These big bore pistons work with the stock 4" stroke flywheels to convert any 1999-'06 HD® big twin engine from 88" to 97" displacement with 9.7:1 compression with stock heads. Stock cylinders may be bored to accomodate larger pistons, but we recommend S&S 3.927" bore cylinders which feature high strength alloyed cast iron liners. Pistons are compatible with stock rods with tapered wristpin ends. S&S® 3.927" bore pistons are machined to such close tolerances that it is not necessary to measure the piston. Just bore cylinders to nominal diameter +/- 0.0005" for correct clearance. Additionally, the low friction coating on the piston skirt makes taking measurements very difficult. 3.927" standard bore.
This Part Fits:
| Year |
Make |
Model |
Submodel |
| 1999-2006 |
Harley-Davidson |
FLHR Road King |
Base |
| 2004-2006 |
Harley-Davidson |
FLHRS Road King Custom |
Base |
| 1999-2006 |
Harley-Davidson |
FLHT Electra Glide Standard |
Base |
| 2003 |
Harley-Davidson |
FLHTC Electra Glide Classic |
Base |
| 2006 |
Harley-Davidson |
FLHX Street Glide |
Base |
| 2006 |
Harley-Davidson |
FLST Heritage Softail |
Base |
| 2000-2006 |
Harley-Davidson |
FLSTC Heritage Softail Classic |
Base |
| 2000-2006 |
Harley-Davidson |
FLSTF Fat Boy |
Base |
| 2005-2006 |
Harley-Davidson |
FLSTN Softail Deluxe |
Base |
| 2000-2003 |
Harley-Davidson |
FLSTS Heritage Springer |
Base |
| 1999-2002 |
Harley-Davidson |
FLTR Road Glide |
Base |
| 1999-2005 |
Harley-Davidson |
FXD Dyna Super Glide |
Base |
| 2005 |
Harley-Davidson |
FXDC Super Glide Custom |
Base |
| 1999-2005 |
Harley-Davidson |
FXDL Dyna Low Rider |
Base |
| 1999-2005 |
Harley-Davidson |
FXDWG Dyna Wide Glide |
Base |
| 2001 |
Harley-Davidson |
FXDWG2 CVO Dyna Wide Glide |
Base |
| 2002 |
Harley-Davidson |
FXDWG3 CVO Dyna Wide Glide |
Base |
| 1999-2005 |
Harley-Davidson |
FXDX Dyna Super Glide Sport |
Base |
| 2004-2005 |
Harley-Davidson |
FXDXI Dyna Super Glide Sport |
Base |
| 2001-2003 |
Harley-Davidson |
FXDXT Dyna Super Glide T-Sport |
Base |
| 2000-2006 |
Harley-Davidson |
FXST Softail Standard |
Base |
| 2000-2006 |
Harley-Davidson |
FXSTB Night Train |
Base |
| 2001-2006 |
Harley-Davidson |
FXSTBI Night Train |
Base |
| 2000-2006 |
Harley-Davidson |
FXSTD Softail Deuce |
Base |
| 2000-2006 |
Harley-Davidson |
FXSTS Springer Softail |
Base |
