Product Summary

350, Flat Top w/ 2 valve reliefs Piston Style

  • The reflective alloy allows 2% power increase
  • Features fully machined crowns and valve reliefs
  • Has drilled oil drain backs and full floating wrist pins
  • Specially quench dome technology minimizes deterioration
  • Made entirely from 390 Hypereutectic alloy that weighs only 600 grams

Key Specs

MFG. Part #
Piston StyleFlat Top w/ 2 valve reliefs
Piston MaterialHypereutectic Aluminum
Wrist Pin IncludedYes
Wrist Pin StylePress-Fit or Floating

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Keith Black Hypereutectic pistons are favored for their improved power and reduced scuffing. The unique design & manufacturing processes combine to produce a rigid piston, which will rock less in the bore improving ring seal. These T-5 heat treated pistons also offer reduced thermal expansion, which allows you to run tighter clearances and allows the piston rings to seal better and minimize blow-by.

For S/B Chevy 350 c.i. (4.000" bore x 3.48" stroke).

  • 390 Hypereutectic alloy
  • Fully machined crowns and valve reliefs
  • Drilled oil drain backs
  • Full floating wrist pins
  • Triple wound spiral locks
  • Reflective alloy allows 2% power increase
  • Quench dome technology minimizes deterioration
  • Zero deck quench designs
  • Lightweight wrist pins

Item Details

C/R 58cc=10.9, 64cc=10.2, 76cc=8.9
Piston/Pin Weight: 605 g
Rod Length: 6.0", Ring Style: C



  • Comp Height 5.7" Rod -  1.561
  • Comp Height 6.0" Rod -  1.261
  • Pin Diameter -  0.9272

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.


MFG. Part #
BrandKeith Black
Piston StyleFlat Top w/ 2 valve reliefs
Piston MaterialHypereutectic Aluminum
Wrist Pin IncludedYes
Wrist Pin StylePress-Fit or Floating
Speedway Motors Catalog Part #474-112
Piston Diameter
Connecting Rod Length6.000"
Piston Weight
Piston Ring StyleC
Wrist Pin Diameter0.9272"
Wrist Pin Weight145 grams
Compression 58cc =10.9 : 1
Compression 64cc =10.2 : 1
Compression 76cc =8.9 : 1
Sold in QuantitySet