which carb
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Junior User
Joined: Nov 2007
Posts: 69
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From: Bonne Terre,Mo 63628
which carb
Hey moter heads, Ain't this forum fricken fantastic!! I do as much car fixen as i can myself, to save money and i like it!. But a mechanic i am not. So i have a stock rebuilt 390, except for the RV cam, about 1000 miles on it now runs real good. Right now it on a 68 ford 3/4 2wh pickup, thats what it had from the factory i think. I am going to get a weiand 4 barel intake 7282. Now which carb?? What i am looking for is 0 to 70 as fast as i can get there, not worred about millage. So the truck will be setting or hauling or going 0 to 70. That is about it. I like the holly D. pumper #0-4779s which is a 750. Any advice?
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
I would run a 670 Street Avenger, plenty big for that motor then adjust the secondary opening timing with their spring kit.
Unless your compression is raised with a good exhaust system and the dizzy curved to match you could be leaving a lot of power on the table.
Your asking a lot for that motor to haul butt as that truck is heavy.
Unless your compression is raised with a good exhaust system and the dizzy curved to match you could be leaving a lot of power on the table.
Your asking a lot for that motor to haul butt as that truck is heavy.
Logistics Pro
Joined: Oct 2005
Posts: 3,785
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From: Mddl A MexCans
So is my truck but with a fiberglass bed, fenders and hood I sense a Jenny Craige spotlight opportunity... LOL Pretty sure I'll be able to take an Acura etc.. in reverse towing one of those Phat biA tches!! LMAO 
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Ford ran the 600 CFM Holley with vacuum secondaries on the 390GT motor and that is an outstanding set up for what you are doing. It's what I ran in my '68 F250 with 390. A 750 DP is all wrong for your application. Too big and when you stomp on it and all 4 throttle bores pop open the engine will fall flat on it's face, extra accelerator pump and all. DPs don't belong on a truck motor, truck is just too heavy.
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Elder User
Joined: Oct 2002
Posts: 713
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From: Kearney, Nebraska
My390:
Listen to them - a 750 is too much Carb. I have a 750 DP on my newly rebuilt 360 With a RV Cam and although it runs good, I would have put a 650 on it had I not had the 750 sitting on my shelf.
George
Listen to them - a 750 is too much Carb. I have a 750 DP on my newly rebuilt 360 With a RV Cam and although it runs good, I would have put a 650 on it had I not had the 750 sitting on my shelf.
George
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Elder User
Joined: Sep 2007
Posts: 521
Likes: 0
From: new mexico
shelby made a bis mistake in 1967
428 medium riser.
2 600's
it blew black smoke like a mack truck.
68 they went to one carb and cobra jet engine.
ran away from the 67's-was the ticket. did same in 69.
actually blocked my 2nd carb and ran on just the first carb and sometimes just on primary.
still ran away from most cars. easily.
428 medium riser.
2 600's
it blew black smoke like a mack truck.
68 they went to one carb and cobra jet engine.
ran away from the 67's-was the ticket. did same in 69.
actually blocked my 2nd carb and ran on just the first carb and sometimes just on primary.
still ran away from most cars. easily.
Posting Guru
Joined: Jul 2003
Posts: 2,232
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From: Colville, Washington
Has anyone looked at the Weiand 7282 intake?? It looks like a short single plane design with a divider plate, not a very efficient design from the looks of it. I think he would be better off with the standard Performer for his engine. JMO
Elder User
Joined: Mar 2004
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From: Klamath Falls OR
Originally Posted by Bear 45/70
A 750 DP is all wrong for your application. Too big and when you stomp on it and all 4 throttle bores pop open the engine will fall flat on it's face, extra accelerator pump and all. DPs don't belong on a truck motor, truck is just too heavy.
I'm sorry but I have to call B.S. on a 750DP being too BIG! I ran one on a 390 with an R.V. cam & a Performer intake. Ran awesome and still got 14 to 16 mpg. And got with the program when you mashed it down! By the way mine was a moded 750DP (more like 830CFM). That was in a lifted F-150 with 35" tires and 3.50 gears and a NP435/205 case.
Then I changed it to a 428 11to1 with a solid roller cam in it. That was even better yet. A 750DP will work just fine if that's what you want. Its all in the tuning and how well is your ability to tune. JMHO
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by Ford428CJ
I'm sorry but I have to call B.S. on a 750DP being too BIG! I ran one on a 390 with an R.V. cam & a Performer intake. Ran awesome and still got 14 to 16 mpg. And got with the program when you mashed it down! By the way mine was a moded 750DP (more like 830CFM). That was in a lifted F-150 with 35" tires and 3.50 gears and a NP435/205 case.
Then I changed it to a 428 11to1 with a solid roller cam in it. That was even better yet. A 750DP will work just fine if that's what you want. Its all in the tuning and how well is your ability to tune. JMHO
Then I changed it to a 428 11to1 with a solid roller cam in it. That was even better yet. A 750DP will work just fine if that's what you want. Its all in the tuning and how well is your ability to tune. JMHO
muscle car, not on a heavy truck. You want those secondaries to open when the motors needs them, not when you tromp on the foot feed. Do you have time slips with a 600 and then with you DP to prove your statement? I doubt it and the worse thing in the world for determining performance is the drivers butt. Now a 428 with 11:1 with and a good cam works. Why, because the factory 428CJs came with a 735 CFM carb. And I was racing 428CJs when the had just come out.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by Ford428CJ
I say run what you like but a 750 DP isn't BIG for a 390. Might be for a 360.....
Last edited by Bear 45/70; Nov 26, 2007 at 12:03 AM.