SB Chevy Rear Main 2pc. 1959-1985

The SB Chevy Rear Main 2pc. 1959–1985 is a two-piece synthetic rubber rear main seal engineered for small-block Chevrolet and GM six-cylinder engines. This seal is designed to prevent oil leakage at the crankshaft's rear exit point—a critical function in maintaining engine health and preventing oil loss during normal operation. Whether you're rebuilding a classic muscle car, restoring a vintage pickup, or performing routine engine maintenance on a legacy Chevy platform, a properly installed rear main seal is essential to long-term reliability and prevents costly oil contamination of the flywheel and transmission.

FEL-PRO's two-piece design allows for straightforward installation without requiring complete engine removal—a significant advantage over one-piece alternatives. The synthetic rubber composition provides superior heat resistance and durability compared to traditional cork or rope seals, maintaining its elasticity across the operating temperature range of small-block applications. The 2912 seal's engineered fit ensures optimal contact with the crankshaft surface, minimizing friction while creating an effective barrier against oil seepage. The compact dimensions (4.8 × 0.95 × 7.05 inches) and lightweight construction (0.09 lbs) make handling and positioning straightforward during installation.

Restoration enthusiasts, engine builders, and DIY mechanics benefit most from this FEL-PRO seal when addressing oil pan removal or transmission work on small-block Chevy and GM six-cylinder engines spanning 1959 through 1985. Installation typically occurs during gasket set replacement, engine overhaul, or when an existing seal exhibits signs of deterioration. Proper installation with clean surfaces and appropriate sealant application ensures reliable performance for thousands of miles, making this two-piece design a cost-effective solution for maintaining original-specification engine integrity on classic Chevrolet platforms.