ARP 144-4004 Pro Series Cylinder Head Stud Kit Small Block Chrysler 318 340 360

The ARP 144-4004 Pro Series head stud kit is engineered for small block Chrysler 318, 340, and 360 engines equipped with B1 or BS aftermarket cylinder heads. This professional-grade fastener kit delivers the superior strength and reliability demanded by high-performance and competition engine builds.

Premium 8740 Chrome Moly Construction

Each stud is manufactured from premium 8740 chrome moly steel alloy, providing tensile strength rated at 190,000-200,000 psi—far exceeding standard grade 8 fasteners. The studs are cold-forged to ensure complete molecular integrity, then vertically rack heat-treated for uniform heat penetration throughout the material. This meticulous process produces fasteners with exceptional strength characteristics that inferior basket-tumbled studs simply cannot match.

Precision Manufacturing Process

Following heat treatment, each stud undergoes centerless grinding to achieve near-perfect concentricity. This precision machining involves multiple fine cuts that result in exceptionally straight studs, allowing cylinder heads and gaskets to align perfectly during assembly. The threads are rolled after heat treatment rather than before—a more expensive process that delivers approximately 20 times better fatigue strength than pre-threaded studs.

Complete Kit Contents

• Hex head studs with black oxide finish for corrosion resistance
• Hex nuts for proper torque application
• Hardened parallel-ground washers for even load distribution and accurate torque readings
• All components needed for complete cylinder head installation

Performance Advantages

Head studs offer significant benefits over conventional head bolts for performance applications. Unlike bolts that twist under torque load, studs stretch only along the vertical axis when the nut is tightened, providing more consistent and accurate clamping force. The relaxed installation of studs (finger-tight into the block) followed by nut torquing eliminates the dual loading forces that affect bolts, resulting in more reliable head gasket sealing and reduced risk of gasket failure.

This kit is specifically designed for small block Chrysler wedge engines (273-360 cubic inch) running B1 or BS series aftermarket cylinder heads. Each stud is stamped with the ARP logo as assurance of authenticity and quality. Trusted by professional engine builders across all forms of motorsports, ARP Pro Series fasteners represent the gold standard in cylinder head hardware.