Sifton piston set is standard size for a 3-5/8" Big Bore. Has a 9.75:1 compression, 3-5/8" bore with a 4-5/8" stroke.
**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.
FLT Tour Glide® 1984-1998
FXST Softail® 1984-1998
FXR Super Glide® 1984-1994
FLST Heritage Softail® 1986-1998
FXD Dyna Glide® 1991-1998
Suggested to use with #11-0859 ring and #12-0949 keepers