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The basis for the build is this Carroll Shelby aluminum 427 FE cylinder block. Made of A356 T-6 aluminum, it is 45 percent lighter than a factory iron casting and yet is also far stronger. It has substantial lifter valley reinforcement webs as well as thickened oil pan rails for extra reinforcement. The bore size is 4.25 inches standard with a 4.40-inch size also available. With a 10.15-inch deck height, a 4.500-inch stroke crankshaft can be accommodated, making a 525ci displacement achievable. For enhanced crankshaft longevity, the redesigned oiling system feeds the main bearings first, and the oiling system can be either wet or dry sump. The billet steel main caps are positively located using dowel pins and actually have four cross-bolted attachment points on journals two, three, and four, making them technically six-bolt mains. Ductile iron cylinder sleeves are installed with an interference step fit for a precise and solid fit. The block has redesigned cooling passages to aid cooling at high rpm. With a 0.750-inch deck thickness, the casting is able to support 1,500 hp. The Shelby block retains the original locations for mounting bosses and bellhousing bolt pattern, so it is a bolt-in replacement for all cast-iron 390/427/428 blocks. This block was listed on the invoice for $5,622. View Related Article
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