Hollow Cylinder Head Dowel Pin for Honda GX390 & Big Block Clone Engines

Hollow Cylinder Head Dowel Pin for Honda GX390 & Big Block Clone Engines

Ensure precise cylinder head alignment and a secure head gasket seal with this Hollow Dowel Pin, designed for Honda GX390 and GX390-style Big Block Clone engines. This dowel pin is critical for maintaining proper alignment between the cylinder head and engine block (crankcase) during assembly.

By preventing lateral movement during engine operation, the dowel pin helps protect against head gasket failure, sealing issues, and cylinder head damage.

Key Features

• OEM-style fit for Honda GX390 and most Big Block Clone engines
• Prevents cylinder head movement that can lead to seal loss and gasket damage
• Essential for high-performance or rebuilt engines where alignment is critical
• Hollow design allows for reduced weight and optional guided insertion

Specifications

• Outer Diameter: ~11.95mm (12mm)
• Inner Diameter: ~10.4mm
• Overall Length: ~19mm

Fitment Note

If you're using a decked cylinder head or thinner aftermarket head gaskets, you may need to shorten these dowel pins slightly. This ensures the cylinder head can fully seat against the block without bottoming out on the pins. Failure to do so may prevent proper head torque and result in gasket blowout or sealing issues.

Fits most GX390-style clone engines – Always measure your setup before ordering