[DeTomaso] Valve job

[Charles Engles]

Dear Bill,


             I am an engine rookie, but if understand correctly, you had 
cylinder head work done.   It required the installation of new valve seats. 
When the job was finished, you found that the new valve seats sit about 
1/16" high into the combustion chamber??    The new valve seats do not sit 
flush as did the originals??

             Either I have the wrong mental image of this or I think that 
there is something fundamentally wrong with the machine shop work.   That 
raised 1/16"  doesn't sound like it is proper or correct.   I have  heard 
that installing new hardened valve seats is a major PITA.    Perhaps, it was 
a bigger job and harder than the machinist anticipated.....

             Hopefully, more experienced and qualified gearheads will 
comment.


                            Warmest regards,  Chuck Engles

----- Original Message ----- 
From: <BillsStore at aol.com>
To: <detomaso at realbig.com>
Sent: Saturday, January 26, 2008 10:33 AM
Subject: [DeTomaso] Valve job


> Had a valve job done in which new oversized seats and valves were 
> required.
> When the new seats were set, they set back outside the head  throat hole
> leaving about a 1/16" machined lip from  the throat with a sharp edge. 
> This does
> not seem to be a problem  with the intake as the cool air is going from 
> small
> to big opening although the  edge might cause some small disturbance in 
> the
> short distance before it  goes around the valve. The exhaust concerns me 
> in that
> the hot air is  hitting this machined sharp edge.  It would seem that this
> would cause a  hot spot conducive to burning.    I thought this sharp lip 
> should
> be smoothed somewhat.  Any thoughts?
>
> Bill Vasser
> 74 Pantera
>
>
>
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