Manley Performance manufactures the finest steel connecting rods in the Sport Compact industry. Manley Pro Series connecting rods are forged from aircraft quality 4340 vacuum degassed material. Each rod is fully machined in the Manley Lakewood, NJ factory to the highest standards. Our signature “Turbo Tuff” design combines the appropriate weight and rugged strength for ultimate horsepower applications. Bores are round and without taper. Bend and twist is tightly controlled. Cap fasteners are upgraded 3/8″ APR AGE625+ alloy bolts. All rods are properly shot peened after machining and 100% magnafluxed. Manley “I” Beam – Turbo Tuff* Manley Pro Series Turbo Tuff connecting rods are used by the best tuners in and outside of the United States in some of the fastest, high horsepower, heart stopping engines being produced. All Manley connecting rod sets, are weight matched to ± 1.5 grams, big and small end bores are final honed to a tolerance of ± .0002″, critical bend and twist attributes are held to a minimum, and exacting attention is paid to every detail by our final inspection department; thus rendering a finished product that is second to none. Recommended for applications above 700HP or those that simply want the finest rod on the market for their engine.