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Old 04-19-2010, 08:32 AM
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750 holley carb

is a 750 holley carb to big for a 350 small block i was told to use a 600 or 650
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Old 04-19-2010, 03:23 PM
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Welcome to the site, 600 probably would be better but i have ran a 750 before depends on which 750 you are talking about.JMO


Cole
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Old 04-19-2010, 03:54 PM
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Depending on your intended purpose, 750 is most likely overkill. You'll lose throttle response compared to using a 600-650. If you plan on going floorboard form stoplight-to stoplight...every time, then put the 750 on. Otherwise be realistic and go with a 600 or 650 vacuum secondary.

Otherwise you'll be writing a thread like every-other thread on here, of people asking why it's not running right even though they bought the "most expensive" this, and "the best" that...and it doesn't run right. Most times, the best solution is to keep it simple.
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Old 04-19-2010, 04:08 PM
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Quote:
Originally Posted by 67impalla
is a 750 holley carb to big for a 350 small block i was told to use a 600 or 650
What it really comes down to is what mods have been done to the engine. Is it a bone stock engine or has it had up-grades and what are they if it has. This will determine what carb you need, and not only engine but it would be nice to know what gears and converter are you running also everything comes into the mix if you want it to perform like it should. JMO


Cole
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Old 04-19-2010, 05:19 PM
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Let me try to explain sizing of carb(s) on an engine. typically a well engineered street engine will attain about 90% volumetric efficiancy. A 350 cu. in. only draws air/fuel every other stroke so if it spins 8000 rpm, it will could possibly draw 1,400,000 cu. in. of air/fuel. Since there are 1728 cu. in. in one cu. ft, you have 810 cu. ft, but since volumetric efficiancy is 90% we need a carb that flows about 730 cfm. If your engine is built to pro stock specks it might have upwards of 115% or 120% VE. If it is a hydraulic cammed street engine, it may be as low as 75%, also it probably won't spin near 8000 rpm.
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