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The Peterson front crank seal for Chevrolet LS1 applications is a replacement front main seal for LS1 engines. Peterson seals are specified for use on engines running crankcase vacuum and are intended to maintain elevated vacuum levels that aid crankcase control. That vacuum-holding trait is valuable in dry-sump and other vacuum-managed systems where steady vacuum supports better oil handling.
Peterson Fluid Systems Chevrolet LS-1 Front Crank Seal
