I think the Northstar engines from 1999-2002 could run on 87 octane, but not sure about the newer ones. They include a knock sensor, you know, to send a signal to the pcm when the engine starts knocking, to retard the timing. The power is reduced and fuel mileage suffers too, so many people mix 91 and 87 octane in em. In order for the engine to get 320 hp, the higher octane is required. You'd think a 283 cubic inch engine could be run on low octane huh?
Don St.Clair
Culleoka Tn
Edited by: roundedline at: 6/19/06 2:29 pm
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