![Load image into Gallery viewer, K2-2457-4125 420 Small Block Chevy K2-FX Series +4cc Dome Top Forged Piston Set. 4.125 bore](http://dssracing.com/cdn/shop/products/SBCFX-MHCHR_6e2d29d6-4442-4c0c-98af-1134949fc67e_400x@2x.jpg?v=1672355453)
![Load image into Gallery viewer, DISCONTINUED USE K2-2458-4125 420 Small Block Chevy K2-FX Series +4cc Dome Top Forged Piston Set. 4.125 bore](http://dssracing.com/cdn/shop/products/FX2_fdc16ff1-d2fe-4f2c-81ce-8d7bbe21db82_400x@2x.jpg?v=1678078329)
![Load image into Gallery viewer, DISCONTINUED USE K2-2458-4125 420 Small Block Chevy K2-FX Series +4cc Dome Top Forged Piston Set. 4.125 bore](http://dssracing.com/cdn/shop/products/kbox_d10f8dba-d7a2-4be4-9376-df992f5abc87_400x@2x.jpg?v=1678078329)
Engine Brand: Chevy
Engine Family: Small Block Chevy
Engine Size: 420
With/Without Rings: Includes Rings
Cylinder Bore Size: 4.125 in - 104.7 mm
Ring Width: 1.2/1.2/3MM
Compression Height: 1.362"
Pin Diameter: .927
Connecting Rod Length: 5.700"
Crankshaft Stroke: 3.875"
Piston Series: 2-FX Series
Alloy: Forged 2618
Cylinder Head: SBC 23 Degree
TDC Assembly Height: 9.000
Piston Top Aprox. Comp. Ratio:
Chamber | Comp. Ratio |
---|---|
58cc | 14.51 to 1 |
64cc | 13.33 to 1 |
70cc | 12.34 to 1 |
Engine Brand: Chevy
Engine Family: Small Block Chevy
Engine Size: 420
With/Without Rings: Includes Rings
Cylinder Bore Size: 4.125 in - 104.7 mm
Ring Width: 1.2/1.2/3MM
Compression Height: 1.362"
Pin Diameter: .927
Connecting Rod Length: 5.700"
Crankshaft Stroke: 3.875"
Piston Series: 2-FX Series
Alloy: Forged 2618
Cylinder Head: SBC 23 Degree
TDC Assembly Height: 9.000
Piston Top Aprox. Comp. Ratio:
Chamber | Comp. Ratio |
---|---|
58cc | 14.51 to 1 |
64cc | 13.33 to 1 |
70cc | 12.34 to 1 |
The DSS FX, X-Groove Feature
![](http://dssracing.com/cdn/shop/files/Screen_Shot_2023-02-02_at_12.58.44_PM_1780x_e2888a05-9892-4c89-88c1-e71433dd4633_750x.gif?v=1680360352)