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This is due to higher friction on the studs as well as inconsistencies in the clamping force of the fasteners when motor oil or other low quality lubricants are used
this BMW S14 2
1986-1987 E30 M3 Evo I
the head stud kit for a BMW S54 engine would be different from the one for a BMW M50 engine
B58 ARP Main Stud Kit 730i This is due to higherThis ARP Main Stud Kit is designed to replace BMW part numbers 11128644674 and 11127613127 for the B58; B58A, B58C, B58D engines found in varies BMW chassis F22, F23, G20, G22, G23, G26, G30, G01, G02, G29, G42, G43, F30, F31, F32, F33, F34, F36 and the Toyota GR Supra A90 A91 chassis. Upgrading from factory main bolts to ARP Main Studs is a simple, yet greatly beneficial upgrade. ARP Main Studs offer the following benefits: Uniform Clamping Force:
US$ 99.99
US$ 75.60
US$ 18.99
US$ 10.99
