RE: 346 and 452

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Sean, I believe that 1972 was the year that all cars had to be able to 
run on low lead gas so I think 72 heads should have the hardened seats.

Dan


Sean B wrote:
> 
> I see guys on eBay selling 346 heads as having factory hardened valve 
> seats for unleaded fuel, all the time.  I have a set of 346 heads from a 
> 
> '72 New Yorker.  These heads aren't for unleaded, are they?  I thought 
> only the 452 heads were hardened?
> 
> Sean


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