‘67 barracuda heat soak and timing issues
First get the initial timing. Then adjust the idle fuel mix. Then check rpm in gear. Then can repeat to fine tune. The least drop in rpm and vacuum when going into gear is the strongest idle. How much effort you put in before calling it good is up to you.
A non-smogged factory perfromance engine would have idled as low as 500-600 rpm even with the load of the A/C running.
With the lower initial timing of the early Clean Air Package, idle speed had to be increased to make up for the loss of mechanical efficiency and power.
It depends on what was done to the engine. 750 rpm in neutral is doable when warmed up unless the cam is a bit radical.
First get the initial timing. Then adjust the idle fuel mix. Then check rpm in gear. Then can repeat to fine tune. The least drop in rpm and vacuum when going into gear is the strongest idle. How much effort you put in before calling it good is up to you.
A non-smogged factory perfromance engine would have idled as low as 500-600 rpm even with the load of the A/C running.
With the lower initial timing of the early Clean Air Package, idle speed had to be increased to make up for the loss of mechanical efficiency and power.