Wiseco

Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 85.50mm - Size +.020 - CR 9.5 Piston Set - K666M855AP

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SKU:
WISK666M855AP
UPC:
00193564089939
MPN:
K666M855AP
Availability:
Regularly stocked product
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$806.99
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Description

Are Wiseco forged pistons the best choice for my 4-cylinder engine?
Wiseco forged pistons offer unparalleled strength for 4-cylinder engines, ensuring professional installation for optimal performance in severe duty applications.

How do Wiseco forged pistons compare to OEM pistons for my 4-cylinder engine?
Engineered for superior durability, Wiseco forged pistons exceed OEM specifications, delivering enhanced combustion stability and preventing engine damage during high-performance use.

WIS Piston Sets - Forged - 4 Cyl are engineered for severe duty performance applications, achieving a usage score of 10 for Racing Competition. Featuring precision ring grooves and an ArmorGlide Skirt Coating, these pistons deliver exceptional power and efficiency. Trust Wiseco forged pistons for race-proven reliability and enhanced engine longevity.

What Owners Say

Owners and enthusiasts consistently praise Wiseco piston sets for delivering high quality at a competitive price point, with many noting they offer better value than comparable alternatives while maintaining the reliability Wiseco has built over decades. The pistons perform well in demanding applications, though some users caution that while the pistons themselves have proven dependable, Wiseco cranks have experienced failures and should be avoided. Builders appreciate the performance gains from higher compression options, and the brand's track record speaks for itself across multiple platforms from LS engines to dirt bikes. Wiseco remains a trusted name in the engine building community for those seeking proven performance without premium pricing.

Key Features

  • Precision ring grooves
  • anti-detonation groove
  • additional ring seal improving features
  • ArmorGlide Skirt Coating
  • Designed and built to withstand heavy to severe duty performance applications
  • Fully machined crown features Forced pin oiling

Why Choose the WIS Piston Sets - 4 Cyl

Delivers superior ring seal for maximum power and efficiency.

Achieves enhanced combustion stability, preventing costly engine damage.

Provides reduced friction and wear for extended engine life.

Transforms your engine's durability for extreme racing demands.

Who Is This For?

Racing Competition — 10/10
Designed and built for severe duty race applications.

Engine Performance — 9/10
Engineered for heavy to severe duty performance.

Track / Autocross — 9/10
Withstands heavy to severe duty performance applications.

Drag Racing — 9/10
Designed for severe duty performance applications.

Street Performance — 7/10
Designed for heavy to severe duty performance.

Frequently Asked Questions

Are Wiseco forged pistons the best choice for my 4-cylinder engine?

Wiseco forged pistons are engineered to withstand heavy to severe duty performance applications for ultimate race-proven reliability. They achieve a score of 10 for Racing Competition usage, confirming their suitability for demanding motorsport. These pistons transform your engine's durability for extreme racing demands.

How do Wiseco forged pistons compare to OEM pistons for my 4-cylinder engine?

Upgrading to Wiseco forged pistons delivers superior ring seal for maximum power and efficiency compared to OEM. They are designed and built to withstand heavy to severe duty performance applications, offering enhanced combustion stability and preventing costly engine damage. This upgrade provides extended engine life through reduced friction and wear.

What is the recommended installation process for Wiseco 4-cylinder forged pistons?

Professional installation is recommended for Wiseco forged pistons, and you should confirm fitment with a qualified technician. This ensures precise ring grooves and anti-detonation features are correctly integrated, maximizing performance. This professional approach guarantees optimal engine longevity and power output.

Will Wiseco forged pistons improve my engine's performance in heavy-duty applications?

Wiseco forged pistons are designed and built to withstand heavy to severe duty performance applications, achieving a score of 9 for Engine Performance usage. They deliver superior ring seal for maximum power and efficiency. This engineering ensures your engine's durability for extreme racing demands.

How can I confirm if Wiseco forged pistons fit my specific 4-cylinder vehicle?

Confirming fitment with your vehicle is essential before installing Wiseco forged pistons. They are designed and built to withstand heavy to severe duty performance applications, offering enhanced combustion stability. This proactive step ensures compatibility and unlocks the full potential of your engine.

Additional Resources

Official Wiseco Product Page

Installation Guide (PDF)

Important Notices

⚠️ CARB Notice: This product is NOT legal for street use in California under CARB (California Air Resources Board) regulations. For off-road or race use only.

⚠️ Proposition 65 Warning: This product can expose you to chemicals including lead and/or other substances known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

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Additional Information

CARB:
This product is not CARB Legal and not for sale in California
Clearance Item:
N
MPN:
K666M855AP
Proposition 65:
Y
Case Lot Quantity:
1
Category:
Engine Components>Piston Sets - Forged - 4cyl
Universal Fitment:
Y
Product Level:
Race Only
Racing Competition:
10/10
Engine Performance:
9/10
Track / Autocross:
9/10
Drag Racing:
9/10
Street Performance:
7/10
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