600 750
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Junior User
Joined: Mar 2010
Posts: 96
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From: Cheyenne, WY
600 750
I'm looking at doing a new carb and intake was wondering 600 or 750 carb?
It's just my dd sone mudding and I just want more power.
I've got headers and full exhaust. It's a 351m and a 4speed.
Also is the stock fuel pump enough or should I upgrade to the mr. Gasket 80gph?
It's just my dd sone mudding and I just want more power.
I've got headers and full exhaust. It's a 351m and a 4speed.
Also is the stock fuel pump enough or should I upgrade to the mr. Gasket 80gph?
Fleet Mechanic
Joined: Nov 2010
Posts: 1,501
Likes: 1
From: Axtell, TX
600cfm is plenty for your 351m. It would be way over carbed with a 750. The stock fuel pump should keep up. If you're wanting more power I would think an intake would be in order to make use of the new carb. That and a straight up timing set (most post 72 factory timing sets are retarded a few deg.).
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Junior User
Joined: Mar 2010
Posts: 96
Likes: 0
From: Cheyenne, WY
600cfm is plenty for your 351m. It would be way over carbed with a 750. The stock fuel pump should keep up. If you're wanting more power I would think an intake would be in order to make use of the new carb. That and a straight up timing set (most post 72 factory timing sets are retarded a few deg.).
Elder User
Joined: Apr 2011
Posts: 632
Likes: 1
From: Bremerton, Wa
600cfm is plenty for your 351m. It would be way over carbed with a 750. The stock fuel pump should keep up. If you're wanting more power I would think an intake would be in order to make use of the new carb. That and a straight up timing set (most post 72 factory timing sets are retarded a few deg.).
+1
the only way you'd want a 750cfm on a 351 is if you were spending most of your time above 4500rpm
otherwise you'll be loading up below 4K
(I had a 750 4bbl on my 79 Camaro with a built 383, it ran pig rich around town, but when I opened her up, she came to life about 4K, and had gobbs of power to redline. way too much carb for street driving on a small block)
you may consider a 625 Street Deomon
I'm a fan of them
Elder User
Joined: Apr 2011
Posts: 632
Likes: 1
From: Bremerton, Wa
take a look at a carburetor calculator Carburetor Size Calculator
you take your engine size
max rpm
and efficiancy (probably about 80-85%)
I put in 351ci
6Krpm
85%
and it says 518cfm
I put in 460ci
5500rpm
and 85%
and got 622cfm
you take your engine size
max rpm
and efficiancy (probably about 80-85%)
I put in 351ci
6Krpm
85%
and it says 518cfm
I put in 460ci
5500rpm
and 85%
and got 622cfm
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