O2 sensor

[xxalexx at ix.netcom.com]

I was looking at some GM truck parts microfish, most models
have leaded parts for military and export, did not see any racing #'s 
In these situations a little brain damage is ok.
alex
> Anyone know of 4-wire sensor that is preferred due to its resistance to lead
> poisoning?  Search of local parts store turned up several Bosch P/N's LSH
> 22, 25 and 64.  They all appear the same, except for lead length and
> termination style.  Are there any other differences?   I heard the NTK used
> for Fords is especially resistant.  Where can I get these?
>