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![2-6020-4000D FX-Series Flat Top Piston Set for 1965-1981 Big Block Oldsmobile, 4 in. Bore, -12cc Volume [OEM Stroke]](https://www.jegs.com/images/mini_750/900/915/915-2-6020-4000d.jpg)
Vehicle Info NeededDSS RACINGPART NUMBER: 915-2-6020-4000D
2-6020-4000D FX-Series Flat Top Piston Set for 1965-1981 Big Block Oldsmobile, 4 in. Bore, -12cc Volume [OEM Stroke]
$77995
Ships on 09/14/2026
Lowest Price GuaranteeOldsmobile
FX-Series Flat Top Piston Set1965-1981 Big Block Oldsmobile Bore: 4.000 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 2-6020-4000D 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-DM400-4000
- Ring Series: DM400
- Fits Base Engine: 425
- Compression Ratio: 72cc-9.88, 75cc-9.60, 77cc-9.43
- 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: Without Rings
- Total Valve Reliefs: 2
Part TypePiston
BrandDSS RACING
Package Height7.0
Package Width8.5
Package Length8.5
Weight16.0 PG
Part CategoryPerformance Parts
Pin Lock Rings IncludedYes
Compression Height (In)1.625
Bore (In)4
Wrist Pin StylePress or Full Floating
QuantitySet of 8
Piston Head Volume-12cc
Piston StyleFlat Top
Compression Ratio72cc-9.88, 75cc-9.60, 77cc-9.43
Ring Thickness1/16-1/16-3/16"
Piston MaterialForged 2618
Pin Diameter (In)0.98
Part FitmentSemi Universal
Wrist Pin IncludedYes
Snap Rings IncludedYes
Vendor Part Number2-6020-4000D
Package Qty1
Package TypeEA
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