The correct idle RPM for a Dodge 318 engine depends on the year of the vehicle and whether it's equipped with an automatic or manual transmission. There's no single number. However, a generally accepted range is
650-850 RPM for most applications.
To find the *precise* specification for your specific Dodge 318, you should consult your owner's manual. That manual will give the exact idle speed recommended by the manufacturer for your year, model, and transmission type.
