Forged 4.080" Flat Top Piston Set, 3.980" Stroke, 6.490" Rod 261496 SRP261496 1.670" Comp Height. Suit Ford FE 390 FORD FE 390 4.080" FLAT TOP Our race-proven SRP design is now available for the Big Block "FE" series. Available for both stock stroke and stroker applications. Bore sizes for the 428 block are set at .025" over to allow the use of popular file-fit rings. These pistons offer thick .250" top ring lands for use with limited nitrous or boost while still offering substantial weight savings. Wrist pin diameter is .975" for part numbers designed for 6.490” OEM rods and .990" for part numbers designed for aftermarket 6.700" rods

Includes:

Pin#: 975-2750-16-51S

Double Spiro Locks (#990-042-CS)

Specifications:

Engine: BIG BLOCK FORD FE

Bore Diameter: 4.080

Compression Height: 1.670

Compression Ratio with 68cc chamber volume: 11.4

Compression Ratio with 72cc chamber volume: 10.9

Compression Ratio with 76cc chamber volume: 10.5

Piston Volume: -5.0

CylinderHead: EDELBROCK 6005/06

Piston Pin Outside Diameter: 0.975

Piston Pin Length: 2.750

Piston Pin Material: 5115

Ringset Included: No

Top Compression Ring Thickness: 1/16"

Second Compression Ring Thickness: 1/16"

Oil Ring Thickness: 3/16"

Piston Material: 4032

Forging Type: FSR

Piston Avg Weight: 534

Pin Wall Thickness: 0.160

Piston Type: Flat

Ring Set: J100F8-4080-5