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EC 76mm or 2.99-Inch Piston Assembly
EC 76mm Piston for Tillotson R-Series Blocks
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EC 76mm or 2.99-Inch Piston Assembly

Part Number: WC-0100
Online Price: $89.99
Phone Order Price:$109.99
You Save:$20.00(18%)
EC 263R Piston Assembly – 76mm Hypereutectic Piston for Tillotson R-Series Engines
Availability: In Stock.

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Description

263R Rotating Assembly – 76mm Hypereutectic Piston for Tillotson R-Series Blocks


Build your ultimate performance engine with the EC 263R Rotating Assembly, specifically engineered for Tillotson R-Series blocks bored to 76mm. This kit features a new 76mm hypereutectic piston, crafted from the same high-silicon alloy used in the proven Tillotson 72mm Racing Piston—now scaled up for big displacement performance without sacrificing strength or budget.


Why Choose the 263R Piston Assembly?

The 76mm piston delivers increased displacement—3" bore—for serious power gains. Despite its larger size, the piston assembly weighs just 195g, making it lighter than many smaller-diameter pistons on the market. Less weight means better balance, quicker acceleration, and improved durability under high-RPM loads.


The 13mm wrist pin is longer and the journal wider than the 72mm version, adding structural integrity while supporting high-performance builds. The shorter compression height of .715" (vs. .765") allows for longer billet rods like our 8282 Pinnacle Rod, optimized for use with a 58mm crankshaft to create a true 263cc engine.


?? Comparative Piston Assembly Weights

Piston Type

Weight (g)

EC 76mm Hypereutectic Piston

190g

68mm Lightweight Clone Dish

207g

70mm Predator Hemi Flat Top

203g

72mm Tillotson Racing Piston

172g

2.8335" Wiseco Single Ring

192g

2.985" Wiseco Single Ring

208g

The EC 76mm piston is up to 17g lighter than smaller pistons and 18g lighter than similarly sized forged pistons—without the premium price.


Piston Specs:

  • Bore: 76mm (2.99")
  • Crown: Flat Top
  • Compression Height: .715"
  • Material: Hypereutectic Alloy
  • Piston Assembly Weight: 190g (includes rings, pin, clips)

Ring Specs:

  • Top Ring: 1.1mm
  • Second Ring: 1.4mm
  • Oil Ring: 1.8mm

Wrist Pin Specs:

  • Diameter: 13mm
  • Length: 44mm
  • Wall Thickness: 1.9mm


?? Key Benefits:

  • Lightweight yet strong piston for high-RPM builds
  • Affordable upgrade for 263cc stroker kits
  • Improved rod compatibility with lower compression height
  • Ideal for race engines where balance, power, and cost matter


Note: Requires block bored to 76mm and compatible billet rod. Pair with our 58mm crankshaft and 8282 rod for the full EC 263R rotating assembly setup.


FAQ

Q1: What engine blocks is this piston compatible with?
A: The 76mm hypereutectic piston is designed specifically for Tillotson R-Series blocks that have been bored out to a 76mm diameter. It is not compatible with standard 212cc or 225cc blocks unless modified.


Q2: What crankshaft and rod should I use with this piston?
A: To build a complete 263cc engine, use a 58mm stroke crankshaft and our 8282 billet connecting rod, which is designed for the shorter compression height of .715".


Q3: How does the weight compare to other pistons?
A: The 76mm piston assembly weighs just 190g, making it lighter than many smaller or similarly sized options. For example, it’s 17 grams lighter than a 68mm clone piston and even lighter than some Wiseco forged pistons of similar diameter.


Q4: What are the benefits of a hypereutectic piston?
A: Hypereutectic pistons have higher silicon content, which offers better heat resistance, less expansion, and improved wear characteristics compared to standard cast pistons—ideal for performance applications.


Q5: What compression height does the piston use?
A: The piston has a .715" compression height, which is lower than standard clone pistons (.765"). This allows for the use of longer rods for improved rod angle and power delivery.


Q6: Does this come with rings and a wrist pin?
A: Yes, the full piston assembly includes the rings, 13mm wrist pin (44mm length), and clips.

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