Rear Seal Adapter Sbc

The MOROSO Rear Seal Adapter SBC (part number 38415) is a precision-engineered aluminum adapter designed to convert small-block Chevy engines from one-piece rear main seal configuration to a two-piece crank seal setup. This adapter is essential for engine builders performing retrofits, upgrades, or restorations where crankshaft compatibility differs from the original block design. The aluminum construction keeps weight minimal while providing the rigidity necessary to maintain proper seal function under engine load.

Engineered for small-block Chevy applications spanning 1955–1986 pan configurations, this adapter bridges the mechanical gap between one-piece block seal surfaces and two-piece crankshaft design. The kit format includes all necessary components for installation, eliminating the need for sourcing multiple parts separately. Proper rear main seal installation is critical to prevent oil leakage at the crankshaft journal—a common failure point on older and rebuilt engines where block and crank configurations don't align natively. This adapter solves that compatibility challenge without requiring costly block modification or crankshaft replacement.

This product is built for engine rebuilders, restoration enthusiasts, and performance shops performing small-block Chevy stroker conversions, crate engine installations, or vintage engine restorations. The 1.19 lb weight and compact profile (6.85 × 1.7 × 7 inches) integrate seamlessly into tight engine bay environments. MOROSO's reputation for precision engine accessories ensures fitment accuracy and long-term reliability in both street and race applications where seal integrity is non-negotiable.