what size carb?
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Elder User
Joined: Apr 2006
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Originally Posted by onetontruck
350 cfm stock, can go up to 600 cfm aftermarket on stock motor
Senior User
Joined: Jan 2005
Posts: 389
Likes: 4
From: Visalia, California
Edelbrock says 600 cfm is optimal. In my opinion Edelbrock is the better carb...but opinions vary.
Look here for tuning specs: http://www.sacinvest.net/ford/ford_docs.htm
Hope this helps.
Look here for tuning specs: http://www.sacinvest.net/ford/ford_docs.htm
Hope this helps.
Posting Guru
Joined: Dec 2002
Posts: 1,283
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From: Racine county, WI
More carb is not always better and in this case a 500 might be a better carb. Lets say you have a 351 that revs and falls off the power by 5k. You take 5000 (rpms) x 351 x VE (.8 at best in your average case) and then divide that number by 3456. In this senario the most that engine will ever use is 406cfm. Using the the same senario but using the 400 instead gives you 463cfm. More is not better and you will feel more power with the 500 over the 600.
Senior User
Joined: Jan 2005
Posts: 389
Likes: 4
From: Visalia, California
Click here...decide for yourself >>> http://www.sacinvest.net/ford/Edelbrock_carbs.pdf
As I said...opinions vary. But I usually trust the carb designers. Take a look at Carb #1406 on the chart.
Just my opinion, but I hope this helps.
As I said...opinions vary. But I usually trust the carb designers. Take a look at Carb #1406 on the chart.
Just my opinion, but I hope this helps.
Last edited by quehele; Apr 11, 2006 at 03:13 PM.
Posting Guru
Joined: Dec 2002
Posts: 1,283
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From: Racine county, WI
Originally Posted by quehele
Click here...decide for yourself >>> http://www.sacinvest.net/ford/Edelbrock_carbs.pdf
As I said...opinions vary. But I usually trust the carb designers. Take a look at Carb #1406 on the chart.
Just my opinion, but I hope this helps.
As I said...opinions vary. But I usually trust the carb designers. Take a look at Carb #1406 on the chart.
Just my opinion, but I hope this helps.
http://www.edelbrock.com/automotive/...ct/tech_4.html
http://www.holley.com/data/TechServi...Carburetor.pdf
It's a good thing to learn this, it means you'll be better at selecting carbs.
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Senior User
Joined: Oct 2005
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Originally Posted by quehele
Click here...decide for yourself >>> http://www.sacinvest.net/ford/Edelbrock_carbs.pdf
As I said...opinions vary. But I usually trust the carb designers. Take a look at Carb #1406 on the chart.
Just my opinion, but I hope this helps.
As I said...opinions vary. But I usually trust the carb designers. Take a look at Carb #1406 on the chart.
Just my opinion, but I hope this helps.
On a side note, if you look at the chart you posted the link to, it say's "off-road HIGH PERFORMANCE". So, if the poster wants to know exactly what cab to install, not what came on the motor, they would have to post specs on the motor, and planned use. Example, a stock, daily driven 351, would need a 500 cfm carb. A balanced and blueprinted mud running 351 that is planned to spin 6500 rpm's, would need a 600 cfm carb.
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Senior User
Joined: Jan 2005
Posts: 389
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From: Visalia, California
Originally Posted by Pre'80
Carb designers??? You mean marketing and sales department. OSin86 is 100% correct. Alway's put the correct size carb on. 460's in trucks only need 600-650cfm carbs, why put one on a 351? Unless it's built for 6500+rpm's, you will NEVER use the full range of the carb. 1403 or 1404 Edlebrock is the proper choice for a 351 in a truck if an Edlebrock brand carb was going to be installed.
On a side note, if you look at the chart you posted the link to, it say's "off-road HIGH PERFORMANCE". So, if the poster wants to know exactly what cab to install, not what came on the motor, they would have to post specs on the motor, and planned use. Example, a stock, daily driven 351, would need a 500 cfm carb. A balanced and blueprinted mud running 351 that is planned to spin 6500 rpm's, would need a 600 cfm carb.
On a side note, if you look at the chart you posted the link to, it say's "off-road HIGH PERFORMANCE". So, if the poster wants to know exactly what cab to install, not what came on the motor, they would have to post specs on the motor, and planned use. Example, a stock, daily driven 351, would need a 500 cfm carb. A balanced and blueprinted mud running 351 that is planned to spin 6500 rpm's, would need a 600 cfm carb.
Originally Posted by OSin86
They're also the one's that preach to use the formula too and it's not an opinion, it's just a fact of engine building. That chart is a genaric guide that doesn't factor anything in. The only way to size a carb is with VE, max rpm and cubic inch. You can make those carbs work fine but you're cheating yourself.
http://www.edelbrock.com/automotive/sport_compact/tech_4.html
http://www.holley.com/data/TechService/Technical/Selecting%20A%20Carburetor.pdf
It's a good thing to learn this, it means you'll be better at selecting carbs.
http://www.edelbrock.com/automotive/sport_compact/tech_4.html
http://www.holley.com/data/TechService/Technical/Selecting%20A%20Carburetor.pdf
It's a good thing to learn this, it means you'll be better at selecting carbs.
Posting Guru
Joined: Dec 2002
Posts: 1,283
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From: Racine county, WI
Originally Posted by Pre'80
What's with this "waste of time" I read in some threads??? The only waste of time is when someone posts something they know is wrong. We're all here to learn, trade "secrets", and help. No waste of time there.
