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I have a 2001 Yukon XL Denali with a 6.0L with a hole in the block. I bought it this way and I was planning on swapping in a 5.3L from a 2004 Tahoe. After looking at both of them, the 01 has an EGR valve and the 04 doesn't. The PCMs are different with the 01 being a P01 and the 04 being a...