SBC 12pt Short W/P Bolt Kit

The ARP 134-3203 SBC 12pt Short W/P Bolt Kit is a purpose-built chromoly water pump bolt set engineered for small block Chevy engines. This is OEM-grade hardware designed to handle the thermal cycling and pressure loads encountered in high-performance and marine applications where factory fasteners fall short. The 12-point head design delivers superior contact geometry compared to traditional 6-point fasteners, reducing rounding risk during installation and removal—a practical advantage when working in tight engine bay configurations or field conditions.

Manufactured from chromoly steel and finished in black oxide, these bolts provide corrosion resistance essential for marine environments, saltwater exposure, and vehicles subject to wash-down. The black oxide coating offers modest protection against rust while maintaining precise dimensions for proper water pump mounting geometry. At 0.42 lbs for the complete kit, this is a lightweight yet critical fastening system—proper torque specification and thread engagement are non-negotiable for preventing coolant leaks and pump failure.

This kit serves builders, restoration specialists, and performance enthusiasts working on small block Chevy platforms across street, marine, and competition applications. Whether you're refreshing an engine with quality fasteners or replacing stripped bolts from a failed pump, the ARP 134-3203 delivers the material specification and engineering required for lasting reliability. These bolts are particularly valued in freshwater and saltwater marine builds where standard hardware deteriorates rapidly, and in turbocharged or supercharged engines where thermal stress demands superior fastening integrity.