![Load image into Gallery viewer, K1-2457-4185 420 Small Block Chevy K1-FX Series +4cc Dome Top Forged Piston Set. 4.185 bore](http://dssracing.com/cdn/shop/products/SBCFX-MHCHR_e0347a15-5f3a-4a32-a9d9-6cea673a2fda_400x@2x.jpg?v=1672101471)
![Load image into Gallery viewer, DISCONTINUED USE K1-2458-4185 420 Small Block Chevy K1-FX Series +4cc Dome Top Forged Piston Set. 4.185 bore](http://dssracing.com/cdn/shop/products/FX1_49d22812-de5d-47cf-a437-a7b2be028241_400x@2x.jpg?v=1678074796)
![Load image into Gallery viewer, DISCONTINUED USE K1-2458-4185 420 Small Block Chevy K1-FX Series +4cc Dome Top Forged Piston Set. 4.185 bore](http://dssracing.com/cdn/shop/products/kbox_79bc3ff3-dc00-4619-95f7-4146a3f92df1_400x@2x.jpg?v=1678074796)
Engine Brand: Chevy
Engine Family: Small Block Chevy
Engine Size: 420
With/Without Rings: Includes Rings
Cylinder Bore Size: 4.185 in - 106.22 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: 1-FX Series
Alloy: Forged 4032
Cylinder Head: SBC 23 Degree
TDC Assembly Height: 9.000
Piston Top Aprox. Comp. Ratio:
Chamber | Comp. Ratio |
---|---|
58cc | 14.85 to 1 |
64cc | 13.64 to 1 |
70cc | 12.63 to 1 |
Engine Brand: Chevy
Engine Family: Small Block Chevy
Engine Size: 420
With/Without Rings: Includes Rings
Cylinder Bore Size: 4.185 in - 106.22 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: 1-FX Series
Alloy: Forged 4032
Cylinder Head: SBC 23 Degree
TDC Assembly Height: 9.000
Piston Top Aprox. Comp. Ratio:
Chamber | Comp. Ratio |
---|---|
58cc | 14.85 to 1 |
64cc | 13.64 to 1 |
70cc | 12.63 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)