1972 351c 2V Automatic-Park Idle Speed

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Jaysay

Member
Joined
Jan 24, 2022
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My Car
72 Mustang Fastback 351c 2v
Hey y’all, have another question concerning my 1972 mustang. Finishing up with my adjustments to close the hood on the project. It shows Idle Speed in Drive should be 575, which I have set. In park, it idles around 750-800rpm, wanting to confirm if that’s about right an compare to what others idle at while in park. I believe I read the intake vacuum is higher when not under a load?
 
That drop seems normal from neutral to drive. Engine vacuum will definitely be higher in neutral than in drive.
 
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