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Upgrade your Mitsubishi 4G63 engine with the unmatched strength and precision of ARP's Pro Series head bolt kit. These bolts are cold-forged from premium 8740 chromoly steel to ensure structural integrity and are heat-treated for maximum tensile strength up to 190,000 psi. Each bolt features a 12-point head for optimal torque application, making them ideal for high-performance builds, including turbocharged and track applications.
Engineered for demanding performance, this ARP head bolt kit provides even clamping force across the cylinder head, thanks to hardened parallel washers that ensure consistent load distribution. Whether you're building a street monster or a race-ready Evolution or Eclipse, ARP delivers the reliability, durability, and performance you can trust—backed by a lifetime warranty.
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