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Just bought stock 1973 Q code (351c4v) mustang convertible. I have read much about the 1970 closed chamber heads over the open chamber heads I presently have. Is there any advantage and can I swap heads to the cc without changing pistons? Assuming I can do it (I am not sure if the 1973 pistons are compatible (clearance wise) with the 1970 heads) is it worth the effort? What will I gain and what will I lose? Stock 351c 4 speed with 3.25 9" ls rear.

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1990 Ford Mustang LX 351M powered!! Project Cherry Bomb!!
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You'll gain compression using the closed chamber '70 heads for sure. Thing you have to remember is unless the '70 heads were rebuilt with hardened valve seats you'll need to run a lead substitute with them to keep from wearing them out sooner.
 
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