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Hollow Cylinder Head Dowel Pin for Honda GX390 & Big Block Clone Engines
188F-11009-A GX390/420 Clone M10x14 Side Cover Dowel
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Hollow Cylinder Head Dowel Pin for Honda GX390 & Big Block Clone Engines

Part Number: 34006-00007-00
Online Price: $1.50
Hollow Cylinder Head Dowel Pin for Honda GX390 & Clone Engines
Availability: In Stock.

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Description

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.

FAQ

Q1: What does this dowel pin do in a GX390 engine?
A: It aligns the cylinder head with the engine block (crankcase), ensuring proper seating of the head gasket and preventing movement during operation.


Q2: What engines is this dowel pin compatible with?
A: It fits Honda GX390 engines and most Big Block Clone engines modeled after the GX390. Always verify your dimensions before purchasing.


Q3: What are the dimensions of the dowel pin?
A:

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


Q4: Do I need to modify this dowel pin if I’ve decked the head or use a thinner gasket?
A: Yes. If your head has been decked or you're using a thinner head gasket, you may need to shorten the dowel pinslightly to allow the head to seat fully against the block. Otherwise, the head may not torque properly, leading to gasket failure.


Q5: Can I use this dowel pin on aftermarket heads?
A: Generally, yes—as long as the dimensions match and the head accepts a 12mm dowel pin. Always check for compatibility with your specific aftermarket components.


Q6: What happens if the dowel pin is too long?
A: If the dowel pin is too long, the head may bottom out on the pin, preventing proper clamping force when torqued. This can lead to blown head gaskets and loss of compression.

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