1/2in Dual Dowel Assem Spacer

The 1/2in Dual Dowel Assembly Spacer from Jones Racing Products is engineered for marine engine builders and high-performance boaters who demand precision alignment and structural integrity in their powerplant installations. This spacer serves as a critical intermediary component in dual-dowel engine assembly configurations, maintaining exact bore concentricity and preventing lateral movement that could compromise gasket sealing or bearing alignment. Whether you're rebuilding an inboard racing engine or servicing a tournament fishing boat's power plant, this precision spacer eliminates guesswork and ensures your dowel-pin assembly remains rock-solid under sustained high RPM operation.

Manufactured to exacting tolerances, the 1/2in dual dowel assembly spacer utilizes a precisely machined design that controls spacing between crankcase and cylinder head interfaces where dual-dowel locating pins establish load paths. The 1/2-inch bore diameter accepts standard dowel pins while the spacer's calculated thickness maintains the exact vertical separation required for proper deck height and combustion chamber alignment. At just 0.15 lbs with compact dimensions of 2.7 x 1.45 x 4.1 inches, this component adds negligible weight while delivering the repeatability that separates production-line consistency from field improvisation—critical when you're running peak boost or high compression ratios where thousandths-of-an-inch matter.

Marine engine builders, performance shops, and serious boaters restoring or modifying inboard powerplants will recognize the value in Jones Racing Products' engineering heritage. This spacer integrates seamlessly into dual-dowel assembly sequences, functioning as a wear-resistant locating interface that maintains runout specifications across multiple reassemblies—essential if you're rotating engines seasonally or troubleshooting alignment issues. Installation requires no special tools; simply position the spacer over your dual dowel pins during block-to-head marriage, ensuring all fasteners seat uniformly and your cylinder head gasket receives consistent clamp load across the entire surface. For boaters who understand that engine reliability begins with precision assembly, this component is non-negotiable insurance.