Gasoline

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08-03-2006, 02:44 AM

289FB

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Gasoline

What is the best octane for a 66 289?

08-03-2006, 12:08 PM

JD1969

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Join Date: May 2004

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Posts: 9,644

RE: Gasoline

Is it a stock engine? If so 87 is probaly fine, if the compression has been rasied then run 89 or 93.

08-03-2006, 01:30 PM

laserred02

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Join Date: Jul 2006

Location: IL

Posts: 1,070

RE: Gasoline

there was a hi-po 289 that had a higher compression which you may want to try a higher octane with, however if it is the base 289...as most were then 87 should be fine.

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