Main Stud Kit for NA/NB Mazda Miata by ARP | 218-5401

Replaces crankshaft main cap bolts with high strength studs/nut configuration.

There are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your
engine block. All kits come complete with hardened parallel-ground washers and high quality nuts. Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place. The studs are manufactured from 8740 chrome moly steel, heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others.

Part Number: 218-5401

This Part Fits: 1989-2005 NA6 NA8 NB1 NB2 NBMSM Mazda Miata's