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Well, to me, the difference in performance between the two heads is negligable. I would just go with the one that has less mileage on it. Same goes for the blocks actually. Granted, I dont know everything about the heads and blocks but thats just my input.
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ZC stuff
http://dh-racing.com
http://www.thezcr.com/html/zcbook.php
http://dmoore.com/crx/zc.htm
http://www.jgenginedynamics.com/HOME%20PAGE
http://www.theoldone.com/
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