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Plastic Insulator for Honda GX390 & Big Block Clone Carburetors
188F-14004-A GX390/420 Clone Carburetor Plastic Connecting Block/Manifold
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Plastic Insulator for Honda GX390 & Big Block Clone Carburetors

Part Number: 188F-14004-A
Online Price: $4.99
Plastic Carburetor Insulator for Honda GX390 & Big Block Clone Engines
Availability: In Stock.

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Description

Plastic Carburetor Insulator for Honda GX390 & Big Block Clone Engines


This plastic carburetor insulator is a critical component that mounts between the carburetor and the cylinder head on most Honda GX390-style and big block clone engines, including Predator 420 and Wildcat 460.


Functioning as a thermal barrier, the insulator spaces the carburetor away from the hot engine head, helping to prevent heat soak and fuel vaporization caused by high cylinder temperatures. This promotes cooler, denser fuel-air intake, improving engine reliability, performance, and starting consistency—especially under heavy load or high ambient heat.


Ideal for stock rebuilds or high-performance builds using aftermarket velocity stacks or filter adapters.


Key Features:

  • Fits Honda GX390, Predator 420, Wildcat 460, and other big block clones
  • Serves as a thermal spacer between the cylinder head and carburetor
  • Helps prevent heat soak and vapor lock in high-temperature environments
  • Made from durable, heat-resistant plastic
  • Compatible with OEM and aftermarket carburetor setups
  • Essential for maintaining stable fuel delivery and cold starting


A small but essential upgrade for protecting fuel integrity and ensuring optimal engine performance.

FAQ

Q1: What is the function of the carburetor insulator?

A: The insulator separates the carburetor from the cylinder head, reducing heat transfer to prevent vapor lock and improve fuel-air intake stability.


Q2: Will this insulator fit Predator 420 or Wildcat 460 engines?

A: Yes, it’s designed to fit GX390-style carburetors and heads, including common big block clones like the Predator 420 and Wildcat 460.


Q3: Why is a thermal spacer important?

A: Without it, heat from the engine head can cause the carburetor to overheat, leading to hard starting, fuel boiling, and power loss under high load or hot weather.


Q4: Is this compatible with aftermarket velocity stacks or filter adapters?

A: Yes, this insulator works with both OEM air boxes and aftermarket setups using velocity stacks or filter adapters.


Q5: What material is this insulator made of?

A: It’s made of durable, heat-resistant plastic engineered to withstand engine temperatures and prevent fuel system heat soak.

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