H And H Builds A Flathead For A Knucklehead 59A Block
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6. The 24-stud blocks are commonly referred to as 59As—in reality, Ford changed block designations almost on a yearly basis. The 24-studs have round water passages on the center and bottom. An easy way to determine stud count: the 24s have two holes in the center and the 21-stud early blocks have three down the center. View Related Article
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