Pioneer 839004 Cylinder Head Alignment Dowel Pin Kit for Small Block Chevy & Pontiac

The Pioneer 839004 is a high-performance cylinder head-to-block alignment dowel pin kit designed for Small Block Chevrolet and Pontiac 350 engines. These precision-manufactured solid dowel pins ensure proper cylinder head alignment during engine assembly or reassembly, especially after block or head surfacing.

Key Features:

• Solid construction for precise, repeatable cylinder head alignment
• 5/8" O.D. with a 1/2" length for a secure, accurate fit
• Designed as a high-performance replacement for original OEM-style dowel pins
• Ideal for use after engine block or cylinder head resurfacing
• Interchange part numbers: Mr. Gasket 4375, Renegade 57921

These dowel pins are a critical engine rebuild component — after the block has been surfaced, replacing the original pins with Pioneer's precision-manufactured performance dowels helps maintain proper head-to-block alignment and ensures a consistent, reliable gasket seal.