Front Main Cap - BBM 383-440 2-Bolt

The PRO-GRAM ENGINEERING Front Main Cap BBM 383-440 2-Bolt is a precision engine component designed for big-block Mopar enthusiasts and professional engine builders working with 383 and 440 cubic-inch platforms. This front main cap is a critical structural element in your engine's crankshaft support system, bearing the loads generated during combustion and acceleration. It is ideal for rebuilding classic muscle car engines or restoring Dodge or Plymouth performance mills.

The 2-bolt design of this front main cap adheres to the original specifications for early big-block Mopar engines, providing dual fastening points that distribute clamping force evenly across the bearing saddle. Pro-Gram Engineering manufactures this cap to tight tolerances, ensuring precise bore alignment and proper bearing crush—critical factors that prevent crankshaft deflection and bearing failure under high RPM conditions. The compact 3.4 x 3.4-inch cross-section fits within the tightly engineered block passages of Mopar big-blocks, while the 5.8-inch depth accommodates the full journal diameter with room for proper bearing installation.

At 2.6 pounds, this cap is light enough for street engines yet robust enough for performance applications when properly torqued to manufacturer specifications. Engine builders will appreciate the reliability and structural integrity this cap provides, ensuring long-term operation in demanding conditions. Whether you're restoring a classic or building a performance engine, this front main cap is a dependable choice for your project.