Re: Proper gas for 374 engine

Posted by 55PackardGuy On 2011/3/3 22:22:06

AL,

This squares with articles that I have read, including some old, old comparisons of gasolines, that often disparaged brands that achieved their high octane ratings by adding lead. One, in fact, said that a certain brand (I believe it was AMOCO at the time) would be a great gasoline if they'd "get the lead out." (Circa late 1950's.)

It's true to this day. 100+ octane rated pump gas is available that does not contain lead... often called "clear gas." Once again, visit a local Mobil station. Look for the "racing gas" pump. It has a nozzle that will not fit an unleaded filler, but the fuel contains no lead.

Lead was a cheap short-cut to boost octane ratings. Probably necessary in the early days of the "Otto" engine development. It's is awful, and unnecessary, that so much land, especially in cities, is contaminated with high levels of lead due to this practice being implemented far longer than necessary.