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Help w/ Properly Adjusting a Holley 650 Double Pumper; Holley Carb Adjustment
Topic Started: Apr 10 2012, 09:35 PM (3,831 Views)
Camaros4Life
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84' Camaro Conversion
Besides needing help with properly adjusting my Holley 650 Double Pumper, I figured like my other topic, Help w/ Adjusting Timing, this could become a sticky for future reference for NYTG Users.

So I have a Holley 650 Double Pumper, with Mechanical Secondaries and an Electronic Choke.

If the engine specs are needed for proper adjustment I will post them up.

I would like to Thank BlackBmagic in advanced.


Whats my first step in adjusting my carb?
Posted Image
Engine:
-350ci Small Block Chevy, Punched out .060 to make 360Ci, Speed Pro Flat top pistons --Edelbrock Ram Air 2 --Quick Fuel 750 DP --Patriot Performance Freedom Series Aluminum Heads: 2.02 / 1.60 --Comp Cams Xteme Energy Cam .507/.510 --Hooker Super Comp Shorty Headers --FlowMaster 40 Series Muffler --MSD HEI, 8.5mm Wires -- Champion 4 Core All Aluminum Radiator

Transmission / Driveshaft / Rearend:
-Mad Dog Stage 3 700r4 --3in Custom Build Driveshaft --4.10 Posi --Upgraded Front Disk Brakes --Subframe Connectors

Interior:
-Black Panels, Carpet, Headliner --4th Gen Black and Yellow Seats --B&M Mega Shifter --Yellow Interior Gauge Lights

Exterior:
-2010 Corvette Yellow --(91-92) Aero Ground Effects --3 Inch Cowl Hood --Weld Draglites 15x7 Fronts 15x8 Rears Wrapped in M/T Sportsman Tires --86 Firebird Spoiler --6000k HID's
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Deluca119
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I give up !!
Il be following this thread closely, considering I have the same exact carb.. and bought it off charlie. So his advice on tuning his old carb should come in handy.
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BlackMagic
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Senior
If you want to do this right its going to take some time and effort. You will have to get yourself accustom to parts of the carb like jets, squiters, power valves, fuel bowls, sights, idle screws....and know what and where they are.

First things first. You need to set the fuel level perfect. Go to sk speed and get some glass sight plugs or order them, they are like 4 bucks. Deluca has them on his carb that I sold him. Set the primary one to where gas is right at the bottom edge of the glass. Then set the sec one just below the glass to where you have to shake the car to see it in the glass.

Now....Find you primary jets and note the size. Buy jets that are 2 sizes, 4 sizes, 5 sizes, and 6 sizes smaller and then only 2 sizes larger.

Step down the primary jets 2 sizes, then take it for a drive. You are looking for a slight surge or hesitation while steadily cruising around 55mph. If it doesnt do it continue with 4 sizes smaller jets, then 5 sizes, then 6...until it surges slightly. You get the point.

Now what do you do...go up 2 jet sizes and those will be your new jets that you use permanently.

now you want to get the car into a high gear around 35mph highest gear possible. Punch the throttle, there will be a flat spot or no power. Fix this by changing the PRIMARY power valve. Get yourself a 125-105 power valve. pretty sure that's what I put in mine. I never did to much investigating with this I just left because it worked. I have only used the 125-105 valve(10.5hg) The flat spot should be much much better.

Take the carb off, flip it over, and look for the transition slot(if you dont know what that is look up the holley schematic). You are going to want slightly less than .050" of it exposed below the throttle blades (this will show up as a TINY square shape. If more of it was originally exposed than that, open the sec throttles with their idle screw, 1/8 turn then put the carb back on start the car warm it up and re-set the idle speed(800rpm should be good). Then set the idle mixture.....

To set the idle mix, turn each primary idle screw in until the engine rpm drops SLIGHTLY. Then back them out 1/8 turn. Its a good idea to have an electronic diagnostic tach here) they are cheap sometimes multimeters have them built in.

Make sure they are no more than 1/8 turns different from each other.


The carb should be running as sweet as it can at this point.

Thats pretty much all that I have learned if you have any specific questions, ask. Do your hw though, there is a lot to know about a carb.


Everyone has their own tips and tricks Im sure we will all get some good info from this thread.





Edited by BlackMagic, Apr 10 2012, 11:29 PM.
Posted Image
355 hot tanked, ground, and painted/KB icon FHR pistons/eagle ESP rods, ARP 2000 rod bolts/882's ported , bolt in studs/Comp cam/Timing gears
Victor JR intake port matched/Mighty demon 750/Rebuilt T-5 bronze bushings/billet keys/Auburn Posi 3:73 gears
MSD HEI limit modded/Hooker comps/ 3" Y-pipe/4" sinister exhaust/Hooker 4" Max flow muffler/Founders tubular LCA/Prothane bushings
Dropped/Fully Shaved and smoothed exterior and engine bay/VPA door kit/Viper red RN/C5 wagon wheels
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black83zee
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Media Specialist
I use a vacuum gauge....print out and read this:.....it's got pictures!

http://www.chevyhiperformance.com/howto/45638/index.html
Edited by black83zee, Apr 11 2012, 07:21 AM.
Posted Image
350, carb, headers, side exhaust, T-5, aluminum ds, Baer discs, Bilsteins, tubular a-arms,
tubular torque arm, adjustable track bar and control arms.



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Camaros4Life
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84' Camaro Conversion
I will have to go to SK and pick up some parts in the next few days. I know my way around the carb pretty well, with jets, idle screws, power valves, etc. I will price the stuff out and try and pick it up as soon as possible.

^Black83zee I have seen that before and had it bookmarked allready lol.
Posted Image
Engine:
-350ci Small Block Chevy, Punched out .060 to make 360Ci, Speed Pro Flat top pistons --Edelbrock Ram Air 2 --Quick Fuel 750 DP --Patriot Performance Freedom Series Aluminum Heads: 2.02 / 1.60 --Comp Cams Xteme Energy Cam .507/.510 --Hooker Super Comp Shorty Headers --FlowMaster 40 Series Muffler --MSD HEI, 8.5mm Wires -- Champion 4 Core All Aluminum Radiator

Transmission / Driveshaft / Rearend:
-Mad Dog Stage 3 700r4 --3in Custom Build Driveshaft --4.10 Posi --Upgraded Front Disk Brakes --Subframe Connectors

Interior:
-Black Panels, Carpet, Headliner --4th Gen Black and Yellow Seats --B&M Mega Shifter --Yellow Interior Gauge Lights

Exterior:
-2010 Corvette Yellow --(91-92) Aero Ground Effects --3 Inch Cowl Hood --Weld Draglites 15x7 Fronts 15x8 Rears Wrapped in M/T Sportsman Tires --86 Firebird Spoiler --6000k HID's
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