Callies Ford 7.3L Godzilla Main Cap Kit

High-horsepower builds on the 7.3L Godzilla push the factory main cap architecture well beyond its design limits. Callies addresses that weak point directly with a billet main cap kit engineered to hold the bottom end together under serious boost, nitrous, or forced-induction power levels on the modified big block.

Billet construction where the factory casting falls short. The factory iron main caps were sized for stock power output. Callies machines these replacement caps from billet steel, dramatically increasing clamping rigidity and resistance to cap walk under high cylinder pressure. The result is a bottom end that stays in alignment when power levels climb.

Scalable kit options for every build level. This kit is offered in three configurations so builders can match hardware to their specific goals: the Main Cap Kit alone, a Main Cap and Main Stud Kit, or the full Main Cap, Main Stud, and Head Stud Kit. Each step up adds critical fastener upgrades that complement the billet caps and keep every critical joint properly clamped across the entire power stroke.

Precision fitment on the Godzilla block. Callies engineers these caps specifically for the 7.3L Godzilla architecture, so they index and torque into position without block machining surprises. Proper fitment at the main saddle is critical for bearing longevity, crank stability, and consistent oil film across the full RPM range.

Product Benefits

• Billet Steel Construction: Superior strength and rigidity compared to factory cast iron main caps.
• Resists Cap Walk: Maintains main saddle alignment under high cylinder pressure and peak torque loads.
• Three Kit Options: Available as caps only, caps with main studs, or a complete caps, main stud, and head stud package.
• Godzilla-Specific Design: Engineered to fit the 7.3L block without custom machining.
• Supports High-Power Builds: Suited for boosted, nitrous, or otherwise modified 7.3L applications pushing beyond stock power levels.
• Critical Foundation Upgrade: Stabilizes the crankshaft and protects bearings during aggressive use.
• Painless Service: Unique pry slot design allows easy removal of these caps with just a pair of screwdrivers.

Note: Fits 7.3L Godzilla engine from the 2020-2026 Ford F-250 and F-350 Super Duty. Verify dimensions are compatible with your build before ordering.

About Callies: Callies Performance Products specializes in high-performance rotating assembly components, including crankshafts, connecting rods, and bottom-end hardware for domestic performance engines. Callies parts are a common choice among professional engine builders competing in drag racing, engine challenge competitions, and high-output street builds where factory components are not sufficient.

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