Flex-fuel & non flex-fuel differences | Ford Explorer Forums

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Flex-fuel & non flex-fuel differences

ncranchero

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Elite Explorer
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City, State
Denver,NC
Year, Model & Trim Level
1997 F150 XLT 4x4
What is the difference in a flex and non-flex fuel motor? Is it all external or is there a difference in the long block?

Sorry if this has been covered, just looking for a quick internal/external answer.
 






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