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Sealed Power

Speed-Pro Forged Pistons L2291F40 Pistons, Forged, Flat, 4.090 in. Bore, Ford, Mercury, Set of 8

SKU: SLPL2291F40

Pistons
Speed-Pro Forged Pistons L2291F40 Pistons, Forged, Flat, 4.090 in. Bore, Ford, Mercury, Set of 8

Sealed Power

Speed-Pro Forged Pistons L2291F40 Pistons, Forged, Flat, 4.090 in. Bore, Ford, Mercury, Set of 8

SKU: SLPL2291F40

Pistons
A$1,254.24
IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

Speed-Pro forged pistons are made from extruded VMS-75 aluminum alloy that's forged under 3,000 tons of pressure to "near-net" shape. After that, they're machined to their final configuration. These pistons offer excellent strength and durability—and are capable of taking the punishment that's dished out on the street and in competition. They're available for a wide variety of applications, including OE replacements and all-out racing engines.

Part Type

Forged Piston

Data: v4.2 - Upd: 2026-09-30 14:11:32

Specifications

Product Attributes - Brand
Sealed Power
Product Attributes - Manufacturer's Part Number
L2291F40
Product Attributes - Part Type
Pistons
Product Attributes - Product Line
Speed-Pro Forged Pistons
Product Attributes - UPC
087674132909
Product Attributes - Piston Rings Included
No
Product Attributes - Bore (in.)
4.090 in.
Product Attributes - Bore (mm)
103.886mm
Product Attributes - Stroke
3.780 in.
Product Attributes - Engine Stroke Type
Stock
Product Attributes - Rod Length
6.480 in.
Product Attributes - Piston Style
Flat top, with four valve reliefs
Product Attributes - Piston Material
Forged aluminum
Product Attributes - Compression Height (in.)
1.776 in.
Product Attributes - Piston Head Volume (cc)
+10.00cc
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.)
0.975 in.
Product Attributes - Piston Ring Thickness
5/64 in. x 3/32 in. x 3/16 in.
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
DurOshield® coated piston skirt.

Reference Information

Brand Name/s Sealed Power
StreetFX SKU slpL2291F40
SFX Item ID 5029508
Supplier Item Code 5029508
Manufacturer SKU L2291F40
Manufacturer UPC N/A
Alternative References SEAL2291F40

Compatibility

Application Data
  • MakeFORD
    Beginning Year1961
    Ending Year1976
    Engine TypeV8
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesDeck clearance 0.015 inch. Skirt clearance 0.0020 inch.
  • MakeFORD
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesOriginal equipment replacement for engine VIN codes P, S or Z.
  • MakeFORD
    Beginning Year1968
    Ending Year1968
    Engine TypeV8
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesOriginal equipment replacement for engine VIN codes S or Z.
  • MakeFORD
    Beginning Year1969
    Ending Year1969
    Engine TypeV8
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesOriginal equipment replacement for engine VIN code Z.
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application Notes.040" Oversize Powerforged 3 Ring Groove Piston Ring Groove Widths: 5/64, 3/32, 3/16 (in.) 1.776 CD Flat, 4 reliefs DUROSHIELD skirt coated piston
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application Notes0.040in Oversize Powerforged piston 3 Ring Piston Ring Groove Widths: 5/64in , 3/32in , 3/16in 1.776in Compression Distance Flat Head Piston with 4 Valve Reliefs DUROSHIELD Skirt Coated Piston
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 1 Ring(s) 5/64 Groove 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs; DUROSHIELD« skirt coated piston; .040" Oversize
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 1 Ring(s) 5/64 Groove 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs; DUROSHIELD® skirt coated piston; .040" Oversize
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 1 Ring(s) 5/64 Groove 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs DUROSHIELD® skirt coated piston
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 1 Ring(s) 5/64 Groove 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 5/64 Groove 1 Ring(s) 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs; DUROSHIELD« skirt coated piston; .040" Oversize
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 1 Groove(s) 5/64 3/32 3/16 1.776 CD Flat, 4 reliefs DUROSHIELD skirt coated piston; .040" Oversize
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 1 Groove(s) 5/64 3/32 3/16 1.776 CD Flat, 4 reliefs DUROSHIELD® skirt coated piston; .040" Oversize
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged piston 3 Ring Piston Ring Groove Widths: 5/64in , 3/32in , 3/16in 1.776in Compression Distance Flat Head Piston with 4 Valve Reliefs DUROSHIELD Skirt Coated Piston 0.040in Oversize
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged piston 3 Ring Piston Ring Groove Widths: 5/64in , 3/32in , 3/16in 1.776in Compression Distance Flat Head Piston with 4 Valve Reliefs DUROSHIELD Skirt Coated Piston Sold as Set Priced Individually 0.040in Oversize
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged piston Sold as Set
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1967
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesSold as Set Priced Individually
    Engine VIN CodeP
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1968
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application Notes.040" Oversize Powerforged 3 Ring Groove Piston Ring Groove Widths: 5/64, 3/32, 3/16 (in.) 1.776 CD Flat, 4 reliefs DUROSHIELD skirt coated piston
    Engine VIN CodeZ
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1968
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application Notes0.040in Oversize Powerforged piston 3 Ring Piston Ring Groove Widths: 5/64in , 3/32in , 3/16in 1.776in Compression Distance Flat Head Piston with 4 Valve Reliefs DUROSHIELD Skirt Coated Piston
    Engine VIN CodeZ
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1968
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 1 Ring(s) 5/64 Groove 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs; DUROSHIELD« skirt coated piston; .040" Oversize
    Engine VIN CodeZ
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1968
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 1 Ring(s) 5/64 Groove 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs; DUROSHIELD® skirt coated piston; .040" Oversize
    Engine VIN CodeZ
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1968
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 1 Ring(s) 5/64 Groove 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs DUROSHIELD® skirt coated piston
    Engine VIN CodeZ
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1968
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 1 Ring(s) 5/64 Groove 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs
    Engine VIN CodeZ
  • MakeFORD
    ModelCOUNTRY SEDAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1968
    Engine TypeV8
    Liter6.4
    CID390
    CC6391
    Engine FamilyFORD BIG BLOCK FE V8 GAS
    Engine Size6.4L/390
    Application NotesPowerforged 0.9752" Pin Dia. 5/64 Groove 1 Ring(s) 3/32 Groove 3/16 Groove 1.776 CD Flat, 4 reliefs; DUROSHIELD« skirt coated piston; .040" Oversize
    Engine VIN CodeZ

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