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DSS Racing Pistons 1-5070-4050; FX Series 4.050 in. -5.00 cc Flat Top for 1958 to 1976 Ford 390 FE
$689.95
Details
- 4032 Alloy
- Strong, Endurance Minded, Wear Resistant, Low Maintenance, 4032 Alloy
- Substantially Stronger than Hypereutectic Type Cast Pistons
- Proprietary "DMAX" Multi Stage Forging Process, Produces' a Superior Forging
- Drilled Forced Wrist Pin Oiling
- Drilled Bottom Ring Land Intersecting Oil Drain Backs
- Forged and Machined in Saint Charles Illinois USA!
- Boost and NOS Ready! (Moderate to High Levels)
- Fully Machined Piston Crown
- Advanced Profile Precision Diamond-Turned Skirts
- Larger CNC Machined Valve Reliefs for More Aggressive Head & Cam Combinations
- Heavy-Duty Piston Pins
- Precision CNC Finished Pin Bores
- Double True Arc Pin Locks Provide Redundancy
- Full-Floating or Press Fit
- 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
- Patented "X Groove" Skirt for Superior Cylinder & Ring Performance & Durability
- CNC Tear out notch makes optional Spiro Locs removal easy.
- Drilled Forced Wrist Pin Oiling
- Drilled Bottom Ring Land Intersecting Oil Drain Backs
- Forged and Machined in Saint Charles Illinois USA!
- Boost and NOS Ready! (Moderate to High Levels)
- Fully Machined Piston Crown
- Advanced Profile Precision Diamond-Turned Skirts
- Larger CNC Machined Valve Reliefs for More Aggressive Head & Cam Combinations
- Heavy-Duty Piston Pins
- Precision CNC Finished Pin Bores
- Double True Arc Pin Locks Provide Redundancy
- Full-Floating or Press Fit
- 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
- Patented "X Groove" Skirt for Superior Cylinder & Ring Performance & Durability
- CNC Tear out notch makes optional Spiro Locs removal easy.
Product Description
438 FE Ford, 1 FX 4032 Alloy, Comp Height: 1.335", -5cc Flat Top, PIN: .99", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.250", ROD: 6.7", , Appox Comp Ratio: 65cc-12.43, 72cc-11.51, 76cc-11.03 NOTE: Effective July 3, 2025, all FE Ford ring grooves have been updated to the new specifications of 1.2-1.2-3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1/16-1/16-3/16.
Specifications
- Pistons Series:
- FX Series
- Year:
- 1958 to 1976
- Make:
- Ford
- Engine:
- 390 FE
- Bore:
- 4.050 in.
- Stroke:
- 4.250 in.
- Rod Length:
- 6.700 in.
- Compression Height:
- 1.335 in.
- Crown Volume:
- -5.00 cc Flat Top
- Cylinder Head Volume to Calculate Compression Ratio:
- 72cc
- Compression Ratio:
- 11.89:1
- Pin Diameter:
- 0.990 in.
- Piston Material:
- Forged 4032 Alloy
- Ring Lands:
- 1.2, 1.2, 3mm
- Gas Porting:
- None
- Wrist Pin Fitment:
- Press Fit or Floating
- Rings Included:
- No
- Notes:
- Most FE‑series OEM connecting rods require narrowing at the pin end to achieve proper side clearance within the 2.5‑inch pin boss. Aftermarket rods are typically manufactured with a narrower profile and therefore do not require this modification. Effective July 7, 2025, all FE Ford ring grooves have been updated to the new specifications of 1.2-1.2-3mm.
- Quantity:
- Sold As Set (8/pkg)
