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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jul 2007 Posts: 31 Junior Member | | Junior Member Joined: Jul 2007 Posts: 31 | My 66 began to run quite rough all of a sudden. I had just put in 10 gallons on high "super unleaded" fuel. Is this not a recomended fuel for older trucks? | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | You don't need to run anything but cheap regular unleaded in a '66, but super shouldn't have made it run rough either, unless the fuel filter plugged up somehow.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | | | | Joined: Jul 2005 Posts: 640 Shop Shark | | Shop Shark Joined: Jul 2005 Posts: 640 | Like 4onthefloor says, you're just wasting your hard earned money by putting anything but 87 octane in your tank. All the higher octane fuel does is resist detonation for awhile, so it MAY be affecting your timing a small amount. | | |
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