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the 550 GT-A bridges the gap between factory drivability and serious performance
parabolic billet guide
Atomic Steel Main Girdle – EF–AU Ford SOHC 6-Cyl | 10mm Thick | Bottom-End Strength Upgrade
✔️ Proven hydraulic design that adjusts to chain tension dynamically
Atomic Barra Tool Steel Main Stud Kit Block Type:BA/BF the 550 GT-A bridges theAtomic Tool Steel Main Stud Kit Ford Barra DOHC H13 Tool Steel Complete Bottom End Fastening Solution Description: When you're building a high horsepower Barra, the bottom end needs to be locked down permanently. The factory main bolts are not designed to handle the extreme cylinder pressure, torsional load, and high RPM seen in serious street and race applications. Enter the Atomic Tool Steel Main Stud Kit a premium fastener upgrade for FG onward