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Diamond Pistons

Diamond Pistons Race Series 21557-RS-8 Pistons, Dish, 12 Degree LS2K Series, Forged Aluminum, 4.125 in. Bore, -20.00cc Head Volume, Chevy, LSX, Set of 8

SKU: DPP21557-RS-8

Pistons
Diamond Pistons Race Series 21557-RS-8 Pistons, Dish, 12 Degree LS2K Series, Forged Aluminum, 4.125 in. Bore, -20.00cc Head Volume, Chevy, LSX, Set of 8

Diamond Pistons

Diamond Pistons Race Series 21557-RS-8 Pistons, Dish, 12 Degree LS2K Series, Forged Aluminum, 4.125 in. Bore, -20.00cc Head Volume, Chevy, LSX, Set of 8

SKU: DPP21557-RS-8

Pistons
A$3,395.27
LOW STOCK! Est Ship 4-7 days. HURRY! LOW STOCK. This item is in limited stock at one of our distribution centres. The ETA is the approximate time required to prepare your order for dispatch.
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Description

Diamond Pistons Race Series pistons will withstand some serious horsepower for your high performance engine. These 2618 aluminum pistons are not only significantly lighter than the factory pistons but also superior in strength. The 2618 alloy is specifically for high-horsepower, nitrous, and boosted engines making up to 2,000 hp.

Diamond Pistons Race Series pistons feature:

* 3D milling on piston crowns for "ready to install" finish
* Inside design forging with fully machined underskirts for maximum strength
* Valve pockets designed to work with most aftermarket cylinder heads
* Side gas ports for better ring seal
* Moly skirt coating for friction-loss and skirt-wear protection
* Premium H-13 wrist pins included; chamfered for round wire locks

Part Type

Pistons

Data: v4.2 - Upd: 2026-10-01 01:38:24

Specifications

Product Attributes - Brand
Diamond Pistons
Product Attributes - Manufacturer's Part Number
21557-RS-8
Product Attributes - Part Type
Pistons
Product Attributes - Product Line
Diamond Pistons Race Series Pistons
Product Attributes - UPC
686162209316
Product Attributes - Piston Rings Included
Yes
Product Attributes - Bore (in.)
4.125 in.
Product Attributes - Bore (mm)
104.775mm
Product Attributes - Stroke
4.000 in.
Product Attributes - Engine Stroke Type
Stroked
Product Attributes - Rod Length
6.125 in.
Product Attributes - Piston Style
Dish, with two valve reliefs
Product Attributes - Piston Material
Forged aluminum
Product Attributes - Compression Height (in.)
1.115 in.
Product Attributes - Piston Head Volume (cc)
+20.00cc
Product Attributes - Wrist Pin Style
Press-fit or floating
Product Attributes - Wrist Pin Retainers Included
Yes
Product Attributes - Wrist Pin Included
Yes
Product Attributes - Pin Diameter (in.)
0.927 in.
Product Attributes - Piston Ring Thickness
1.50mm x 1.50mm x 3.00mm
Product Attributes - File Fit
No
Product Attributes - Gapless
No
Product Attributes - Remanufactured
No
Product Attributes - Quantity
Sold as a set of 8.
Product Attributes - Notes
Includes support rails. For use on LSX race engines only.

Reference Information

Brand Name/s Diamond Pistons
StreetFX SKU dpp21557-RS-8
SFX Item ID 5525387
Supplier Item Code 5525387
Manufacturer SKU 21557-RS-8
Manufacturer UPC 686162209316
Alternative References LS2K, -20.00cc

Compatibility

Application Data
  • Application NotesFor use on LSX race engines only.
    Beginning Year1997
    Ending Year2004
    Engine FamilyCHEVY SMALL BLOCK GEN III/IV LS V8 GAS
    Engine Size5.7L/350
    Engine TypeV8
    MakeCHEVROLET
  • Application NotesFor use on LSX race engines only.
    Beginning Year1999
    Ending Year2007
    Engine FamilyCHEVY SMALL BLOCK GEN III/IV LS V8 GAS
    Engine Size4.8L/294
    Engine TypeV8
    MakeCHEVROLET
  • Application NotesFor use on LSX race engines only.
    Beginning Year1999
    Ending Year2007
    Engine FamilyCHEVY SMALL BLOCK GEN III/IV LS V8 GAS
    Engine Size5.3L/325
    Engine TypeV8
    MakeCHEVROLET
  • Application NotesFor use on LSX race engines only.
    Beginning Year1999
    Ending Year2007
    Engine FamilyCHEVY SMALL BLOCK GEN III/IV LS V8 GAS
    Engine Size6.0L/364
    Engine TypeV8
    MakeCHEVROLET
  • Application NotesFor use on LSX race engines only.
    Beginning Year2005
    Ending Year2014
    Engine FamilyCHEVY SMALL BLOCK GEN III/IV LS V8 GAS
    Engine Size5.3L/325
    Engine TypeV8
    MakeCHEVROLET
  • Application NotesFor use on LSX race engines only.
    Beginning Year2005
    Ending Year2017
    Engine FamilyCHEVY SMALL BLOCK GEN III/IV LS V8 GAS
    Engine Size4.8L/294
    Engine TypeV8
    MakeCHEVROLET
  • Application NotesFor use on LSX race engines only.
    Beginning Year2005
    Ending Year2020
    Engine FamilyCHEVY SMALL BLOCK GEN III/IV LS V8 GAS
    Engine Size6.0L/364
    Engine TypeV8
    MakeCHEVROLET
  • Application NotesFor use on LSX race engines only.
    Beginning Year2008
    Ending Year2017
    Engine FamilyCHEVY SMALL BLOCK GEN III/IV LS V8 GAS
    Engine Size6.2L/376
    Engine TypeV8
    MakeCHEVROLET

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