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EC 72.5mm / 2.854” Forged Racing Piston Assembly
EC Forged 72.5mm / 2.854" Racing Piston Assembly
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EC 72.5mm / 2.854” Forged Racing Piston Assembly

Part Number: WC-203-K
Online Price: $89.99
Phone Order Price:$109.99
You Save:$20.00(18%)
EC 72.5mm Forged Racing Piston Assembly – Slipper Skirt Big Bore Piston for Tillotson & Wildcat Engines
Availability: In Stock.

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Description

EC 72.5mm / 2.854” Forged Racing Piston Assembly


Lightweight Slipper-Skirt Forged Piston for 72.5mm Big-Bore High-Performance Engines


The EC 72.5mm Forged Racing Piston is purpose-built for serious racers pushing the limits of big-bore small-block engines. Engineered for maximum strength, reduced rotating weight, and improved clearance, this piston delivers reliability and performance in demanding karting, mini bike, and open-mod applications.

Forged from premium billet aluminum and shaped using high-pressure deformation, this piston offers superior ductility and durability compared to cast, billet-machined, or hypereutectic pistons. It is ideal for engines operating at high RPM, under high compression, or in extreme racing environments.


Why Choose an EC Forged Racing Piston?

Forged pistons realign the aluminum grain structure, producing a stronger, tougher component that withstands:

  • High cylinder pressures
  • Long-duration high RPM
  • Detonation-prone environments
  • Increased heat cycles

This makes forged pistons the preferred choice for endurance racing and open-mod builds where reliability is critical.


Key Design Advantages

72.5mm / 2.854” Big-Bore Fitment

Directly compatible with oversized(.5mm/.020”)72mm+ big-bore blocks, including:

  • Tillotson 72mm Bore (225-240cc)
  • Wildcat 240RS and similar 72–72.5mm blocks

Lightweight Slipper-Skirt Profile

  • Reduces reciprocating mass
  • Decreases friction
  • Provides added clearance for stroker crankshafts

Shorter Compression Height

Compared to the Tillotson 72mm piston:

  • Allows use of longer connecting rods
  • Helps reduce total rotating assembly weight
  • Enhances rod-ratio and high-RPM stability

Anti-Friction Skirt Coating

  • Reduces wear during cold starts
  • Improves durability under extended high-RPM operation
  • Helps maintain skirt integrity in high-load racing engines


Fitment Notes & Rod Compatibility

Compression height differences mean deck height varies depending on rod/crank combination.

Example:
With an 8279 rod and 58mm crankshaft:

  • EC 72.5mm piston: >0.100" in the hole
  • Tillotson 72.5mm piston: near zero deck

To achieve proper deck height, compression, and quench, use the recommended combinations below.


Recommended Rod & Crankshaft Pairings

Tillotson 236cc (72mm Bore, 58mm Stroke)

  • Rod: #8290
  • Crankshaft: 58mm


Tillotson 240cc (72mm Bore, 59mm Stroke)

  • Rod: #8289
  • Crankshaft: 59mm

These configurations provide optimal compression height and piston-to-deck alignment for performance builds.


Piston Assembly Includes

  • 1x EC 72.5mm / 2.854" Forged Racing Piston
  • 1x Ring Set for 72mm pistons
  • 1x 13mm Wrist Pin
  • 2x Wrist Pin Clips

FAQ

What engines does the EC 72.5mm forged piston fit?

This piston fits big-bore small-block racing engines with an oversized 72.5mm bore, including Tillotson 225R/228R/236R/236RX/240R/240RX, Wildcat 240RS, and similar aftermarket blocks.


Do I need a specific connecting rod for this piston?

Yes. Because this piston has a shorter compression height, the correct rod is needed to achieve proper deck height.

  • 236cc (58mm stroke): Use Rod #8290
  • 240cc (59mm stroke): Use Rod #8289


Why choose a forged piston over cast or billet pistons?

Forged pistons are significantly stronger due to their grain-aligned forging process. They handle high cylinder pressures, high RPM, detonation, and extreme heat far better than cast or billet pistons.


What are the benefits of the slipper-skirt design?

A slipper-skirt piston reduces weight, decreases friction, and provides additional clearance for stroker crankshafts—ideal for high-RPM racing and improved throttle response.


Does the piston include rings and hardware?

Yes. The assembly includes the forged piston, ring set, 13mm wrist pin, and two wrist pin clips.


Is this piston coated?

Yes. It features an anti-friction skirt coating that improves durability and reduces wear during high-RPM operation.


Can I use this piston with stock engines?

This piston is designed for high-performance racing engines, not stock blocks. It should only be used in big-bore aftermarket blocks designed for 72–72.5mm pistons.


Will this piston improve compression?

Compression depends on your rod and crank combination. With the correct rod pairing, you can optimize deck height and achieve proper compression for your build.

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