B58 ARP 625+ Custom Age Main Stud Kit

Toyota BMW B58 625+ Custom Age Main Stud Kit When we started developing our B58 Billet Main Cap system, we needed a main stud strong enough to handle the extreme loads of high-horsepower B58 builds. Working with ARP, we developed a 625+ Custom Age Main Stud Kit to provide the increased strength and clamping force needed for serious B58 performance applications. Manufactured from ARP 625+ Custom Age material, these high-strength main studs provide exceptional tensile strength, fatigue resistance, and consistent clamping force for extreme-power applications. This ARP Main Stud Kit is designed to replace BMW part numbers 11128644674 and 11127613127 for B58, B58A, B58C, and B58D engines found across various BMW chassis, including F22, F23, F30, F31, F32, F33, F34, F36, G20, G22, G23, G26, G30, G01, G02, G29, G42, and G43, as well as the Toyota GR Supra A90/A91. Features & Benefits ARP 625+ Custom Age material Increased strength and fatigue resistance More consistent main-cap clamping Helps minimize main-cap movement under extreme loads Improved crankshaft and main-bearing stability Ideal for high-RPM and high-horsepower B58 builds Direct replacement for OEM bolt part #11128644674 and #11127613127 Works with OEM B58 engine blocks and factory main caps Designed for use with 5150 AutoSport B58 Billet Main Caps When opting for main studs instead of factory bolts, it's important to note that the engine builder should mic the bores. Using studs may require a line hone to ensure proper fitment and alignment. A line hone is a machining process that can be used to resize and reshape the main bearing bores, ensuring that they are perfectly round and concentric. This is crucial for ensuring proper oil clearance and preventing premature bearing wear. By mic'ing the bores and performing a line hone if necessary, engine builders can ensure that the main studs are installed correctly and that the engine will perform reliably and at its best. Installation Instructions Thoroughly clean all threaded holes in the engine block. If necessary, use an ARP thread chaser to ensure clean threads and proper engagement. Inspect all studs, nuts, and washers for damage and verify proper fit, length, and dimensions before installation. Install the main studs into the engine block by hand until snug. Do not overtighten. Install the main caps and check for proper fit, alignment, and any binding. Apply ARP Ultra-Torque Fastener Assembly Lubricant to the stud threads, nuts, washers, and washer contact surfaces. Install the washers and nuts and tighten them by hand. Do not substitute motor oil or other lubricants for ARP Ultra-Torque. Following the manufacturer's recommended main-cap tightening sequence, torque all main stud nuts progressively in three steps using ARP Ultra-Torque: Step 1: 25 ft-lbs Step 2: 50 ft-lbs Step 3: 75 ft-lbs After final torque, measure the main bearing bores and verify proper size, roundness, and alignment. If necessary, line hone the main bores with the ARP main studs installed and torqued to specification. Verify final main bearing oil clearances before engine assembly. Fitment BMW 2 Series F22 / F23 M240i F22 / F23 M240i xDrive G42 / G43 M240i xDrive BMW 3 Series F30 / F31 / F34 340i F30 / F31 / F34 340i xDrive G20 M340i G20 M340i xDrive BMW 4 Series F32 / F33 / F36 440i F32 / F33 / F36 440i xDrive G22 / G23 M440i G22 / G23 M440i xDrive G26 M440i xDrive Gran Coupe BMW 5 Series G30 540i — B58A (2017–2019) G30 540i — B58C (2020+) G30 540i xDrive — B58A (2017–2019) G30 540i xDrive — B58C (2020+) BMW X3 G01 X3 M40i BMW X4 G02 X4 M40i BMW Z4 G29 Z4 M40i Toyota GR Supra A90 / A91 GR Supra