<VV> Valve Seats

[levair at aol.com]

Charlie Clark welded up all of the?? valve seat pockets and started over for his race car. . 

I have used his method with great success. The weld material is MUCH harder than the cast material and is akin to "local" heat treating. 

Warren


-----Original Message-----
From: Frank DuVal <corvairduval at cox.net>
To: james rice <ricebugg at mtco.com>
Cc: virtualvairs at corvair.org
Sent: Thu, 15 Nov 2007 12:13 am
Subject: Re: <VV> Valve Seats



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??
>?
>?
> >?
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