 SS_in_Seattle
"4th Year" Platinum Supporting Member
Posts: 1390
Reg: 05-08-03
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06-28-12 01:42 PM - Post#2242320
Hey Guys,
Since none of the service manuals have any good pages on the Holley 4150, I was wondering if any of you have good info on working on one.
I removed the bowls to clean them out, but I think I might have adjusted the needles incorrectly when I put everything back together.
Thanks,
Greg
1965 Impala SS L78
1966 Impala SS Convertible
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 427SS65
"9th Year" Platinum Supporting Member & Moderator
Posts: 12260
Age: 67
Loc: St. Louis, MO
Reg: 12-11-03
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06-28-12 02:58 PM - Post#2242339
In response to SS_in_Seattle
I assume you are meaning the idle mixture screws on the front metering block. If so, you can turn them in until they stop (not too tight - you'll damage them) and then back them out 1-1/8 turns.
This will give you a starting position. After the car is running at idle, simply turn them individually for highest idle speed. If the speed goes too high, unscrew the throttle stop a little. Keep adjusting them alternating on both sides until there is no more increase in idle speed.
Then set the throttle stop for the correct idle (probably around 7-800 rpm).
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leon phelps
Valued Contributor
Posts: 3017
Loc: Croydon Manor, PA
Reg: 06-04-05
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06-28-12 03:33 PM - Post#2242348
In response to 427SS65
http://www.holley.com/data/Products/Technic al/199R...
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427SS65
"9th Year" Platinum Supporting Member & Moderator
Posts: 12260
Age: 67
Loc: St. Louis, MO
Reg: 12-11-03
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06-28-12 08:58 PM - Post#2242444
In response to leon phelps
Leon, thanks for the manual!
Greg, after you do the initial check, do the adjustment in Figure 15 - Float level in bowl.
You can buy little clear plastic plugs that you can screw in to keep gasoline from spilling out.
Make sure you have a friend that can shut off the engine, keep a wet rag handy, and a fire extinguisher just in case the fuel spills out of the observation hole.
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