Out of stock
SKU: PGEM3840C4
MPN: M3840C4
The BBM 383-440 Cross Bolt Center Main Caps are designed for serious engine builders and performance enthusiasts who require exceptional block integrity under extreme horsepower and boost conditions. These caps are a vital upgrade for big-block Mopar platforms, where factory fastening may not withstand the demands of modern forced induction or high-RPM naturally aspirated builds.
Pro-Gram Engineering's cross-bolt design distributes clamping load across a larger surface area than conventional center main caps, effectively reducing stress concentration at critical crankshaft journals. This design reinforces the cap structure and prevents deflection under peak cylinder pressures, which is a common failure point in high-output big-block applications. The caps are precision-manufactured to ensure proper alignment with existing block bores and fastener holes.
Engine builders, machinists, and dedicated Mopar performance shops rely on these caps for high-performance applications, including street strokers, competition drag engines, and high-boost forced-induction platforms. Their robust construction is essential for handling the dynamic loads generated by aggressive cam profiles, nitrous oxide, and turbocharging.
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