390 carb?
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390 carb?
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<!-- BEGIN TEMPLATE: ad_showthread_firstpost_start --><!-- END TEMPLATE: ad_showthread_firstpost_start -->Ill try posting it here! I have a 71 Sport custom with a freshly rebulit 390! Rv cam, bored 60 thousands over, motor works did the heads... Everything interally is new! I have a new holly street avenger 670. And Im having troubles with it . So I wanna look into getting a edelbrock! Just wondering what size I should run in the performer series?
600 Or 750 cfm?
<!-- BEGIN TEMPLATE: ad_showthread_firstpost_start --><!-- END TEMPLATE: ad_showthread_firstpost_start -->Ill try posting it here! I have a 71 Sport custom with a freshly rebulit 390! Rv cam, bored 60 thousands over, motor works did the heads... Everything interally is new! I have a new holly street avenger 670. And Im having troubles with it . So I wanna look into getting a edelbrock! Just wondering what size I should run in the performer series?
600 Or 750 cfm?
Post Fiend
Joined: Mar 2004
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From: Union, Washington
What kind of trouble? The Holley carbs are stupid simple to fix. If you insist on buying an old school pain to tune Edelbrock (a Carter carb made pretty) get the 600, anymore is a waste of money.
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Joined: Nov 2003
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From: southeast Idaho
If you can see it on the outside it probably got coated with battery acid at some point in time, possibly even before being put on your vehicle. If thats the only thing wrong with the carb, just get a new bowl and put on it. If you just have to have an edelbrock then a 600/ 650 is plenty as stated above
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Yea, its not the actual bowl thats chipping! Its The side the main jets are on! Ill try holley and see if i can order one! For now I got a 750 edelbrock! Would have went with the 600 but my 390 is always starving.. So ill give it a try!!!
Post Fiend
Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
Your engine is not starving because of the carb, tuning maybe, but not from carb size. A 600 will serve to 5300 rpm on a 390. While a 750 is a 6600 rpm carb and I will bet your engine has reached it's peak power long before that, probable right around that 5300 mark. Oh and Ford saw fit to use a 600 carb on the 390GT engine. Hell the 428CJ only came with a 735 CFM carb and they did 6000 from the factory.
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Your engine is not starving because of the carb, tuning maybe, but not from carb size. A 600 will serve to 5300 rpm on a 390. While a 750 is a 6600 rpm carb and I will bet your engine has reached it's peak power long before that, probable right around that 5300 mark. Oh and Ford saw fit to use a 600 carb on the 390GT engine. Hell the 428CJ only came with a 735 CFM carb and they did 6000 from the factory.
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Sure they told you a 750, they made more money off you with the 750. But then it's your money and you can listen to the try to make as much money out of your pocket as he can, or listen to someone who only wants you to be as quick as you can. There are carb CFM calculators out there and they all say you and your sales morons are wrong, but hey it's your money, spend it for a too big of a carb and slower throttle response it you want. You have a truck not a Mustang and a Mustang motor will be a dog in your big heavy truck.
It is a half ton with a build 390! She could be a mustang
Post Fiend
Joined: Mar 2004
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From: Union, Washington
Hey You know there is only one way to learn! But price wise It was cheeper to buy the 1407 manual choke and buy the electric choke kit witch i did, Then buy the 1406 electric choke!! But overall so far she has great T response! I have a little to tunning to do for high rev 3rd gear!! but hell Im happy, I always have the holley to fall back on!
It is a half ton with a build 390! She could be a mustang
It is a half ton with a build 390! She could be a mustang
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Joined: Jan 2006
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From: Little Falls,New York
How about a 500 cfm 2 v? I have one in my truck, with a 390. Not too impressed with the overall performance of it, but don't know if I want to go to 4v.Is there a way to tune it a little better to suit my needs and make it a better runner?
Post Fiend
Joined: Mar 2004
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From: Union, Washington
A Holley tech at the National in Oklahoma one year (don't ask me what year) told me that when it comes to carburation, a lot of little holes is always better than a could of big holes. A 500 CFM 2V is a couple of big holes. My 500 Holley 2V was worse for gas mileage and preformance on both the 360 and the 390 I had it on.