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In the Performance Assembly Solutions work area, the stock engines were disassembled to their bare blocks. After cleaning and checking, they went to a clean room for reassembly. Standard-diameter, forged Mahle pistons, made to Roush specs with a 16cc dish for about 8.6:1 compression, replaced the factory 9.8:1 hypereutectic slugs. The steel H-beam connecting rods were basically clones of those used on the '03-'04 Terminator Cobra.