<VV> Valve Seats

[Frank DuVal]

20 years ago I was having seats replaced on many Corvair engines. I had 
a shop ( actually it was called "The Shop") in Hopewell, VA do many 
heads for me. Maybe it is the humidity, and the seats were rusting out 
just like the car bodies! ggggg

Even back then although 140s were the main  culprits, turbos, 110s and 
95s all dropped seats. I have seen a 110 driven so long that the seat 
would no longer touch any aluminum part of the head...... but it was 
still hanging on the intake valve. That was about 1980. (64 Monza Conv).

Frank DuVal



james rice wrote:

>All:  I do not remember valve seats being an issue 20 years ago, except
>maybe on race cars.    Given Warren's observation, is there a preventive
>solution?  Letting the engine cool down before shut off?  70 deg garages in
>the winter time to keep everything warm?
>
>I do not know what the current process and procedures are for valve seat
>replacement.
>
>If I remember correctly, Jim Schardt, before doing any of his head
>modifications, use to take the seats out, heated the heads and seriously
>cooled what I presume were oversize seats and press them in with 0.010"
>interference.
>
>Jon Brakke, who was the last person to SCCA race Stingers competitively,
>said he had his head re-heat treated before doing anything else.  I assume
>he took the seats out first.
>
>Are there any shops doing this to street heads today?  At what cost?  What
>heat treat specifications?
>
>Warren, Seth, Bob H and Bob C., got any info?
>
>
>  
>