GM Performance LSX Cast Iron Engine Block

The GM Performance LSX cast iron engine block (also called the LSX Bowtie block or LSX cylinder block) is a high-strength foundation for serious LS-based performance builds. It is based on GM's production LS7 block. GM cast it with extra material in key areas, including thicker decks and cylinder bores. That gives it the strength for big-displacement, forced-induction and nitrous engines.

Key Features:

• Durable cast iron construction for race-level strength at a reasonable cost
• Six-bolts-per-cylinder head clamping for forced-induction and nitrous combinations
• Supports large displacements, with extra-thick cylinder walls for stroker and big-bore builds
• Billet-style, 6-bolt main bearing caps for a rigid bottom end
• Production-based design that accepts LS-series Gen IV cylinder heads, cranks, camshafts, oil pans and accessories
• Main web bay-to-bay breathing holes to support higher horsepower
• Cam-in-block, deep-skirt design that delivers LS-series torque and rigidity

Backed by GM engineering, the LSX block suits professional engine builders and serious enthusiasts. It is a good choice for street, drag and competition engines that need a durable, proven base.