King Bearing MB 544AM for BMW M10B15/18/20
A premium grade 8740 alloy chrome moly steel is used to manufacture ARP High Performance connecting rod bolts. This material is heat-treated to provide a tensile strength in the 200,000 psi range, which is substantially stronger than the OEM bolts.
It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, there's not a better stud setup on the market today.
BMW M10 S14 4-cylinder, 2 bolt main, ARP Main Studs 201-5001ARP BMW Main Stud Kits, There are many important reasons to use ARP Main Stud Kits, for Audi's including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block.