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The Peterson front crank seal for GM big block applications is a replacement front main intended for big block Chevy use and related large-displacement GM engines. Features notes also reference Ford 302/351 front crank sealing, and Peterson seals are specified for engines running crankcase vacuum. They aim to hold elevated vacuum levels, a helpful trait for dry-sump and vacuum-managed crankcase systems.
Peterson Fluid Systems GM B/B Front Crank Seal
