Re: Flame Hardened Seats?

[Tom Watters <tomwatters@xxxxxxxxxxx>]

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On Wed, 14 Apr 2004 08:12:48 -0500, "Thomas R Hansen" <trandco1@xxxxxxxx>
said:
> > 
> >  Hardness can be added to the metal by applying a
> > direct flame to the metal (flame hardened) or it can
> > applied through an oven process. You can add the
> > hardened seats to the early heads.
> > 
> >   Gary
> > 
> Just to expand on this, "flame hardened" or the use of an "induction"
> heater on a localized area, will change the hardness of cast iron.  Many
> times, two light valve re grinds, or one heavy one, are all it takes to
> completely remove the hardened area. So the depth of hardness is quite
> thin. With hardened seats installed, a steel seat is then in place. Steel
> has different properties than cast iron, so the likelihood of cracks or
> wear is greatly reduced. FWIW   Tom
> 

Would flame hardened seats not last as long or as well as steel seats?  
Tom
65 Dart GT 'vert
68 Plymouth 'vert
Longmont, CO

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