LS Aluminum Block - 4.120 Bore 9.240 D/H

The LS Aluminum Block - 4.120 Bore 9.240 D/H from Racing Head Service is designed for serious engine builders and performance shops focused on high-displacement LS platform builds. This precision-cast aluminum block is ideal for stroker engines, big-bore applications, and custom LS swaps that require exceeding stock displacement limits to achieve higher horsepower.

Constructed from durable aluminum alloy, the LS Aluminum Block features a 4.120-inch bore and a 9.240-inch deck height, allowing compatibility with larger displacement rotating assemblies and high-compression forging combinations. The aluminum design reduces overall engine weight compared to traditional iron blocks, enhancing the power-to-weight ratio and minimizing parasitic losses in both naturally aspirated and forced-induction setups.

Engine builders will find this block particularly beneficial for constructing competition engines or designing custom powertrains for late-model platform swaps. With tight manufacturing tolerances and superior metallurgy, this block ensures concentricity and bore finish that supports precision piston fitment and honing without compromise.