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Tillotson .500 Body Channel Welch Plug
179-63 Tillotson .500” Body Channel Welch Plug
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Tillotson .500 Body Channel Welch Plug

Part Number: 179-63
Online Price: $0.79
179-63 Tillotson .500" Body Channel Welch Plug
Availability: In Stock.

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Description

179-63 Tillotson .500" Body Channel Welch Plug – OE Soft Plug for HL Carburetors


The 179-63 Tillotson Body Channel Welch Plug (also called a soft plug) is an essential sealing component for covering fuel circuit passages within Tillotson carburetors. Most commonly, this plug seals the low-side fuel well, though it may also be used to cover high-speed circuits or, in rare cases, the main nozzle channel—depending on the carburetor model and configuration.


The factory-installed welch plug is often coated with epoxy resin. However, during rebuilds or blueprinting, applying epoxy is typically unnecessary if the plug is correctly installed and seated.


To install this plug securely, use the Tillotson 753 Welch Plug Installation Punch, which is designed to properly expand the soft aluminum plug into the carburetor body. This ensures a tight seal that won’t leak under pressure or vibration.


Key Features:

  • OE replacement Tillotson .500" welch plug
  • Seals internal fuel circuit wells (low, high, or nozzle passages)
  • Ideal for carburetor rebuilds, tuning, and performance blueprinting
  • Designed for use with Tillotson 753 welch plug punch
  • No epoxy required for rebuilds (optional for extra sealing)
  • Made from soft aluminum for easy expansion and tight seal


Installation Note:

Always use the correct size punch to avoid damaging the carburetor casting. Improper installation can cause leaks or disrupt fuel delivery.


Compatible With Tillotson HL-Series Carburetors:

  • HL-348E
  • HL-355A, B, C, D, E
  • HL-360A, B, C
  • HL-375A
  • HL-380A, HL-380B
  • HL-1A
  • ...and other Tillotson HL carburetors requiring a .500" soft plug


Specifications:

  • Diameter: .500”
  • Material: Soft aluminum
  • Type: Body channel welch plug (press-fit)

FAQ

Q1: What is the function of the 179-63 Welch Plug?

A: The 179-63 Welch Plug seals internal fuel passages in Tillotson HL carburetors—most commonly the low-speed circuit, but it may also cover high-speed or nozzle circuits depending on the carb model.


Q2: Do I need to use epoxy when installing this plug?

A: While the factory plug is epoxied, it's not required during rebuilds if the plug is correctly installed using a Welch plug punch like the Tillotson 753 tool.


Q3: What tool is recommended for installing this plug?

A: Use the Tillotson 753 Welch Plug Installation Punch. It is specifically designed to expand the plug securely into the carburetor body without damage.


Q4: Which carburetors is the 179-63 plug compatible with?

A: It fits many HL-series carburetors, including:

  • HL-348E
  • HL-355A through HL-355E
  • HL-360A, B, C
  • HL-375A
  • HL-380A, B
  • HL-1A
    ...and others that require a .500" soft plug.


Q5: What material is the plug made of?

A: The 179-63 is made from soft aluminum, allowing it to expand and form a leak-proof seal when properly installed.

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