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All Models (Exc. Corvette), 350"/300 HP & 400"/335 HP (1970)

  1. Disconnect and plug distributor vacuum advance line. Turn mixture screws in (clockwise) until lightly seated, then turn out (counterclockwise) four turns.
  2. Adjust carburetor idle speed screw to obtain 630 RPM with automatic transmission in "D" position, or 775 RPM with manual transmission in Neutral. Adjust mixture screws equally to obtain 600 RPM with automatic transmission in "D" position, and 700 RPM for manual transmission in Neutral. Reconnect distributor vacuum advance line.
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