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Engines and Components› Cylinder Heads and Components

Speed Performance

Speed Perf6RMANC3 Custom Age Head Stud Kit

$500.00 $499.99 Save $0.01

SKU: SP63-625-10

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Overview

The SPEED PERF6RMANC3 Custom Age 625+ Head Stud Kit is a premium engine component designed for enhanced performance and durability. These head studs feature an even higher Ultimate Tensile Strength (UTS) compared to previous L19 offerings, bringing them closer to the 280 ksi material limit. They also offer improved corrosion resistance.

The kit includes upgraded, heat-treated nuts for a lower failure rate when paired with heat-treated studs, as well as washers and a special assembly lube. This lube is tested to provide the most accurate torque specification available on the market.
Show original supplier description
Introducing the Custom Age 625+ head studs from SPEED PERF6RMANC3, engineered to provide superior clamping force and reliability for high-performance engines. These studs boast an exceptional UTS, approaching the 280 ksi limit of the material, and offer enhanced corrosion resistance over previous generations. Each 10mm head stud kit is supplied with new washers and a specialized assembly lube, rigorously tested to ensure the most accurate torque application possible. This proprietary lube is exclusively available through SPEED PERF6RMANC3. A unique dog point feature on the stud accurately positions it within the block, preloading the fastener for precise and consistent torque application. This design prevents compromise to the block during tightening and ensures even distribution across the threads, alleviating stress on the initial thread under load. These head studs are specifically designed for the Ecoboost 2.0L/2.3L engines found in the Ford Focus ST, RS, and Mustang, as well as Mazda MZR-DISI 2.3L engines in the Mazdaspeed3/6. Modification to the cylinder block will be necessary for installation on a Fiesta ST 1.6L. The product includes a Limited Lifetime Warranty.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandSpeed Performance
Part NumberSP63-625-10
CategoryEngines and Components
5,000+ Trusted brands
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(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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