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  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

engine idle speed

  • Thread starter Thread starter Dugan
  • Start date Start date Jan 6, 2008

Dugan

New Member
Mar 21, 2007
47
0
0
Portage Mi
Jan 6, 2008
#1
  • Jan 6, 2008
  • #1
What should my mustang idle at when it is in drive? it is a 67 coupe, with a 4 bbl 302 out of a 68. it has a holley 600 cfm 4 bbl carb, a 1 inch carb spacer and a edelbrock performer rpm intake. other than that the engine is stock (i think)although i think it may have a mild cam? this was sorta a mystery car when i got it
right now it idles at about 600 rpm is this where it should be?

thanks in advance.
 

jcp123

New Member
Nov 1, 2003
408
0
0
Tyler, TX
Jan 6, 2008
#2
  • Jan 6, 2008
  • #2
I have always gotten good results with 600 in D as well. Start there and if it idles a little rough, try stepping it up ~50rpm or so.
 
D

D.Hearne

New Member
Sep 29, 2000
11,730
6
0
south louisiana
Jan 6, 2008
#3
  • Jan 6, 2008
  • #3
Set it to as low as possible and not have it stall. More cam(overlap) and intake (single planes usually) require higher idle speeds.
 
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