Head Bolt Kit - 12pt Toyota 1.3L/1.5Y 4-Cyl.

The Head Bolt Kit - 12pt Toyota 1.3L/1.5Y 4-Cyl. by ARP is engineered for enthusiasts and mechanics who demand reliability under high-rpm and high-boost conditions. Toyota's 1.3-liter and 1.5-liter four-cylinder engines are common platforms for tuning and forced induction builds, where factory fasteners reach their limits. ARP's premium head bolt kits replace OEM hardware with superior materials and design, ensuring consistent clamp load and eliminating the risk of bolt stretch or head gasket failure during aggressive driving or engine modifications.

This kit features 12-point fasteners, which provide superior engagement compared to standard six-point designs and reduce the chance of rounding during installation or removal. ARP fasteners are manufactured from high-strength alloy steel, heat-treated to precise specifications, and offer significantly higher tensile strength than factory bolts. The 12-point geometry also allows for more precise torque-angle specifications, critical when establishing proper clamping force on aluminum cylinder heads. Each bolt is individually packaged and supplied with ARP's proprietary lubricant to ensure repeatable torque values and consistent preload across all fastening points on your engine block.

This head bolt kit is ideal for any Toyota 1.3L or 1.5Y engine owner planning a rebuild, head gasket replacement, or performance upgrade involving increased boost or compression. Installation requires following ARP's torque-angle procedure—typically available in their documentation—to achieve proper stretch and load distribution. Compatibility is specific to these displacement engines, making it essential to verify your exact engine code before purchase. For turbo builds, supercharger installations, or high-revving naturally aspirated configurations, upgrading to ARP fasteners is a fundamental investment that protects both head gasket integrity and overall engine longevity.