Aeroflow Performance engine blocks are the ideal starting point for any street performance build that demands quality and precision at a reasonable price. Start with a new heavy-duty cast iron engine block that is a semi-finished bare engine block that requires very little machining to match your internal components. These brand-new aftermarket GM LSX engine blocks have priority main oiling systems with two lifter crossover channels for extra oiling. An extra thick deck height, thick Siamese cylinder bores and enlarged water jackets ensures a reliable block. Featuring conventional 4 bolt steel main caps with splayed outer bolts, extended cylinder barrels at the bottom with enough stroker clearance for up to 4.100” stroke. The use of off the shelf standard components such as camshaft, timing chain and oil pump/pan etc. means a variety of aftermarket and factory components can be used. You can rest assured that these Aeroflow engine blocks have a great foundation for your next engine build.