S&S Cycle 2007+ BT 3.927in +.010in Bore 106in Big Bore Forged Pistons

S&S Cycle 2007+ BT 3.927in +.010in Bore 106in Big Bore Forged PistonsThese big bore pistons work with the stock 4 3 8" stroke flywheels to convert any 2007 '16 HD big twin engine from 96" or 103" to 106" displacement with 10: 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

These big bore pistons work with the stock 4-3/8" stroke flywheels to convert any 2007-'16 HD® big twin engine from 96" or 103" to 106" displacement with 10:1 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" .010" bore.