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88mm Stock Head Gasket for Honda GX390 & Big Block Clones
188F-11010-A GX390 Clone Cylinder Head Gasket
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88mm Stock Head Gasket for Honda GX390 & Big Block Clones

Part Number: 188F-11010-A
Online Price: $4.85
Stock Composite Head Gasket for Honda GX390 & Big Block Clones – 88mm Bore
Availability: In Stock.

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Description

Stock Composite Head Gasket for Honda GX390 & Big Block Clone Engines (88mm Bore)


Maintain a reliable seal between the cylinder head and block with this OEM-style composite head gasket, designed for Honda GX390 and most GX390-style Big Block Clone engines with an 88mm bore. This gasket features a steel fire ring for added durability and resistance to combustion pressure, making it ideal for both stock and mild performance builds.


This head gasket is engineered specifically for engines in the 390cc class (with 88mm bore). Engines with larger displacements, such as 420cc (90mm bore) or 440cc–460cc (92mm bore), require larger-bore head gaskets and are not compatible with this part.


Key Features

  • Designed for 88mm bore blocks (approx. 390cc engines)
  • Composite construction with integrated steel fire ring
  • Seals effectively under high pressure and temperature
  • Ideal for GX390 and most Big Block Clone engines
  • Not intended for 420cc or larger engines with bigger bore diameters


Specifications

  • Material: Composite with Steel Fire Ring
  • Thickness: ~0.061" (uncompressed)
  • Bore Diameter: ~89.9mm (~3.54") – accommodates up to +0.75mm overbore


Compatibility Note

  • Fits most Honda GX390 and Big Block Clone engines with an 88mm bore
  • Not recommended for:
    • 420cc engines (typically 90mm bore – use 91.6mm gasket)
    • 440cc/460cc engines (typically 92mm bore – requires larger gasket)
  • Using the incorrect gasket bore size can result in poor sealing or gasket failure

FAQ

Q1: What engines does this head gasket fit?
A: This head gasket fits Honda GX390 and most Big Block Clone engines with an 88mm bore, which are typically 390cc engines. It is not designed for 420cc or 440cc+ engines.


Q2: What is the bore size this gasket supports?
A: The gasket has a bore diameter of ~89.9mm (3.54”), making it suitable for stock 88mm bores and light overbores up to approximately +0.75mm.


Q3: Can I use this gasket on a 90mm or 92mm bore engine?
A: No. For 90mm bore engines (e.g., Predator 420), you should use a gasket with at least a 91.6mm bore diameter. For 92mm engines (440–460cc), you’ll need a gasket matched to that bore size. Using this 88mm gasket on larger bores may lead to sealing issues or gasket failure.


Q4: What is the gasket made of?
A: It is made of composite material with a steel fire ring, which helps improve durability and sealing around the combustion chamber.


Q5: What is the thickness of this head gasket?
A: The gasket is approximately 0.061" thick (uncompressed), providing a good balance between sealing and maintaining compression.


Q6: Is this gasket suitable for high-performance or modified engines?
A: It’s designed for stock or mild performance applications. For high-compression, high-RPM, or racing builds, you may want to consider copper or MLS (multi-layer steel) gaskets rated for higher performance.

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