Can glass bead damage good valve seats ?

I begin rebuilding a 263 Buick engine , Str8 .
For now I removed the head , checked the valves / seats , clean with coumpound , all is nice . The engine was rebuild before in 1995 , so I mostly check everything , just to be sure of what I have .

The head is really dirty , a lot of carbon inside , and the shape of the T siamese intake makes it hard to reach .

I can gl*** bead it at home , I have compressor , pressure pot , gl*** bead , cabinet , etc ..

Is there a risk to ruin the valve seats ?
Thanks a lot .

 

No, bead away, if the seats are in good shape, just lap them in afterwards with grinding compound. if they needed work anyways.... go get a full valvejob.

 

The machine shop will hot tank the heads anyway so save your work for something else.

 

Too late
This engine won t go to the machine shop for now .
It s been rebuild in 1995 and quite not droven .

So I don t take a big chance running it "as his "
Just dismanstel everything , check . Etc .

For the machine shop , I ll need a spare head 248 or 263 to port it , the first one will be quite stock .

Did it . The gl*** bead had already used , so was really gentle . More dust than sand , and I use a mosquito screen before the blast pot I have to check the seats with coumpound and Prussian blue , but if seems ok .
It s clean
The goal is a 263 in the 1938 on my avatar .
I began last week ..

 

i worked in a machine shop redoing heads.. we gl*** beaded the heads... they all ran great..

 

Now spend a lot of time cleaning the beads out of every nook and cranny. There is an oil p***age in that head that feeds the rockers. Beads will kill rockers and valve guides & stems in no time.

Dan

 

I ve used duct tape to block the oil and water p***ages , and wood for the valve guides, not so crazy