S&S 106-3690 Cycle 07-17 BT 3.927in Standard Bore 106in Big Bore Forged Piston S

S&S 106-3690 Cycle 07-17 BT 3.927in Standard Bore 106in Big Bore Forged Piston Set

Brand: S&S Cycle

MPN: 106-3690

Product Department: Engine Components

Product Category: Piston Sets - Powersports

Box Quantity: 1

Weight: 2.7 lbs

Height: 4.75 Inches

Width: 4.75 Inches

Length: 8.63 Inches

CARB Status: Yes

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" standard bore.