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The ethanol blend in street high octane fuel is what is causing so many issues with muscle cars, it changes the RVP which leads to boiling fuel in the fuel bowls and ethanol also leans the airfuel mixture as ethanol has 1/3 fewer BTU's as the same volume of gasoline, computer controlled engine can increase the fuel whereas a carb has the jets it has... For example from 71 -72 the LT1 carb jetting leaned from 70-71 with a 72 primary to 1972 with a 68 primary. If you are already leaner due to emissions in your carb then running a "lean" fuel the carb will be even leaner and your engine will probably run a little hotter. |
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