K420B8 - Wiseco Pistons - Professional Series

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Part #: K420B8
Notes: BBC BIG CHF 3815 HEAD +15.6cc (6420B8)
Set of 8 Pistons
MSRP: $888.84
Your Price: $844.40

This Item Also Available In

Part Number Price Notes & Specs
6008LA3 $99.62 Notes CHEVY SMALL BLOCK 1.550 4030A
Replacement/Individual Piston (Left)
6011RA35 $87.53 Notes CHEV SMALL BLOCK FT 1.550 4035A
Replacement/Individual Piston (Right)
6014LA3 $107.60 Notes CHEVY SMALL BLK RD 1.250 4030A
Replacement/Individual Piston (Left)
6081LA6 $99.62 Notes CHEVY SMALL BLK DRAG 1.250CH 4060A
Replacement/Individual Piston (Left)
6098RA6 $104.44 Notes CHEVY SMALL BLOCK 1.120 4060A
Replacement/Individual Piston (Right)
6116LA4 $104.44 Notes CHEV SMALL BLK FT 1.120 4040A
Replacement/Individual Piston (Left)
6167LAS $96.60 Notes CHEV SMALL BLK XLS FT 1.550 4004A
Replacement/Individual Piston (Left)
6183LA3 $106.30 Notes CHEV SMALL BLK FT 1.120 4155A
Replacement/Individual Piston (Left)
6184LF3 $105.66 Notes CHEV SMLL BLK XLS FT 1.250 4032GF
Replacement/Individual Piston (Left)
6208RA3 $111.82 Notes CHEV SMALL BLOCK RD 1.250 4155A
Replacement/Individual Piston (Right)
6241A125 $107.45 Notes CHEVY BIG BLCK DRAG 1.120 4375A
Replacement/Individual Piston
6308A3 $102.63 Notes CHEV BIG BLK MINI DOME 1.645 4280A
Replacement/Individual Piston
6314A3 $102.63 Notes CHEVY BIG BLK DRAG 1.645 4530A
Replacement/Individual Piston
6332A100 $102.63 Notes CHEV BIG BLOCK RD 1.645CH 4350A
Replacement/Individual Piston
6353LF4 $96.60 Notes CHEVY XLS L.W. FT 1.550 4042GF
Replacement/Individual Piston (Left)
6354RAS $104.44 Notes CHEV SMALL BLK 18o 1.060 4125A
Replacement/Individual Piston (Right)
6356A4 $99.62 Notes FORD WINDSOR DRAG HD 1.600 CH 4040A
Replacement/Individual Piston
6388LAS $99.62 Notes CHEVY FULL ROUND +8.9 4004A
Replacement/Individual Piston (Left)
6388RA2 $99.62 Notes CHEVY FULL ROUND +8.9 4020A
Replacement/Individual Piston (Right)
6388RAS $99.62 Notes CHEVY FULL ROUND +8.9 4004A
Replacement/Individual Piston (Right)
6400RBS $110.48 Notes SB CHEVY EXTREME 1.12CH +12.5
Replacement/Individual Piston (Right)
6415RBS $105.66 Notes CHEVY XLS PRO-SERIES 1.250
Replacement/Individual Piston (Right)
6416LBS $110.48 Notes CHEVY XLS PRO-SERIES 1.125
Replacement/Individual Piston (Left)
6416RBS $110.48 Notes CHEVY XLS PRO-SERIES 1.125
Replacement/Individual Piston (Right)
6420B125 $110.48 Notes BBC BIG CHIEF 3815 HEAD +15.6cc 4625B
Replacement/Individual Piston

All Fitments

Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes

Product Description

World renowned for their work building race winning pistons, Wiseco utilizes experience from a diverse background of the most sophisticated engines in such venues as Formula 1, Indy Racing League (IRL), NHRA Pro Stock, Moto GP, AMA Superbike, AMA Motocross and Supercross to design and manufacture the highest technology pistons available.


  • Valve Pocket designs that allow maximum flow around valve, also allowing oversized valves and high lift cams to be utilized.
  • Piston Crown shapes designed to promote maximum Intake Charge efficiency through scavenging mixture “Cross Flow” during intake and
    exhaust valve overlap. More fuel and air equals more horsepower!
  • Piston Domes designed for optimal quench during the compression/ combustion cycle, resulting in resistance to detonation and preignition.
    The end result is longer engine life and increased horsepower potential.
  • Precision machined ring grooves with proper orifice/accumulator volume feature calculated groove root diameters and axial widths, providing
    excellent surface finish and flatness, maximum ring seal and minimized blow-by and oil consumption.
  • World class, ISO Certified, forging facility that utilizes the latest technologies – Featuring complex forged shapes, advanced materials, and feature-aligned grain flow technology.
  • Complex Piston skirt profiles that reduce power robbing friction, yet promote stability in the bore for optimum ring seal.

ArmorGlide Skirt Coating
Wiseco’s new ArmorGlide skirt coating is the result of testing, development, and benchmarking through our in-house dyno program. The outcome – minimized friction, maximum horsepower, and improved wear resistance.

Not only is ArmorGlide a high-tech lubricant that reduces friction, but it also allows the piston to be fitted tighter within the bore than a non-coated piston. Better ring seal reduces noise from piston rock. ArmorGlide is being applied to selected pistons.

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