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Supertech Forged Piston Kit - K-series (K20A-Z)

Supertech Forged Piston Kit - K-series (K20A-Z)

SKU: P4-HK86-P6

Regular price $578.52
Sale price $578.52
Bore & C/R Options
This is an estimated ship date once your order is placed from JHPUSA. Ship dates do not include weekends and holidays.

Supertech pistons are manufactured from extruded high silicon, enhanced 4032 alloy that low thermal expansion, excellent wear resistance and higher thermal conductivity. A phosphate dry lubricant coating is applied to pistons to protect against ring micro welding and enhance skirt lubrication.


  • Forged from enhanced 4032 alloy and CNC machined
  • Contact reduction grooves are standard
  • Honed & reamed pin bores and precise fit
  • High tensile strength and evenly distributed hardness
  • Withstands up to 42psi of turbo boost, w/alcohol, w/out any problems
  • A 2 or 3 forging steps process yeilds a fine structural grain oriented in fibers in the same direction of the stresses.
  • Wrist pins are constructed or cold extruded chrome molly steel for high strength to be used with the wire clip locks.
  • Quality Control is performed after every step of the manufacturing process in climate controlled environments to ensure reliability of dimensions
  • Rings, wrist pins, and wire locks are included.

K20A/A2/A3/Z1/Z3 Bore & Compression Ratio Options: 
(Note: add +.07cr with K20A3 head)

  • 86mm / 9.0cr
  • 86mm / 11.2cr
  • 86mm / 12.0cr
  • 86mm / 12.5cr
  • 86.5mm / 9.0cr
  • 86.5mm / 11.2cr
  • 86.5mm / 12.1cr
  • 86.5mm / 12.5cr
  • 87mm / 11.5cr
  • 87mm / 12.5cr
Product images shown for illustration purposes. Piston style will vary depending on application.


We realize that returns and exchanges are a part of the purchasing process and we do our best to make it as easy as possible. If you are not 100% satisfied with your purchase, you can return your order to JHPUSA within 14 DAYS from the invoice date.

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