fuel

[slyfox]

I own a 76 Cordoba, I've installed a Edelbrock intake, and a Edelbrock 600 cfm carb, I know it's a low compression engine, it's a 400, with duel exhaust with Hemi mufflers on it, I'm running 87 Octane, I heard that low compression engines run ok on regular, will it make a big difference if I use 91 octane in performance, and is it true that 91 octane as no ethanol in it, I know that 87 does, Thanks.... Sly

[BSB67]

....will it make a big difference if I use 91 octane in performance....

No.  None