1/2 Stud - 6.600 Long Broached w/1.250 Thread

The ARP 1/2 stud—6.600 long broached with 1.250 thread—is a precision fastening component designed for high-performance engine builds where critical clamping force and repeatability are essential. This stud is ideal for technicians and builders focused on assembling cylinder heads for both street engines and dedicated race platforms.

Constructed from premium alloy steel, this stud is engineered to maintain preload under thermal cycling and combustion pressure spikes, outperforming conventional fasteners. The broached design ensures a consistent and repeatable clamping interface, which resists loosening and maintains gasket compression across numerous heat cycles.

Engine builders, turbocharged platform owners, and serious automotive enthusiasts will find significant benefits in upgrading to ARP cylinder head studs for any high-mileage overhaul or power increase. This stud is particularly suited for deep-deck or tall-block configurations, providing secure nut retention and reliable performance.