Forged 4340 Steel. ARP 2000 Bolts. With Standard Original ARP 2000 Bolts. Upgradable ARP L19 Bolts. for Ford Kent Crossflow 4.928". Bolts Including ARP 2000 bolts. Bolts Size ARP 2000 3/8" bolts. Conrod Connecting Rods ARP 2000 for Lotus twin cam 1600 Lotus TC Ford X-flow.