BluePrint Engines GM LS Compatible Bare Block Deck Bore SIAM Steel Billet Main Caps

The BluePrint Engines GM LS compatible bare engine block gives LS-style performance builds a strong, precision-machined foundation. It is a SIAM (siamesed-bore) iron cylinder block with steel billet main bearing caps. It is designed for builders who want more displacement and durability than a stock LS block can offer in high-horsepower, high-rpm combinations.

Key Features:

• Steel billet main caps: machined from billet steel instead of cast or ductile iron. They keep the stock LS cross-bolted, deep-skirt design and add crankshaft support under heavy load.
• SIAM cylinder bores: siamesed bores support larger bore sizes and stroker combinations.
• Reinforced architecture: thick cylinder walls and a rigid structure for demanding builds.
• Precision machining: line-honed main bearing bores and machined surfaces for accurate assembly.
• Iron construction: cast iron block material with OEM-style provisions such as the starter location, timing cover and valley cover.
• LS compatibility: built around the GM LS architecture, so it works with common LS-pattern components.

This bare block is a good starting point for custom LS engine builds. Typical uses include street/strip, racing and high-output stroker projects. BluePrint Engines is a well-known maker of performance crate engines and engine blocks.