H-Plus Connecting Rod Set (H-Tuff Series with heavier beam for higher boost applications)Manley Sport Compact - Connecting Rods: Manley Performance manufactures the finest steel connecting rods in the Sport Compact industry. Our Pro Series "I" Beam is forged from 4340 aircraft quality vacuum degassed material. We utilize our proven "Turbo Tuff" design and add 3/8" ARP 2000 cap screws. All rods are properly shot peened after machining and 100% magnafluxed.Manley "H" Beam connecting rods are manufactured from 4340 forgings to the same exacting standards developed and approved by our original equipment customers. There is a vast difference in quality between a Manley "H" Beam and the "other" inexpensive H-Beams on the market. Weight matched to +/- 1.5 grams. Perfectly round big and small ends. Bend and twist is tightly controlled.