Heavy Duty and Supreme Connecting Rods for 1936–'84 OHV Big Twins

For Stock Rebuilds And Almost Any Performance Upgrade. S&S Heavy Duty connecting rods are recommended for stock rebuilds and high performance street engines. The upper rod area where the rod beam meets the wristpin boss is blended together with a large, smooth radius that evenly distributes the stress load on the rod. The small ends of the rods are fully machined, which increases strength by maintaining a uniform material thickness around the wristpin. The machining process also keeps the difference between the small end weights of each rod to a minimum – allowing for the closest possible balancing job and a smoother running engine.

S&S Supreme rods are even stronger and are recommended for any extremely demanding application. The wristpin end of S&S Supreme rods are not fully machined.

Fits 1936-'84 big twins. Choose year application and heavy duty or supreme.

Features and Benefits

• Thicker I-beam sections for added strength
• Large radius from beam to wristpin boss for even stress distribution
• Fully machined wristpin end—uniform thickness and even reciprocating weight
• 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