Gen III Hemi 8740 Chromoly Main Stud Kit

The ARP 244-5400 main stud kit is engineered for Gen III Hemi engines, providing enhanced reliability for performance applications. These studs are crucial for preventing main cap walk and fretting, thereby protecting the integrity of the engine block's threads. Constructed from high-strength 8740 chromoly steel, these studs are heat-treated to achieve a remarkable tensile strength of 200,000 psi. They feature precision J-form threads that are rolled after the heat treatment process to ensure superior durability and thread engagement. The kit includes studs with thread sizes M14x1.25 and M10x1.25. This main stud kit is designed to fit Chrysler 5.7L, 6.1L, 6.2L, and 6.4L Hemi engines, including those with cross bolts. It is compatible with both stock main caps and aftermarket main caps from HHP. While a specific year range is not explicitly detailed across all sources, some listings indicate compatibility for 2003-2024 model years for 5.7/6.1/6.2/6.4L HEMI engines. However, one source notes that fitment data may need manual verification for certain applications, such as the 2021-2023 Dodge Ram (6.2L) and 2009-2023 Dodge Charger. ARP's recommended installation method for their main stud kits involves fully installing the studs and then backing them out 1/8 to 1/4 of a turn to ensure proper thread engagement and accurate measurements, regardless of the specific application.