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I thought the 58cc was for the magnum head and the standard was 63?



They list them as 63 and 65, with the Victor at 58.

http://www.edelbrock.com/automotive/mc/cylinder-heads/chrysler/performer-rpm-sb.shtml

http://www.edelbrock.com/automotive/mc/cylinder-heads/chrysler/victor-sb.shtml



Has Edelbrock finaly found a deposit of unobtanium big enough to start casting those victor heads?