Bolt Kit - 12pt. (5) 7/16-14 x 2.750

The Bolt Kit - 12pt. (5) 7/16-14 x 2.750 from ARP represents the premium fastening solution serious engine builders and performance mechanics demand when assembling or rebuilding high-output powerplants. These bolts are engineered for applications where standard hardware simply won't cut it—critical joints like cylinder head fastening, intake manifold clamping, and other load-bearing engine assemblies that experience extreme combustion pressures and thermal cycling. Whether you're freshening a stock long-block or assembling a stroker package, this five-bolt kit delivers the reliability that separates a weekend build from a track-ready engine.

ARP's proprietary 8740 chromoly steel and specialized heat-treatment process delivers superior tensile strength and fatigue resistance compared to conventional SAE Grade 8 fasteners. The 12-point head design distributes load more evenly across the bolt head, reducing the risk of stripping while providing more contact points for precision torquing to exact specifications. At 7/16-inch diameter with 14-threads-per-inch pitch and a 2.750-inch length, these bolts accommodate medium-block configurations and common manifold mounting patterns found across both domestic and import performance applications. The aggressive threading and premium finish ensure repeatable clamping force and elimination of fastener relaxation under sustained high-RPM or boost conditions.

Professional engine builders, hot rod fabricators, and dedicated enthusiasts rely on ARP fasteners to eliminate a single point of failure in meticulously planned builds. This kit's five-bolt configuration suits multi-step assembly sequences, allowing you to stage critical joints or address legacy casting patterns that demand non-standard hardware arrangements. Always consult your engine manual or technical build guide to confirm thread pitch and length compatibility with your specific block and head combination, then apply ARP's recommended torque values with a calibrated wrench for optimal clamping load and structural integrity.