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OK that being said the Carbs have PROMAX jet plates in the outboard and center carb metering block a 28 squitter(I think) jets 64CL 84OB and running the white springs on the vacuum secondary's Power valve is blocked off (to see what effect it has...manual brakes and steering. Timing is at 38 degrees and I am running 93 octane with booster....here is the problem - When you jump on it the car (usually) snaps your neck when the secondary's come on - that is the good....the idle prior to that is fine set at under a 1000 but after running it through the gears it stays at 1500.....no clue why.....nothing seems to stick - good free range of motion on the linkages......ideas? Thanks in advance....

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2 things i am thinking about with the idle is double check the rods going from the center carb to the outboards. the other is to check and see if the timing is not returning to your base setting. maybe springs are to weak and not letting weights return. couple of other thngs is the main jets in the center just sound a little small to me and the size or the squirter also sounds small.

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OK that being said the Carbs have PROMAX jet plates in the outboard and center carb metering block a 28 squitter(I think) jets 64CL 84OB and running the white springs on the vacuum secondary's Power valve is blocked off (to see what effect it has...manual brakes and steering. Timing is at 38 degrees and I am running 93 octane with booster....here is the problem - When you jump on it the car (usually) snaps your neck when the secondary's come on - that is the good....the idle prior to that is fine set at under a 1000 but after running it through the gears it stays at 1500.....no clue why.....nothing seems to stick - good free range of motion on the linkages......ideas? Thanks in advance....

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2 things i am thinking about with the idle is double check the rods going from the center carb to the outboards. the other is to check and see if the timing is not returning to your base setting. maybe springs are to weak and not letting weights return. couple of other thngs is the main jets in the center just sound a little small to me and the size or the squirter also sounds small.

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I was mistaken about the squirter it was a 28. Now a 25 is in it but the 25 is definitely bigger regarding the hole where the fuel comes out - it is an old part did they change the numbers? My center carb number is 4791. Thanks for the help by the ways....

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Of course, you know that the jet size and squirter size has nothing to do with the problem you are describing.

25 is smaller than 28, as they represent the squirter hole size in thousanths, unless someone drill them out.

Vacuum leak, not uncommon with the 6 pac, can cause a wondering idle speed. Or dist. mechanical advance springs that are too week to pull the weights in at idle.

I've run 6 pacs on several motors from 300 hp 383 to 600 hp 500" motors and never needed to go over 66 on the center jet except in one unique case. Three of them were dyno tuned 500" motors. Bottom line, don't take your jetting advice from me or anyone else, you need to get the right tools and figure out what you motor wants.

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going to a larger squirter - going to check the pump and see if it is a 50cc or not, go to the next size distributor springs. I have 2 new base plates on order from Holley for the outboard (4 weeks to get em is why).

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The size of the accerator pump housing, 30 CC versus 50 CC will not change how much fuel is shot into the motor on one hit Those pump housing are rated at 10 hits,pump strokes, not one I would keep changing the springs in the vacume pods until you get what you want on the carb. opening on the secondary carbs opening I ran a bolt in the slot on the center carb that the secondary throttle rods ride in to force the outboard carbs. close, I used that bolt to help open the outboards quicker and sooner that helped the 60 Ft. times at the track, it would still bog a little when driving in third gear and whomp the throttle at or above 2500 RPM I've had several six pak cars that would not bog when opening the secondarys, they would open slower and not give you the big kick in the pants when they opened like the last set did Mayby Ari will chime in on the mechanical carbs I sold him, I never ran those carbs. on the street, Ari The mechanical carbs. have accelerator pumps in all three carbs. One other thing to keep in mind when tuning a six pak set up on a large motor with regualr tires, you can still break them loose at 45+ MPH when fooling around Be careful

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I am working on getting my six pack dialed in to my new engine:
Car is 1970 Barracuda, Tremec 5 speed, Strange S60 4:10 gears
Motor is a 500 (on a RB) - Edelbrock Heads have been ported and matched to the intake, 10.5 Compression, CAM is a .252 Intake 256 Exhaust separation 109, lift Intake at .573 Exhaust .567.
MSD Distributor and 6A1 box and blaster coil....Exhaust is TTI 2" into 3.5" and 3" inch with x pipe....OK that being said the Carbs have PROMAX jet plates in the outboard and center carb metering block a 28 squitter(I think) jets 64CL 84OB and running the white springs on the vacuum secondary's Power valve is blocked off (to see what effect it has...manual brakes and steering. Timing is at 38 degrees and I am running 93 octane with booster....here is the problem - When you jump on it the car (usually) snaps your neck when the secondary's come on - that is the good....the idle prior to that is fine set at under a 1000 but after running it through the gears it stays at 1500.....no clue why.....nothing seems to stick - good free range of motion on the linkages......ideas? Thanks in advance....

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First off thanks for all the assistance. I found one issue - rear carb is binding/sticking when it gets up to engine temp. So I received new base plates from Holley and I am swapping them out. I am also going to use the PROMAX plate for the rear - just have to transfer all the parts. Understood about the pump - interesting read on how it works - love to learn something new. I will also look into modifying the center carb OB Linkage connection with a similar arrangement - after I am sure the binding is fixed and if it needs it. Again thanks for the great information.

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