Description
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.
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