Synchronizer Carb Sync
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Synchronizer Carb Sync
 MOTION PRO Sync PRO Carb Tuner Tool Synchronizer US $80.99 
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 Vacuum Carburetor Synchronizer carb sync Gauge Honda GS CB KZ 550 650 750 850 US $66.50
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 Vacuum Carburetor Synchronizer carb sync Gauge CB GS KZ 550 650 750 850 US $64.50
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 Vacuum Carburetor Synchronizer carb sync Gauge Yamaha XS XJ 1100 1200 US $119.50
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 Carburetor Synchronizer Tool Twin carb sync tool 2 Cylinder Gauges Throttle Body US $42.95
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 Motion Pro Sync Pro Carb Carburetor Tuner Synchronizer US $85.89
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 Vacuum Carburetor Synchronizer carb sync Gauge 2 cylinder bike Honda CB CL350 US $34.50
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 Vacuum Carburetor Synchronizer carb sync Gauge Honda GL 1100 1200 1500 US $64.50
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 Carburetor Synchronizer Tool Twin carb sync tool 4 Cylinder Gauges Throttle Body US $74.95
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 MOTION PRO SYNC PRO Carb Tuner Tool Synchronizer with 5mm Adapter 6mm Available US $82.50
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 Carburetor Synchronizer 2 Two Cylinder Twin Carb Sync Tool Gauge Gauges 38040004 US $50.75
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 RACEPRO MERCURY CARB CARBURETOR TUNER SYNC SYNCHRONIZER US $114.94
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 Motion Pro Tools Sync Pro Carb Tuner Carburetor Synchronizer US $79.99
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 Carburetor Synchronizer carb sync Gauge Honda CBX1000 US $92.50
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 NEW MOTION PRO CARBURETOR CARB 5 MM ADAPTER TUNER SYNCHRONIZER SYNC US $9.95
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 MOTION PRO SYNC PRO CARB TUNER TOOL SYNCHRONIZER US $82.94
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 MOTION PRO Sync PRO Carb Tuner Tool Synchronizer w Manometer Refill 2PK 08 0415 US $89.95
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 Motion Pro 6mm Brass Carb Sync Syncpro Adapters Carburetor Synchronizer US $12.99
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 Carburetor Synchronizer Carb Sync Tuner Gauge 4 Carb Adjuster Set 3804 0005 US $89.95
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 MOTION PRO SYNC PRO CARB TUNER TOOL SYNCHRONIZER Set of 2 US $154.00
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What is the power difference between a four barrel Holley carburetor and dual su carburetors?
I have a 1971 datsun 240z with dual su carbs.Lately my car has been stumbling on me alot. When I try driving it I give it gas but it just stumbles and it won't move. I tried cleaning my gas tank n sealing it, replacing fuel pump, filters all that good stuff. All of my ignition was also replaced wires, sparkplugs, cap,rotor,and the coil. Now I know my carbs are out sync but I've tried syncing it with a synchronizer but no luck. So I been thinking about replacing the su carbs either with a single four barrel Holley carb or with original restored su carbs. So I want to know what the difference in power is and if my problem can be fixed how can i fix it. Thanks
Hi Josh! I would recommend you rebuild or replace your SU carbs assuming the rest of the engine is stock.
The main reason dual side-draft carbs have sync problems is because of the linkage system is worn out. Get it repaired or replaced along with both the carbs and your carburetion issues should be solved.
Installing a Holley 4bl is an option but realize it requires a new intake manifold, air cleaner, throttle linkage and likely a certain amount of fabrication to work right.
As far as a power difference, you MIGHT see a small difference in the top end power using the Holley but unless your engine has been modded and set up to take advantage of the increased CFM your probably just going to be wasting fuel and money.
But..If your dead-set on using a Holley 4bl you could do what I did with my 71' 240Z....Rip out the stock 6cyl and install a Chevy 350 V8. 
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