This ARP Main Stud Kit is designed to replace BMW 11111735525 for the S14 B20, S14B23, S14B25, S14B27 engines found in the E30 M3. One significant advantage of these main studs is their ability to prevent main cap walk, which can occur when the main caps shift or move out of position, potentially causing damage to the engine. In addition, ARP Main Studs can safeguard the threads of your engine block, providing an extra layer of protection against potential damage. 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: 20 ft-lbsStep 2: 40 ft-lbsStep 3: 60 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. BMW S14 Applications: BMW S14B20 1989-1991 E30 320is [Portugal and Italy] BMW S14B23 1986-1991 E30 M31986-1987 E30 M3 Evo I1988 E30 M3 Evo II BMW S14B25 1990 E30 M3 Sport Evo (Evo III)
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