Racing gas, low compression, and ignition timing

[Mike Croley]

Originally Posted by VStock

I'll admit up front that I have no experience with today's racing gas. How does it compare to the old leaded gas? How does it do in a low compression engine, say 8.5-1? Can you run a lot of advance without knocking?

A low compression engine like the one you describe works just fine on pump gas as long as it's premium . Two things to keep in mind . First , stick with one brand from one trusted station . Shell or Chevron are the best choices .
Second , don't increase advance more than a couple of degrees at a time and rely on plug readings and timing slips to tell you when you hit it right .