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Chevrolet Performance LSX Bowtie engine blocks have been designed for the advanced competition engine builder. They feature Siamese cylinder bores and a semi-finished deck height. The Chevrolet Performance LSX Bowtie engine blocks can accept a maximum stroke of 4.250 in., a maximum bore of 4.250 in., and they can support displacements of 454 cu. in. or more. The blocks feature cast iron construction with a powdercoated orange finish. They accept all Gen III and IV LS-style cylinder heads, crankshafts, camshafts, and other components. Additional features of the Chevrolet Performance Parts LSX Bowtie engine blocks include: • Front oil feed lines that can be plugged or restricted for mechanical flat tappet or mechanical lifter applications • Can be safely machined to 9.200 in. deck height • 1054 Billet Steel 6-bolt main bearing caps • 6-bolt cylinder head bolt pattern • Cam bores that can be machined to accept 60mm roller bearings • Can be machined for larger diameter lifters • External oil pump feed at the rear • Added 7th transmission bolt hole to work with early-style GM transmissions • Can accept a front motor plate for racing use • Threaded freeze plugs that can be used for external heaters or coolers