S/S Thermostat Hsg. Bolt Kit - 12pt. LS1/LS2

The ARP Stainless Steel Thermostat Housing Bolt Kit for GM LS1/LS2 engines delivers premium fastening solutions engineered for high-performance and stock engine builds alike. This stainless steel thermostat housing bolt kit features 12-point heads and polished finish, providing both corrosion resistance and clean aesthetics under the hood. ARP's 434-7401 kit consists of a matched pair of 6mm x 1.0 male thread fasteners, each 20mm in length, designed to secure the thermostat housing on LS-series engine platforms with precision and reliability.

The 12-point head design allows use with both 12-point and standard hex sockets, offering versatility during installation and service intervals. Stainless steel construction resists corrosion in harsh environments, including salt-air exposure and high-moisture climates—a critical advantage over standard steel fasteners in long-term engine durability. The polished surface finish not only enhances visual appeal but also aids in inspection, making it easier to spot wear or damage during routine maintenance. These fasteners meet the demands of both street and competition engine applications where reliability and corrosion resistance are non-negotiable.

This kit is engineered for LS1 and LS2 platform users—from street performance enthusiasts to engine builders prioritizing long-term dependability. The stainless steel thermostat housing bolt kit replaces OEM fasteners with superior material and finish, extending service life and reducing maintenance intervals in demanding conditions. Whether assembling a new LS combination or upgrading an existing engine, this bolt pair ensures secure fastening of critical cooling system components without risk of corrosion-induced failure.