Can anyone tell me whether the 3998993 heads with a C 73 casting date had hardened valve seats? I'd like to know whether I can run them on unleaded fuel without adding an additive or damaging the seats. Thanks!
3998993 head question
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Re: 3998993 head question
I wouldn't worry about it - valve seat recession with unleaded fuel is pretty much a myth, unless you're towing a trailer at 100mph all day long. The additives don't do anything except eat the plating off the inside of your float bowls and lighten your wallet.- Top
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