Honda/Acura Head Stud Kit - K20A

The ARP Honda/Acura Head Stud Kit for K20A engines delivers the clamping force and reliability required for high-performance cylinder head assembly. Designed as a direct replacement for factory head bolts, this chromoly stud kit uses ARP's proven 12-point nut design to ensure consistent, repeatable torque without fastener slippage during engine operation. The undercut design maximizes load capacity while the black oxide finish resists corrosion in engine bay environments.

Head studs outperform factory bolts by maintaining clamp load stability across thermal and mechanical stress cycles. The K20A, a 2.0-liter four-cylinder found in Honda Civic Si and Acura models, benefits significantly from this upgrade, particularly in boost or high-RPM applications where cylinder pressure peaks exceed original specifications. Chromoly material provides superior yield strength compared to standard steel bolts, reducing the risk of stretch or permanent deformation. The 12-point nuts distribute load more evenly than 6-point alternatives, reducing stress concentration and extending fastener life.

This kit addresses a critical need for engine builders, tuners, and enthusiasts rebuilding K20A heads for turbocharged, supercharged, or naturally aspirated performance builds. Factory bolts often cannot safely handle the cylinder pressures generated by modified intake and fuel systems. ARP studs are installed with precision torque specs and stretch measurement protocols, eliminating the guesswork of bolt preload. The complete kit ensures all fasteners meet identical specifications, eliminating weak points in the assembly.

Head studs are an industry standard in professional engine machining and are typically specified by machine shops performing head work on performance vehicles. For K20A owners pursuing reliability during power increases, this upgrade represents a foundational safety improvement that protects against gasket failure and head separation.