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Diamond Pistons

Diamond Pistons Buick 231 Forced Induction Dish Series 21403-6-H 3.8L 3.840B/1.850CD/Kit

SKU: DPP21403-6-H

Pistons
Diamond Pistons Buick 231 Forced Induction Dish Series 21403-6-H 3.8L 3.840B/1.850CD/Kit

Diamond Pistons

Diamond Pistons Buick 231 Forced Induction Dish Series 21403-6-H 3.8L 3.840B/1.850CD/Kit

SKU: DPP21403-6-H

Pistons
A$2,963.72
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 Buick 231 Forced Induction Dish Series pistons are available for a variety of applications, including many GM V6 engines from the 1970s and '80s. Forged from aluminum with two valve reliefs, the dish-style pistons are offered in different bore sizes and numerous other options. Order individually or in a set of 8.

Additional details:

* 1,000 hp rated
* Forced pin oilers from the oil ring
* Pin fitted
* 3-D pockets
* Designed for mild boost applications
* Pins, locks, and support rails (if required) included

Part Type

Pistons

Data: v4.2 - Upd: 2026-09-28 14:13:23

Specifications

Product Attributes - Brand
Diamond Pistons
Product Attributes - Manufacturer's Part Number
21403-6-H
Product Attributes - Part Type
Pistons
Product Attributes - Product Line
Diamond Pistons Buick 231 Forced Induction Dish Series Pistons
Product Attributes - UPC
193564387301
Product Attributes - Piston Rings Included
Yes
Product Attributes - Bore (in.)
3.840 in.
Product Attributes - Bore (mm)
97.536mm
Product Attributes - Stroke
3.400 in.
Product Attributes - Engine Stroke Type
Stock
Product Attributes - Actual Engine Displacement
3.9L/236
Product Attributes - Rod Length
5.960 in.
Product Attributes - Piston Style
Dish, with two valve reliefs
Product Attributes - Piston Material
Forged aluminum
Product Attributes - Compression Height (in.)
1.850 in.
Product Attributes - Piston Head Volume (cc)
+29.50cc
Product Attributes - Wrist Pin Style
Floating
Product Attributes - Wrist Pin Retainers Included
Yes
Product Attributes - Wrist Pin Included
Yes
Product Attributes - Pin Diameter (in.)
0.940 in.
Product Attributes - Piston Ring Thickness
1/16 in. x 1/16 in. x 3/16 in.
Product Attributes - File Fit
Yes
Product Attributes - Gapless
No
Product Attributes - Top Ring Thickness
1/16 in.
Product Attributes - Top Ring Material
Steel
Product Attributes - Top Ring Facing Material
Plasma-moly
Product Attributes - Second Ring Thickness
1/16 in.
Product Attributes - Second Ring Material
Ductile iron
Product Attributes - Second Ring Facing Material
Ductile iron
Product Attributes - Oil Ring Thickness
3/16 in.
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 6.
Product Attributes - Notes
Pistons are 2618 material. Includes H-13 wrist pins.

Reference Information

Brand Name/s Diamond Pistons
StreetFX SKU dpp21403-6-H
SFX Item ID 5525235
Supplier Item Code 5525235
Manufacturer SKU 21403-6-H
Manufacturer UPC 193564387301
Alternative References 3.8L, 3.840B/1.850CD/Kit

Compatibility

Application Data
  • MakeBUICK
    Beginning Year1978
    Ending Year1989
    Engine TypeV6
    Engine FamilyGM V6 GAS
    Engine Size3.8L/231
    Application NotesPistons are 2618 material. Includes H-13 wrist pins.

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