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EC Pinnacle 4.410
EC Pinnacle 4.410 Connecting Rod for Big Block Clones & Wildcat 460
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EC Pinnacle 4.410" Billet Rod – Predator 420, GX390 & Wildcat 460

Part Number: 8273
Online Price: $149.99
4.410" Billet Connecting Rod for Honda GX390, Predator 420 & Wildcat 460
Availability: In Stock.

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Description

8372 – EC Pinnacle 4.410" Billet Connecting Rod for Honda GX390, Predator 420 & Wildcat 460


The 8372 EC Pinnacle 4.410" Billet Connecting Rod is a high-strength performance connecting rod designed for Honda GX390, Predator 420, Wildcat 460, and other Honda GX390-style big-block clone engines.


At 4.410" center-to-center, this rod matches the stock rod length used in many Honda GX390/Predator 420-style engines while providing the strength and durability needed for modified, high-performance, and racing applications.


The EC Pinnacle is also an excellent choice for stroker engine combinations. When paired with a 72mm stroke crankshaft and the stock Wildcat 460 92mm flat-top piston, this rod combination can increase the Wildcat 460 engine to approximately 478.63cc.


EC Pinnacle Billet Construction

The EC Pinnacle connecting rod is manufactured from billet aluminum and designed to provide the strength and dimensional stability required for high-performance big-block clone engines.


A properly matched connecting rod is critical when increasing engine displacement or RPM. Rod length, crankshaft stroke, crankpin diameter, piston compression height, and block deck height all work together to determine the final rotating-assembly geometry.

The 4.410" EC Pinnacle provides a strong foundation for both stock-stroke and stroker big-block engine combinations.


Key Features

  • 4.410" Center-to-Center Length – Stock-length specification for many Honda GX390 and Predator 420 applications.
  • Billet Construction – Designed for increased strength and durability compared with stock cast-style rods.
  • High-Performance Ready – Suitable for modified engines, racing applications, and stroker combinations.
  • 1.421" Big-End Journal – Designed for compatible big-block crankshaft applications.
  • 0.789" Wrist-Pin Bore – Compatible with the specified piston and wrist-pin combination.
  • Bearing Included – Includes the appropriate rod bearing.
  • Rod Bolts Included – Supplied with connecting-rod bolts for assembly.
  • Stroker Compatible – Excellent choice for 72mm stroke Wildcat 460 combinations.


Technical Specifications

Specification

Details

Part Number

8372

Rod Length

4.410" Center-to-Center

Big-End Journal Diameter

1.421"

Small-End / Wrist-Pin Diameter

0.789"

Rod Weight

257g

Bearing

6391

Construction

Billet

Bearing

Included

Rod Bolts

Included

Wildcat 460 72mm Stroker Application

One of the key applications for the EC Pinnacle 4.410" connecting rod is the Wildcat 460.

When combined with a 72mm stroke crankshaft and the stock Wildcat 460 92mm flat-top piston, this rotating assembly produces approximately:

478.63cc


This makes the 4.410" EC Pinnacle an excellent option for builders looking to increase the displacement of a Wildcat 460 while maintaining a stock-style piston.

The actual piston-to-deck height and piston position must be verified during assembly because final dimensions can vary depending on the crankshaft, piston, block, gasket thickness, and machining tolerances.


Compatible Engines

The EC Pinnacle 4.410" connecting rod is designed for use with compatible:

  • Wildcat 460
  • Predator 420
  • Honda GX390
  • Honda GX390 clone engines
  • 420cc clone engines
  • 460cc big-block clone engines
  • Modified Honda GX390-style big-block engines
  • Custom stroker engine combinations


Recommended for

  • High-performance Honda GX390 engines
  • Predator 420 performance builds
  • Wildcat 460 racing engines
  • 72mm stroker crankshaft combinations
  • Big-block clone racing engines
  • Go-karts
  • Mini bikes
  • Drag racing
  • Modified utility engines
  • Custom high-displacement builds


Important Fitment & Assembly Information

This connecting rod is not a universal replacement for every 420cc or 460cc engine. Before assembly, verify the complete rotating assembly.

Always check:

  • Crankshaft crankpin diameter
  • Rod big-end journal dimensions
  • Wrist-pin diameter
  • Piston compression height
  • Connecting-rod length
  • Block deck height
  • Piston-to-deck clearance
  • Piston-to-head clearance
  • Piston-to-valve clearance
  • Counterweight and rod clearance
  • Bearing fitment
  • Rod bolt clearance


When using a 72mm or longer-stroke crankshaft, additional block, rod, piston, or camshaft clearance may be required depending on the combination.

Professional engine-building and precision measurement are recommended. Do not assume a combination will have the correct deck height or clearance based solely on nominal component dimensions.


Built for Big-Block Performance

Whether you're building a Predator 420, Honda GX390, or Wildcat 460, the EC Pinnacle 4.410" billet connecting rod provides a strong and versatile foundation for performance and stroker combinations.


For builders looking to turn the Wildcat 460 into a 478cc-class big-block using a 72mm stroke and stock 92mm flat-top piston, the 4.410" EC Pinnacle is an excellent connecting-rod choice.

FAQ

What engines does the EC Pinnacle 4.410" connecting rod fit?

The 4.410" EC Pinnacle is designed for compatible Honda GX390, Predator 420, Wildcat 460, and other 420cc–460cc Honda-style big-block clone engines.


What is the length of this connecting rod?

The rod measures 4.410" center-to-center, which is the stock-length specification for many Honda GX390 and Predator 420-style engines.


Can this rod be used with a Wildcat 460?

Yes. The EC Pinnacle 4.410" rod is specifically designed for the Wildcat 460 and is an excellent choice for modified and stroker combinations.


Can I use this rod with a 72mm stroker crankshaft?

Yes. The rod is designed to work with compatible 72mm stroke crankshaft combinations. When used with a 72mm crankshaft and the stock Wildcat 460 92mm flat-top piston, the combination can produce approximately 478.63cc.


What wrist-pin size does this connecting rod use?

The small-end wrist-pin diameter is 0.789". The piston must have a compatible wrist-pin bore.


What crankshaft journal does this rod fit?

The big-end journal specification is 1.421". Always verify the actual crankshaft crankpin diameter and bearing dimensions before assembly.


Does the connecting rod include a bearing?

Yes. The EC Pinnacle 4.410" rod includes the 6391 rod bearing and rod bolts.


Is this rod suitable for racing engines?

Yes. The billet construction makes it well suited for modified, high-performance, and racing Honda GX390-style big-block engines, including Predator 420 and Wildcat 460 applications.


Will this rod work with any 420cc or 460cc engine?

No. Engine displacement alone does not determine compatibility. Verify the crankshaft journal, wrist-pin diameter, rod length, piston compression height, and block deck height before ordering.


Will a 72mm stroker combination require additional clearance?

It can. Depending on the crankshaft, piston, rod, camshaft, and block combination, a 72mm or longer stroke may require block, rod, piston, or camshaft clearance work. Always mock up and measure the complete rotating assembly before final machining and assembly.

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