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Message: <blockquote data-quote="Jakespeeds" data-source="post: 1474743" data-attributes="member: 21192">Daryl,  I did not mean to say the stock 5.0 heads were aluminum.  Meant to say that Mustangs come factory with aluminum heads.  I doubt that is going to raise an eyebrow.  I think on your era they were only cast iron.  Someone else on here will have a better answer.  I do not know much about those engines.  Short answer is you can do just about anything you want to the bottom end.  But that factory ignition will only be able to deal with so much.  You do not have a very advanced detonation ignition retard on that car.  So depending on the chamber size of the head you will probably want to be no higher in compression that 10.5:1.  You can even run a cast piston if you like.  But a good upgrade would be forged.  After that you just use good quality components in the bottom end.  Ford built those engines to take a lot of abuse.  Factory clearances and products would serve you just fine.    Concentrate on getting the coolest and highest volume of air in.  And making it as easy as possible to get the air out.Jake</blockquote>