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Heads are mostly known by CC`s. Intake runner size is measured in CC`s, Exhaust runners, as well as combustion chambers. So a 68cc head would mean the combustion chambers are 68cc`s. The size of the chamber will have a effect on compression ratio. A smaller chamber has higher compression than will a larger chamber. Factory heads aren`t know to be real accurate on CC`s in size so many buy a CC kit to measure them.
 

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Are the heads you have 882`s? they are junk. What is your power goal? how much do you have to spend? Street or strip? Excessive milling heads causes misalignment problems and knocks off the valve train geometry.
From here on you should forward your questions to the Hotrodding Basics forum of this site.
 
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