still 1.72" valves so perfect to try this grinder out. Opened to 1.94" I was a bit paralyzed due to missing 5/16" diamond on straight angle cutter. Sioux are 3/8 ". This is a nice machine but it is not fast and it is a shoulder workout. I can see the ability to make an exhaust bowl radius a plus but that may be it. Small diameter valve stems will not work well because that is the only support for motor. Deshrouding the chamber is possible but very slow. Thanks, Charlie

[Carnut1]

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It does a nice job on inside radius cut.

[Frankshaft]

So do you dress the stone to form the radius and seat and top cut like a typical multi angle or radius cutter? Or are they separate stones like a typical stone grinder?

[Carnut1]

So do you dress the stone to form the radius and seat and top cut like a typical multi angle or radius cutter? Or are they separate stones like a typical stone grinder?

Multiple stones.

[6.50camaro]

Charlie, or anyone do you know where to get stones for a Hall EJ seat grinder they look similar if not the same to the one you posted. Dan

[Carnut1]

I don't. The owner of this piece is hard at work finding stones. This kit came with three boxes of stones.

[mag2555]

Just keep in mind that in regards to the Intake side of things that sharp defended angles used in the valve job and for about a 1/4" on down into the bowl help to sheer up wet flow and make for greater power on average even though ultimate air flow numbers may be better with gracefull radiused curves like you can cut with that Hall!

That being said that's a nice tool to have in your Arsenal!

[Carnut1]

Just keep in mind that in regards to the Intake side of things that sharp defended angles used in the valve job and for about a 1/4" on down into the bowl help to sheer up wet flow and make for greater power on average even though ultimate air flow numbers may be better with gracefull radiused curves like you can cut with that Hall!

That being said that's a nice tool to have in your Arsenal!

I did experiments with radius on lower angles on the intake many years ago. They ran well but after much advice similar to your advice I stick to angles on the intake but like a radius on the exhaust.