You have analyzed the product you purchased and I won't argue with that. The research chemist I consulted told me flatly tetraethyl lead was so toxic, it should never be handled by untrained personnel or without laboratory gloves and a respirator. He says even minute amounts are toxic. Read this for a real eye-opener
TEL Toxcity As to hardened seats requiring stainless valves, no more miles than our Packard V8s see, most anything will work. Exhaust valve recession is caused by long, high speed hard pulls where the heat build to extremely high levels. Ask yourself how often your Packard V8 pulls a trailer across the Grapevine.
As for me, I install hardened exhaust seats in everything I build, with or without stainless exhaust valves.
Jack Vines
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