These ARP main studs are designed to hold down the main bearing caps which secure the crankshaft in your engine block. The ARP main studs dramatically reduce the main cap walking and fretting. These ARP main stud kits are designed to keep the crankshaft securely locked in place within your motor. Using the proper fasteners to complete this job will help ensure a trouble-free life for your high performance engine. ARP manufactures these primary stud bolt kits with their proprietary 8740 Chromoly steel. This ARP main stud alloy has a 190,000 psi tensile strength rating. These main studs are precision centerless ground and thread rolled to Mil-S-8879 specs, with a black oxide finish for corrosion resistance. All of the ARP main studs kits come complete with hardened washers and high-strength hex nuts. The installation of these main stud kits is recommended if you are increasing the power level of your motor.
ARP MAIN STUDS VERSUS OEM BOLTS
The Main Stud is used for the installation of the Main Caps, The Main Caps hold your engine's crankshaft on the lower end of the motor.
The Head Stud is used for the installation of the Cylinder Head or Heads. The Head Stud holds the cylinder head in place on the engine block. The ARP Head Stud is what keeps the cylinder head in a constant state of tension to prevent head gasket failure. Heads studs work on the top of the motor.
ARP manufactures these Main Stud Kits in either a 2 Bolt or 4 Bolt Kits for each particular engine application.
Every single ARP product is MADE IN THE USA!