Trojan Boat Forum

Just wondering if I should be adding a lead additive to my gas. I've got a 75 F25 with the 318.

What do some of you other guys do?

They said lead help valves , but you don't see valves burning like the use to . only thing to worry about is the ethanol in the fuel

Does anyone remember what year unleaded was introduced? Engines manufactured just before and since, and rebuilds would have incorporated hardened seats, no?

75/76 is when it changed over I believe .. and once you get the fuel system set and engines timed for corn gas your boat run normal again and dependable. It's just one big pain in the a@$ gettin' it done.

Big D wrote:Does anyone remember what year unleaded was introduced? Engines manufactured just before and since, and rebuilds would have incorporated hardened seats, no?

At first all gas was unleaded. In the 1920s lead was added to gas and all gas had lead with the exception of standard oil ( Amoco) they never put lead in their Hi Test ( known as white gas for years ) With the start of Cat converters (1975) unleaded was a must so in the mid 70s every one had a unleaded ,but most still sold lead too. over time leaded was fazed out .

Early 70s just before Cat. converters the were selling low lead then the no lead in 75 with the intro of cats.