DELCO TIMING TOOL
Used to put Delco Distributors into service mode for timing carbureted and EFI engines.
Instructions: Remove 4 pin connectors from the base of the distributor and install timing tool in its place. For carbureted engines Start the engine and then connect the single wire to a 12-volt source. Set timing to 10 Degrees BTDC, disconnect from 12 volts, and reconnect original distributor plug. Reset idle to 750 rpm.