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Here is the Scat/KB rotating assembly that Blueprint uses in their 383s. By selecting either dished or flat-top, a compression ratio between 9:1 and 10.25:1 can be had. Our engine used forged flat-tops for the higher 10.25 ratio. The bushed-pin Scat stroker rods feature 7/16-inch ARP bolts, and are good to 800 hp.