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Old 04-05-2010, 10:39 AM
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Small carb issues

Hello. I am putting together a Chevy 383 and would like to know what I would expect if I put my 500 cfm Carb on it. Will it just limit my power? Will it do some damage? Just curious since I already have the Carb and have not settled on a new one yet.

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Old 04-05-2010, 10:46 AM
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Quote:
Originally Posted by mannyandlily
Hello. I am putting together a Chevy 383 and would like to know what I would expect if I put my 500 cfm Carb on it. Will it just limit my power? Will it do some damage? Just curious since I already have the Carb and have not settled on a new one yet.
Properly calibrated (tuned), it will not damage your engine. It will limit the max output.
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Old 04-05-2010, 01:30 PM
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Ditto, but mated to the proper other components can be made to rune very good. I have seen plenty of 2 barrel SBC's running 12 second quarter miles.

Vince
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Old 04-06-2010, 07:59 AM
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Thanks for the response. I'll use the 500 cfm in the beginning and decide if I'm happy with it. I'll keep an eye out for a 600-650 in the meantime.
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Old 04-06-2010, 03:16 PM
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If you find out that your 500 does not work well if you go to ebay you can get a refurbished 600cfm holley carb from holley them selves for about 50 bucks less then a brand new one and they are basically brand new carb not worn out ones that was rebuild. I put one on my 350 and I had to go up 5 jet sizes on the front to get it where I need it but it runs really well. It also depends on what cam you got too.

Is your motor basically a stock type motor or is it built with high flowing heads big cam etc. That also plays into if the carb can work for your engine. Fuel curve has a lot to do with things too and if you got a big cam to small of a carb will never idle right without doing a lot of things. Hope it works out for you.
Eric
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Old 04-06-2010, 09:17 PM
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The 383 will have Performer heads, 9:1 pistons, Vortec heads with new springs to accommodate a Comp Cam with .495int/.502exh lift and 110 lobe sep. I would think the 500 cfms will be sufficient for street cruising.
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Old 04-06-2010, 09:46 PM
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After going to the trouble of building a performance engine, why choke it down?

I would think that 600cfm would be a minium for a 383 with upgrades.

I run a Q-Jet on my stroker. TF heads, Edelbrock RPM intake, true duals, CC XE274H cam.
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Old 04-11-2010, 12:49 AM
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cfm = (RPM X VE X CID)/3456 = (5000 X 0.95 X 383)/3456 = 526.20 cfm

Your 500 cfm carb will do just fine for cruising. Anything more and you will need the 600 cfm carb:

cfm = (RPM X VE X CID)/3456 = (6000 X 0.95 X 383)/3456 = 631.68 cfm
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Old 04-11-2010, 09:11 PM
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Quote:
Originally Posted by mannyandlily
The 383 will have Performer heads, 9:1 pistons, Vortec heads with new springs to accommodate a Comp Cam with .495int/.502exh lift and 110 lobe sep. I would think the 500 cfms will be sufficient for street cruising.
You can cruise it with a 1-bbl, but if you want power, it needs at least a 750.
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