Picking a Carb Size
04-17-2003, 03:41 AM
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Car: 92Z28, 99SS, 83Z28 & 86GTA
Engine: 421, LS1, 327Turbo & 383
Transmission: T-56, 4L60E, T5 & 4L60
Axle/Gears: 4:10, 3:42, 2:73 & 3:27
Picking a Carb Size
I am asking for a friend of mine that wants to know what size of carb to get. He was thinking a 625, but wanst sure.
Setup is a 327ci in his 85 Z28 5-Speed
Flattops
Ported Vortec heads
Edelbrock Vortec RPM AirGap
Comp Cams Magnum 270h 224/224 .470/.470
Setup is a 327ci in his 85 Z28 5-Speed
Flattops
Ported Vortec heads
Edelbrock Vortec RPM AirGap
Comp Cams Magnum 270h 224/224 .470/.470
04-17-2003, 04:09 AM
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Car: Camaro
Engine: 355
Transmission: th-350
Axle/Gears: 3.73 welded
around 600 maybe...any bigger and the floods are-a-comin ...not to mention all the spark plugs that would be fowled 
I hate that
I hate that
04-17-2003, 09:30 AM
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Floods are coming from a bigger carb? It's a good thing GM never used something bigger than that, like a Quadrajet. 
04-17-2003, 12:07 PM
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Car: Camaro
Engine: 355
Transmission: th-350
Axle/Gears: 3.73 welded
yeah floods... I made that mistake once before put a 750 ( I know it not that big of a carb) on a mild mod. 305 ...lol ..the plugs that thing went through ...and it ran baadd ...so we droped it down to a 650 and it worked and ran like a dream.
04-17-2003, 12:09 PM
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Flooding doesn't come from having too large of a carb, it comes from having the floats set wrong, or a bad needle and seat, or an internal leak, or some other problem.
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04-17-2003, 01:19 PM
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Oh yeah. - That formula works for a motor w/ 100% effieciency. They said something like 65% is a typical motor, 75-85% is a typical hipo motor and about 95%+ for motors like pro stock. - They say to acount for this you run a smaller carb. If your calculation says run a 780, run a 750.
04-17-2003, 07:47 PM
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Car: 92Z28, 99SS, 83Z28 & 86GTA
Engine: 421, LS1, 327Turbo & 383
Transmission: T-56, 4L60E, T5 & 4L60
Axle/Gears: 4:10, 3:42, 2:73 & 3:27
So by the sounds of it a 625 would do him good.
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