Not Ranked
You will never make maximum HP with a wide open afr of 12.5 Engine builders, and carb manufacturers like to err on the rich (safe) side. Street Engine builders will tell you one thing. If you want to see the winners circle, race engine builders will tell you to jet much leaner. Somewhere in the middle ground you will make much better HP than you can at 12.5 & still have reliability.
Z.
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'65 K code Mustang
'66 Galaxie 500
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