RE: 346 and 452

[ntolerance <ntolerance@xxxxxxxxxxx>]

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ITs really hard to see on a used set of heads. On the NOS heads I have 
seen , you can see a discoloration around the valve seat. ITs not a 
clear cut circle, its sort of a fuzzy ring. If you shot blast the heads, 
you probably wont be able to see it ever again. If they are hot tanked, 
you might have a shot at it. As I recall the ring is a bit darker than 
the rest of the metal. Check the casting date, if they are 72 or later 
heads they are probably hardened.

Doc.


Sean B wrote:
> 
> What type of ring should I look for?  I've got a 1972 440 that I need to 
> 
> tear down, and it has the 346 heads.  I was all set to hunt down a set 
> of 452 heads for their unleaded ability, and I'll be overjoyed if I 
> don't have to!
> 
> Thanks,
> 
> Sean
> 
> ntolerance wrote:
> > 
> 
> > If you were to look at a NOS set of heads, its prety clear which ones 
> > are induction hardened and which one arent. You can see the ring around 
> > the seat where the induction took place.


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