OK to use 87 octane if there is no ping?

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06-29-2013, 10:54 AM

Young1

CC Member

Join Date: Mar 2012

Location: Ocala, FL

Cobra Make, Engine: Unique 427 S/C, FE 440, top-loader, 3.31

Posts: 130

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OK to use 87 octane if there is no ping?

I am weaning my iron head 9.8 compression FE off 91 octane. Ran over a thousand miles with 89 and no ping. 38 degrees advance all in at 2800 rpm. Right now I am using a mix of 87 and 89 for 88. As long as it does not ping am I ok to burn 87? Any other side effects to watch for?

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