A "no lead head" consists of replacing the valve seats with harden seat inserts. Valves, guides, springs etal are the same. The head has the original valve seats milled out and the new harden seats pressed in. Choice is yours foor the cost of having the head converted you could do 2 normal valve jobs over many years. It's a pay me now or pay me later decision. If you don't plan on racking up 10,000 or more miles a year, year after year, run the standard set up.