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Clone 390-420-460 Valve Lifter Tappet
188F-13009-A GX390/420 Clone Valve Lifter Tappet
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Clone 390-420-460 Valve Lifter Tappet

Part Number: 188F-13009-A
Online Price: $4.99
Stock Flat Tappet (Lifter) for Honda GX390 & Big Block Clone Engines – 25.95mm Head
Availability: In Stock.

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Description

Stock Flat Tappet (Lifter) for Honda GX390 & Big Block Clone Engines


These OEM-style flat tappets (lifters) are designed to fit most Honda GX390 and GX390-style Big Block Clone engines, providing smooth valve operation and consistent performance. Machined from durable steel, these lifters are ideal for stock and mild performance applications that utilize a flat-tappet camshaft.


To ensure longevity and proper break-in, we strongly recommend using a high-quality assembly lube such as Maxima Racing Oil’s Assembly Lube during installation. This helps prevent premature wear in the tappet bores and on camshaft lobes during initial startup.


Key Features

  • Fits most GX390, Predator 420, and other Big Block Clone engines
  • OEM-style flat tappet design for standard camshaft profiles
  • Precision-machined steel for durability and consistent performance
  • Ideal for stock rebuilds and replacement use
  • Compatible with 6mm ball-end push rods


Flat Tappet Specifications

  • Head Diameter: 25.95mm (1.021")
  • Stem Diameter: 8.92mm (0.351")
  • Push Rod Pocket Diameter: 6mm (0.242")
  • Overall Length: 46mm (1.814")
  • Weight: ~30.3g


Fitment Notes

  • Compatible with flat tappet camshafts only
  • Not for use with roller camshafts 
  • Always measure your existing tappets and cam specs to confirm fit


Recommended Install Tip

Use Maxima Racing Oil Assembly Lube or a similar break-in lubricant on tappet bodies and cam lobes during installation to protect against premature wear and scuffing.

FAQ

Q1: What engines are these tappets compatible with?
A: These flat tappets are compatible with Honda GX390, Predator 420, and most Big Block Clone engines using a flat tappet camshaft design. Always verify dimensions to ensure proper fit.


Q2: What are the tappet/lifter specs?
A:

  • Head Diameter: 25.95mm (1.021")
  • Stem Diameter: 8.92mm (0.351")
  • Push Rod Pocket: 6mm (0.242")
  • Overall Length: 46mm (1.814")
  • Weight: ~30.3g


Q3: Can I use these tappets with aftermarket or high-performance camshafts?
A: Yes, if the camshaft is a flat tappet style and push rod geometry is unchanged. For high-lift or aggressive camshafts, upgraded lifters may be recommended depending on spring pressure and RPM range.


Q4: Do these work with roller camshafts?
A: No. These are designed for flat tappet camshafts only. Do not use with roller cams or lifter bores designed for roller lifters.


Q5: Should I use assembly lube during installation?
A: Absolutely. We recommend using Maxima Racing Oil Assembly Lube or equivalent on the lifters and cam lobes during installation to reduce wear during initial startup.


Q6: Are these lifters reusable?
A: In general, new tappets are recommended when replacing camshafts or during engine rebuilds. Used tappets may have wear patterns that don’t match new cam profiles and can cause damage if reused.

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