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Although there have long been rumors of a 289 High Performance block this has never been true. What makes a Hi-Po block a Hi-Po block are wider main bearing caps like we see on the Ford Mexico small-blocks. In fact, you can create a Hi-Po block with the wider Mexican main caps. Otherwise, block casting numbers remain the same. This particular block belongs to Scott McMullen with a C4OE-6015-F, which is a rare 1964½ 289 Hi-Po block. More common is the C5AE-6015-E block.