Description
S&S Cycle Big Bore Forged Piston Kit: 99-06 Harley-Davidson Big Twin Models - 3.937 - 920-0101
Fitment: 99-06 Harley-Davidson Big Twin models
These big bore pistons work with the stock 4" stroke flywheels to convert any 99-06 Harley-Davidson big twin engine from 88" to 98" displacement with 10.3:1 compression with stock heads. Stock cylinders may be bored to accomodate larger pistons, but they 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. 3.937" standard bore.
Features:
- Significantly increase performance
- Provides more horsepower without sacrificing torque
- 10.6:1 compression ratio
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
