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1972 510 & Pickup Engine Modification: Adjustment

With air cleaner installed, engine at normal operating temperature, connect a tachometer and a timing light.

  1. Set idle speed at about 700 RPM and adjust ignition timing to 7° BTDC. Operate engine at 2, 000 RPM for about 15 seconds and then let idle for one minute.
  2. Set to best idle at 750 RPM (770 RPM on automatic transmission) by means of the throttle adjusting screw and idle adjusting screw.
  3. Set engine speed at 700 RPM (720 on automatic transmission) by turning idle adjusting screw clockwise to lean out mixture.
  4. Connect lead wire between advanced and retarded side of distributor. Engine speed should drop about 100-150 RPM. Check ignition timing with a timing light. It should be TDC. If not, stop engine and adjust position of retarded breaker points.
  5. Start engine and check timing. Repeat adjustments until TDC is achieved.
  6. Disconnect lead wire between advanced and retarded side terminals of distributor and check to make sure that ignition timing is now 7°BTDC.
  7. Set idle speed to 700 RPM (720 RPM on automatic transmission) by turning throttle adjusting screw and adjust percentage of carbon monoxide to 2.0% at this idle speed. On automatic transmission vehicles, make sure that idle drops to 600 RPM in "Drive".
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