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While we’ve written quite a bit about Ford Racing Performance Parts’ Boss 351 engine block (M-6010-BOSS351BB; $2,132.99), this is only our second build effort with the 9.5-deck block. Like its 302 predecessor, the bigger Boss casting features nodular-iron, four-bolt main caps (with 2.75-inch main- bearing journal) and screw-in freeze plugs, and can be bored as big as 4.125 inches for large-displacement engines. A shout of props goes to Derek Raney and L&R Automotive (www.lnrengine.com) for their help with preparing the Boss 351 for this project. L&R opened the cylinders to 4.030 inches, squared the deck, and clearanced the block where necessary to accept the 4.000-inch-stroke crankshaft and 6.200-inch rods that comprise our 408.