[Kohnke Rebabbitting]

On this post there seems to be that Hard Seats are getting a bad name.

There are many advantages to a hard seat.

The main reason is fixing a block surface so all the valves set on top of the block as when new. Then all is Equal, in intake gas charge, and Expulsion, if head chamber, and piston Height, and cam lift, is all the same.

If you use hard seats, and S. S. valves, you will not have valve burning issues. We build all blocks, Model T, A, and B's with all valve holes having hard seats.

If you use just the block, or cast iron seats, along with a soft valve. When the valve burns, and it is ALWAYS THE VALVE FIRST, that is when it takes the cast block, or cast seat with it.

We have built motors that had for many years, had heating problems. On pulling the head, what you seen, was a valve ground so far down in the block that the top of the valve was even with the top of the block! Like that they will Heat bad!

When you start grinding a valves seat, there is only on way for them to go, and that is down.

Another bad thing is putting in seats and having to sink the seats below the block surface so when surfacing you don't brake all the broach teeth out of the broach wheel. Your seats, and block surface should look like this. Picture below shows the way the seats should look after the block is surfaced. You will note that the seats were done badly, and Vern had to use a larger O.D., that hurts nothing, as you can see.

Plain and simple, if your Seats fail, your Babbitt fails, any machine work fails, crank ground off center, or off center in the block, bad, or no Radius in crank, its bad workmanship.

Nothing fails if done right with the machine work.

Herm.