Made in USA
K2-6020-4125D FX-Series Flat Top Piston Set for 1965-1981 Big Block Oldsmobile, 4.125 in. Bore, -12cc Volume [OEM Stroke]
InfoVehicle Info Needed
DSS RACINGPART NUMBER: 915-K2-6020-4125

K2-6020-4125D FX-Series Flat Top Piston Set for 1965-1981 Big Block Oldsmobile, 4.125 in. Bore, -12cc Volume [OEM Stroke]

$86495
ShippingShips on 11/17/2026
Lowest PriceLowest Price Guarantee

Items You Need

Engine Assembly Lube [4 oz. Bottle]

JEGS

Engine Assembly Lube [4 oz. Bottle]

Part Number : 555-28000
$599$6.99
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Piston Ring Pliers Installs and Removes Rings without Breakage

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Piston Ring Pliers Installs and Removes Rings without Breakage

Part Number : 555-80845
$647$6.99
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Piston Installation Kit Includes: Universal Ring Squaring Tool, Ring Compressor, & Heavy Duty Piston Install Tool

PROFORM

Piston Installation Kit Includes: Universal Ring Squaring Tool, Ring Compressor, & Heavy Duty Piston Install Tool

Part Number : 778-67652K3
$9548
Wrinkle Band Ring Compressor Adjustable for 3" -5" Bore Sizes

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Wrinkle Band Ring Compressor Adjustable for 3" -5" Bore Sizes

Part Number : 555-W80574
$1599$17.99
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Oldsmobile
FX-Series Flat Top Piston Set
  • 1965-1981 Big Block Oldsmobile
  • Bore: 4.125 in.
  • Head Volume: -12cc
  • Material: Forged 2618
  • Pin Diameter: .980 in.
  • Pin Style: Press or Full Float
  • Ring Thickness: 1/16-1/16-3/16 in.
  • OEM Stroke
  • Set of 8

    DSS Racing K2-6020-4125D Features:

    • Strong, Heat Resistant 2618 Alloy
    • Proprietary "DMAX" Multi Stage Forging Process, Produces' a Superior Forging
    • Patented "X Groove" Skirt for Superior Cylinder & Ring Performance & Durability
    • Advanced Ring Lands Featuring a Combination of Accumulators and Drilling Ops.
    • 6 additional areas of CNC milling for weight reduction in non critical areas.
    • Thinner Ring Grooves Maximize Critical Ring Land Strength
    • Larger CNC Machined Valve Reliefs for More Aggressive Head & Cam Combinations
    • Heavy-Duty Piston Pins
    • Double True Arc Pin Locks, Provide Redundancy
    • Precision CNC Finished Pin Bores
    • Drilled Forced Wrist Pin Oiling
    • Drilled Bottom Ring Land Intersecting Oil Drain Backs
    • Advanced Profile Precision Diamond-Turned Skirts
    • Ring Set Required: RS-DM400-4125
    • Ring Series: DM400
    • Fits Base Engine: 425
    • Compression Ratio: 72cc-10.39, 75cc-10.09, 77cc-9.91
    • Calculated Zero Deck: 10.6125
    • Compression Height: 1.625 in.
    • Rod Length: 7 in.
    • Stroke: 3.975 in. (OEM Stroke)
    • Pin Locking Rings Included: Yes
    • Wrist Pin Included: Yes
    • Oil Rail Support Ring Included: N/A
    • With Rings Without Rings: With Rings
    • Total Valve Reliefs: 2
  • Part TypePiston
    BrandDSS RACING
    Package Height10.0
    Package Width10.0
    Package Length10.0
    Weight17.0 PG
    Part CategoryPerformance Parts
    Part FitmentSemi Universal
    Vendor Part NumberK2-6020-4125
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning