Keith Black piston set is .030 oversize and is for a 3.875" bore. Piston set has a compression ratio of 9.3:1 and includes rings.

VT No: 11-2278
Keith Black piston set is .030 oversize and is for a 3.875" bore. Piston set has a compression ratio of 9.3:1 and includes rings.
The Keith Black 390 hypereutectic alooy is cast in a permanent steel mold which makes it possible to build a light weight piston that makes more power and uses less fuel and lasts longer. Pistons are .030 oversize, for a 3.875" bore and has a 9.3:1 compression ratio. The low heat transfer of the alloy keeps the skirts cool so piston expansion is minimal. The combination of a low heat transfer piston alloy and high compression ring placement increases power and economy. The high ring placement alone reduces detoantion and increases the top ring temperature. **Note:Run engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears, in order to properly break-in new pistons and rings.
Fits:
FXST 2007-2017
FLST 2007-2017
FXD 2007-2017
FLT 2007-2016
UOM: 2 - SET
Country of Origin: Imported

Manufacturer: Keith Black
2018 Catalog pages: 183

2017 Catalog Page: 183

V-Twin Manufacturing Part Number: 11-2278
Manufacturer: Keith Black
Manufacturer Part Number: KB348 .030

Harley-Davidson & Indian OEM Cross Reference Part Numbers:            

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