K1 forged connecting rods and crankshafts are crafted from premium 4340 steel, ensuring exceptional strength and durability. Designed and manufactured in the USA, each connecting rod is finished and inspected to meet the rigorous demands of racing and rally applications.

Manufacturing tolerances are held to an impressive +/-0.0001" on bearing bores, delivering precise fitment and performance. Only genuine ARP bolts are used—ARP 2000 as standard, with 625+ upgrades available for select applications. Bronze bushings minimize friction and extend service life, while select rod sizes offer press-fit pins.

K1 crankshafts feature hardened cores for increased tensile strength, with bearing surfaces polished and nitrided for superior wear resistance. ARP bolts are installed and torqued to exact specifications before honing, ensuring consistent and accurate bore geometry. Connecting rods are weight-matched in sets, with rotary, reciprocating, and total weights clearly marked to simplify engine balancing.

Product available for order.