I've been using 91 octane and my 496" BBC seems to get along pretty well with it. I'll get an occasional run-on, but not always, and not bad. What I do get is crud in the carb. I have to remove it about once a year and clean it out. There was a thread addressing this here awhile back. Part of the problem is my street rod doesn't get driven enough, so the "modern, remove all the crud from your gas tank and fuel system and deposit it in the carburetor, gasoline" just sits in the fuel system and creates...crud.
My question is: Would I be better off using the lower octane regular unleaded and just add octane booster? Would there be any less crud using regular unleaded? It's a bit of a PIA to have to jerk the carb every year and do a cleaning. Thanks for your comments.


Tom