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Diamond Pistons Big Block 20 Degree Competition Series 21003-8 - 1200HP Rated - 2618 Material - Coated Skirts - Includes Pins and Rings

SKU: DPP21003-8

Pistons

Diamond Pistons Big Block 20 Degree Competition Series 21003-8 - 1200HP Rated - 2618 Material - Coated Skirts - Includes Pins and Rings

SKU: DPP21003-8

Pistons
A$3,772.40
Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.
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Description

Diamond Pistons Big Block 20 Degree Competition Series pistons are available for a variety of applications—including many Chevrolet V-8 engines from 1965-90. Forged from aluminum with single valve relief, these dome-style pistons are offered in different bore, stroke, and rod length sizes—along with several other options. They're designed for use with Brodix SR20 and Dart 20 degree cylinder heads.

Additional details:

* Forced pin oilers from the oil ring
* Pin fitted
* Vertical gas ports
* Moly coated skirts
* 3-D dome and pockets
* Inboard forging
* H-13 pins, support rails and locks included

Part Type

Pistons

Data: v4.2 - Upd: 2026-09-28 14:13:22

Specifications

Product Attributes - Brand
Diamond Pistons
Product Attributes - Manufacturer's Part Number
21003-8
Product Attributes - Part Type
Pistons
Product Attributes - Product Line
Diamond Pistons Big Block 20 Degree Competition Series Pistons
Product Attributes - UPC
686162208456
Product Attributes - Piston Rings Included
Yes
Product Attributes - Bore (in.)
4.625 in.
Product Attributes - Bore (mm)
117.475mm
Product Attributes - Stroke
4.375 in.
Product Attributes - Engine Stroke Type
Stroked
Product Attributes - Rod Length
6.385 in.
Product Attributes - Piston Style
Dome, with single valve relief
Product Attributes - Piston Material
Forged aluminum
Product Attributes - Compression Height (in.)
1.215 in.
Product Attributes - Piston Head Volume (cc)
-27.94cc
Product Attributes - Wrist Pin Style
Floating
Product Attributes - Wrist Pin Retainers Included
Yes
Product Attributes - Wrist Pin Included
Yes
Product Attributes - Pin Diameter (in.)
0.990 in.
Product Attributes - Piston Ring Thickness
0.043 in. x 0.043 in. x 3.00mm
Product Attributes - File Fit
Yes
Product Attributes - Gapless
No
Product Attributes - Top Ring Thickness
0.043 in.
Product Attributes - Top Ring Material
Ductile iron
Product Attributes - Top Ring Facing Material
Plasma-moly
Product Attributes - Second Ring Thickness
0.043 in.
Product Attributes - Second Ring Material
Ductile iron
Product Attributes - Second Ring Facing Material
Ductile iron
Product Attributes - Oil Ring Thickness
3.0mm
Product Attributes - Oil Ring Material
Stainless steel
Product Attributes - Oil Ring Tension
Standard
Product Attributes - Remanufactured
No
Product Attributes - Quantity
Sold as a set of 8.
Product Attributes - Notes
Pistons are 2618 material. Includes H-13 wrist pins.

Reference Information

Brand Name/s Diamond Pistons
StreetFX SKU dpp21003-8
SFX Item ID 5525194
Supplier Item Code 5525194
Manufacturer SKU 21003-8
Manufacturer UPC 686162208456
Alternative References 1200HP

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year1970
    Ending Year1990
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size7.4L/454
    Application NotesFor use with Brodix SR20 or Dart 20 degree cylinder heads.

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