S&S 3.937″ Big Bore Bolt-In Piston Set (920-0100)

Description

• This is the largest bore (3.937″) that can be fit in a stock engine case
• Stock engine height is maintained so there are no manifold or frame fitment issues
• The S&S 11 fin cylinder design closely resembles OEM shape and come prefinished – ready to install
• Cylinders feature increased fin area for better heat dissipation, and the centrifugal cast, gray iron liner features 40,000 psi tensile strength for superior wear and performance
• The pistons in this kit have a 3cc pop-up dome for slightly higher compression ratio
• For 107″ twin cam motors
• Pistons are compatible with stock rods with tapered wristpin ends
• Stock cylinders may be bored to accommodate larger piston
• Bore cylinders to nominal diameter +/- 0.0005″ for correct clearance