Supreme Connecting Rod Set For 1957–'85 XL Models with Big Bore Wide Pin Boss

S&S Heavy Duty connecting rod sets for Harley-Davidson® Sportster® models are recommended for stock rebuilds and most performance street applications. They have stock wristpin width for use with stock bore pistons. S&S Supreme connecting rods are recommended for the most demanding applications including nitro engines. S&S Supreme rods have big twin width wristpin ends and are intended for engines with bore size larger than 3 5/16".

Features and Benefits

• Thicker I-beam sections for added strength
• Heavy Duty rods are forged from 4140 chromoly steel
• Supreme rods are forged from 4340 EQ, aircraft quality chromoly steel
• Heat treated to provide superior strength, hardness, and fatigue resistance
• S&S crankpins have two oil distribution holes located between the roller bearing paths for better oil distribution and continuous, unbroken support to the bearing
• Grooved thrust faces on crankpin end of rear rod help maintain lubrication between the rod and flywheel thrust face
• Rod-to-rod clearance accommodates strokes up to and including 5" stroke