The threads are rolled after heat-treating which gives them about 2,000 percent better fatigue strength than most main bolts that are threaded prior to heat-treating. Hardened parallel-ground washers are included with each kit.
ARP Crankshaft Main Cap Bolt 155-5201; Hex Head Chromoly for Ford 390-428 FE
ARP 134-5202 Main Cap Fasteners 4-Bolt Main SBC 350, 400 Hex
ARP 135-5402 Main Cap Fasteners - 2-Bolt Main Big Block Chevy 396 402 437 454
ARP 134-5601 Main Cap Fasteners - 4-Bolt Main Small Block Chevy 302 327 350 400
ARP 135-5002 Main Cap Fasteners-2-Bolt Main BBC 396, 402, 427, 454 Hex
ARP 134-5401 Main Cap Fasteners - 2-Bolt Main Small Block Chevy 327 350 400 Hex
