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Reference Information

Vacuum Advance, Vacuum Lock Out, HEI, GM, Standard Rotation Rotation Distributor, Each

If you're not looking to use your HEI's vacuum advance, block it off with an HEI distributor vacuum advance block-off plate from Top Street Performance! Their block-off plates come in applications designed to work with standard rotation (clockwise) with vacuum advance for TSP or GM HEI distributors or reverse rotation (counter-clockwise) with vacuum advance for HEI distributors. Order the block-off plate designed to fit your needs.