well at least all of the factory 4 core tanks ive ever seen or had have been way thicker than any 3 core ones. have to trim the metal of the retainers usually, although the 4 core on the 72 blazer fit in the retainers, but it was damned tight, it just depends on what vehicle..
good luck
[This message has been edited by Fast68Chevy (edited March 25, 2002).]
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