K1 forged connecting rods and crankshafts are crafted from premium 4340 steel, ensuring exceptional strength and durability. Designed and manufactured with precision, K1 products meet the stringent requirements of motorsport applications, with bearing bore tolerances maintained to within +/-.0001".

All connecting rods utilize ARP bolts—ARP 2000 as standard, with optional 625 plus upgrades. Bronze bushings are used to minimize friction and extend service life. Select rod sizes offer press-fit pins. Each connecting rod is 100% designed, finished, and inspected in the USA.

K1 crankshafts feature hardened cores for increased tensile strength, with bearing surfaces polished and nitrided for enhanced wear resistance. ARP bolts are installed and torqued to exact specifications prior to honing, ensuring precise and repeatable bore geometry. All connecting rods are honed at the manufacturer's facility, weight-matched in sets, and clearly marked with rotary, reciprocating, and total weights to aid in balancing.

Product available for order.