• Manufactured from 4340 forgings
• Heat treated, stress relieved, shot peened and 100% individually magnafluxed
• Weight matched sets " 1.5 grams
• Cap fasteners are 3/8" ARP 2000 for the H-Tuff and 3/8" ARP Custom Age 625" for the H-Tuff Plus
• Flywheel horsepower range for the these rods in a 4 cylinder application is 750 with the ARP 2000 bolts and 950 with ARP 625" bolts.
• Bridges the gap between our standard, proven H-Beams and top of the line, best of the best Turbo Tuff� Series rods
• H-Tuff delivers a stronger rod with greater safety margin to handle elevated boost and higher power levels for a modest price premium over standard H-Beams
• H-Tuff design incorporates wider beam and increased cross-sectional thickness in critical areas

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. Each rod is shot peened after machining and magnafluxed. Bores are round and without taper. Bend and twist is tightly controlled. Cap fasteners are 3/8" APR 2000 cap screws.

These rods are also available with ARP 625" fasteners. To order, affix an "R6" to the part number.