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Get a crack warranty (guaranteed rebuildable without welding) on the used head and all you'll be out is time and gas if it is bad.
Cant weld on a aluminum head anyway <img src="/forums/images/graemlins/shame.gif" alt="" />. You cant fix internal cracks on aluminum heads due to you cant magnaflex them. The normal cracks show up around the valve seats. If you get one from the junk yard, have it checked for crackes to. You have to remember theres a reason its in there.

Last edited by LandRaider; 03/27/08 07:21 PM.