how much hp does a 1966 v6 mustang have stock?

 

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No such thing as a 66 V6



the 66 I6 would put about 90-100 to the back tires IIRC

 

You probably mean the 289 V8. That would depend on whether you are talking about a C, A or K code engine. That would be anywere between 200 and 271 HP to the flywheel. Netting you anwhere from 130-200 HP to the rear tires.