<VV> Valve Seats

[Dave Ziegler]

I also had a replaced seat drop out on a 1969 95 hp engine in less than 
150 miles on the repaired head. The first one in over a thousand such 
repairs. I was promptly given a new head with a new valve job as a 
replacement.
Dave.. .
On Nov 15, 2007, at 12:13 AM, Frank DuVal wrote:

> 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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