VT#: 11-2254

The Kieth Black 390 hypereutectic 3.5" bore piston set has a 8.3:1 compression ratio and is oversize .020. Piston set alloy is cast in a permanent steel molded and includes rings .
**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.

FL Electra Glide® 1978-1984
FX Super Glide® 1978-1984
FLT Tour Glide® 1979-1983
FXR Super Glide® 1982-1983