Found out my 84 Mustang has a 91 Non H.O Crown Victoria engine in it. My plan was going to upgrade the Heads/Cam thinking i had a legit 91 H.O engine. Question is can i just swap out the piston/rod assembly from a 87 and up H.O engine and not touch the crank or will I need to balance the assembly. I'm Thinking since the Crank is the same from a H.O and non H.O just to leave it alone and being these engine are externally balanced, does this sound right?
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