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Clone 390-420-460 Head Bolt
Clone 390-420-460 Head Bolt
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Clone 390-420-460 Head Bolt

Part Number: 188F-11008-A
Online Price: $2.49
Stock Head Bolt for Honda GX390 & Big Block Clone Engines (M10-1.25 x 80)
Availability: In Stock.

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Description

Stock Cylinder Head Bolt for Honda GX390 & Big Block Clone Engines


Secure your cylinder head with confidence using this OEM-style stock head bolt, designed to fit most Honda GX390, Predator 420, and other GX390-style Big Block Clone engines. These bolts are essential for clamping the cylinder head tightly to the engine block, maintaining combustion pressure and sealing integrity under load.


Built to Metric 8.8 grade (SAE Grade 5 equivalent) standards, this head bolt offers strong, reliable performance for stock and mildly modified small engine builds.


Key Features

  • Fits Honda GX390, Predator 420, and most Big Block Clone engines
  • Metric 8.8 Grade (SAE Grade 5 equivalent) for strength and reliability
  • Ideal for stock rebuilds and general maintenance
  • Used to secure the cylinder head to the engine block


Specifications

  • Thread Size: M10 x 1.25
  • Length: 80mm
  • Material Grade: Metric 8.8 (SAE Grade 5 equivalent)
  • Recommended Torque: 26 ft-lbs with 14mm socket


Applications

  • Honda GX390
  • Predator 420 (Non-Hemi and Wedge-style heads)
  • Other GX390-based Big Block Clones

FAQ

Q1: What engines does this head bolt fit?
A: It fits Honda GX390, Predator 420, and most Big Block Clone engines that use M10-1.25 x 80mm head bolts to secure the cylinder head to the block.


Q2: What are the specifications of this bolt?
A:

  • Thread Size: M10 x 1.25
  • Length: 80mm
  • Grade: Metric 8.8 (SAE Grade 5 equivalent)
  • Torque Spec: 26 ft-lbs


Q3: Can I use this bolt on modified or aftermarket heads?
A: Yes, as long as the head and block are designed to accept M10 x 1.25 x 80mm bolts, and the required torque spec matches. For high-performance builds, you may want to upgrade to a higher-strength fastener like Grade 10.9 or ARP bolts or studs.


Q4: What torque should I use when installing this bolt?
A: Torque to 26 ft-lbs unless otherwise specified by your engine or gasket manufacturer.


Q5: Is this bolt reusable?
A: For stock applications, head bolts like this can usually be reused if they are not stretched, stripped, or corroded. Always inspect used bolts carefully or replace them during rebuilds for best results.


Q6: What material is this bolt made from?
A: This is a Metric 8.8-grade steel bolt, equivalent to SAE Grade 5, suitable for standard head clamping forces in small engines like the GX390.

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