Product Summary

Dome Piston Style, Forged Aluminum Piston Material

  • Specifically designed for the Chevy 421 c.i. engine with a 4.125" bore and 3.875" stroke
  • Features lateral gas porting on higher compression ratios
  • Made from high ductility 2618 aluminum alloy with a natural finish
  • Available in standard or several oversize dimensions to better match your application
  • Piston weighs only 427 grams and the wrist pin weighs 102 grams
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Key Specs

MFG. Part #
Piston StyleDome
Piston MaterialForged Aluminum
Wrist Pin IncludedYes
Wrist Pin StylePress-Fit or Floating
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Need To Know

Quick and Easy Returns

Return Policy

Details

Formerly KB Forged Pistons. Starting with 2618 alloy heat treated to high strength T-6 specifications, these give you the best value for your money. Exclusive V-rib adds strength without adding weight but allows maximum cooling.

  • High ductility 2618 alloy
  • Dual forced pin oiling on most applications
  • Lateral gas porting on higher compression ratios
  • Fully machined with deep valve pockets
  • Second land accumulator grooves
  • Top land mini groove technology
  • Diamond finished skirts
  • Triple wound spiral locks

For Chevy 421 c.i. (4.125" bore x 3.875" stroke). Use Style E rings (1.5mm, 1.5mm, 3.0mm).

Item Details

Piston Weight: 427 g. Rod Length: 6.0"
Bore & Stroke: 4.125 x 3.875
Ring Style: E

Charts

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Specifications

KEY SPECS
MFG. Part #
BrandIcon Pistons
Garage Sale TypeDiscontinued
Piston StyleDome
Piston MaterialForged Aluminum
Wrist Pin IncludedYes
Wrist Pin StylePress-Fit or Floating
GENERAL
Piston Diameter
Dome Height.218"
Stroke3.875"
Connecting Rod Length6.000"
Piston Weight427 grams
Piston Ring StyleE
Wrist Pin Diameter0.9270"
Wrist Pin Weight102 grams
Top Ring Thickness1.5 mm
Second Ring Thickness1.5 mm
Oil Ring Thickness3.0 mm
GTIN Code
Sold in QuantitySet

Questions & Answers

3 Questions • 3 Answers

Will these work on 18 degree heads or 23 degree only

by DD

• 4 years ago

1 answer

Can u use a dart iron eagle 49 cc head with these pistons?

by Danny

• 9 years ago

1 answer

what is the compression ratio with 64cc heads

by wrichard1986

• 11 years ago

1 answer

3 of 3 questions shown

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