Dowel Pin - Split Type GM LS Block to Cyl. Head

The Pioneer Dowel Pin – Split Type GM LS Block to Cylinder Head (MPN: PG-525-100) is a precision-engineered alignment component designed specifically for GM LS-series engine assembly. These split-type steel dowels serve a critical function in maintaining concentricity between the engine block and cylinder head, ensuring proper gasket sealing and preventing coolant and oil leakage at the critical interface where these two components meet.

Supplied as a set of 100 pieces in natural (uncoated) steel, these dowel pins feature a split design that allows for controlled compression during installation while maintaining a snug fit that resists vibration-induced loosening. The split configuration also accommodates minor dimensional variations in block and head bores, improving installation reliability across different casting runs and machining tolerances typical in production LS blocks. During engine rebuilds, having a full complement of fresh dowels eliminates the risk of reusing worn or damaged pins that could compromise head gasket integrity.

This set is essential for any serious LS engine build, whether you're performing a stock rebuild, upgrading to higher-displacement variants, or undertaking a performance modification. Engine builders and enthusiasts working on LS1, LS2, LS3, LS6, LS7, or LS9 applications rely on proper dowel alignment to ensure cylinder head bolt torque is distributed evenly and gasket clamping force remains consistent across all cylinders. Having factory-correct replacement dowels on hand prevents assembly delays and protects the significant investment made in machine work and component sourcing.

Pioneer is a recognized manufacturer of OEM and replacement engine gaskets and sealing components, and these dowels meet the specifications required for proper LS engine assembly. The 100-piece quantity ensures you have spares for future builds or repairs without needing to reorder.