Keith Black 390 hypereutectic piston set is .050 oversize and is for 3.438" bore. Pistons have a compression of 9.0:1.

VT No: 11-2206
Keith Black 390 hypereutectic piston set is .050 oversize and is for 3.438" bore. Pistons have a compression of 9.0:1.
**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:
FL 1941-1977
FX 1971-1977
UOM: 2 - SET
Country of Origin: Imported

Size: .050
Manufacturer: Keith Black
2018 Catalog pages: 531

2017 Catalog Page: 535

V-Twin Manufacturing Part Number: 11-2206
Manufacturer: Keith Black
Manufacturer Part Number: KB263 .050

Harley-Davidson & Indian OEM Cross Reference Part Numbers:            

Replacement Items:
11-1373 - 74" Moly Piston Ring Set .050 Oversize

Detailed Instructions: CLICK HERE!