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Thanks for the response! This has a custom 302 Hi-Po. Its not original. I noticed that there are three adjustment screws on my carb. turned one notice it changed idle speed. Just wondering what the other ones do. Thanks! Tony
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Im 16 and I just bought my first car yesterday. Its a 1966 Mustang with a 302 Hypo enigine. It has a holley zinc carb on it (600 cfm I THINK). I live at around 6700 ft. and I heard that the carb needs to be adjusted for higher elevations. Know how I would do this? Any help would be greatly appreciated!
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Tony-
Yes, if it's a 289 Hi-Po (there wasn't a 302 Hi-Po besides the Boss 302 and the much later 302HO which came around in '82), it should have a 600cfm carb. If the carb is original, it should be an Autolite 4100. As for adjustment at high altitudes, it may need some tweaking but if you bought the car in that area chances are these adjustments have already been made. If they haven't or if you bought the car elsewhere, I wouldn't recommend trying this yourself. It will require disassembling parts of the carb and re-jetting it to run a bit richer to make up for the thin air. Unless you're very familiar with carbs I'd leave it to a shop. Hope this helps.
Steve
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Tony-
Hmmm....3 screws you say? I'm only used to two screws so I'm a bit lost as for the third. One should be for curb idle (basically your idle in park) and the second is for in-gear idle. If memory serves (it's been forever since I saw an old Autolite.Holley carb), counterclockwise lowers idle, clockwise raises it. They're just adjustment screws and you don't really need to mess with them unless your idle starts getting rough. Hope this helps.
Steve
So the in gear idle screw would allow mean to go slower speeds while still in gear? I have noticed that I need to put the clutch in while going aorund 7 mph or slower in first gear or the car gets very very jerky. Would this screw help that?
Thanks, Tony
AnswerTony-
No...we're talking about full-stop idle, like at a stoplight...not cruising RPMs. If it's getting jerky at slow speeds in 1st, I'd check it for vacuum leaks and possibly check the spark plug wires to make sure they're in good shape. It could be more complicated like an ignition issues or a fuel problem, but my money's on something simple. Hope this helps.
Steve
