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Unread 01-26-2010, 04:33 PM   #1
SonicR1
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2 barrel or 4 barrel on 304

Just bought this thing and it has a 2 barrel on it, but came with Holley 4 barrel and edelbrock manifold for it. Is there enough differance for me to throw the 4 barrel on???

Thanks-Bill

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Unread 01-26-2010, 04:43 PM   #2
AFjeepMan
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yeah...do it!!! something like a 600cfm 4-barrel will def be better than that 2-barrel
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 01-26-2010, 06:41 PM   #3
mowjoecj
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I kept my 2 barrel. the primarys are bigger than going to a small 4 barrel. to me the fuel milage is better, and i have a cam, headers etc. also a 304 is a small v8, so you don't really need a 4 barrel. however (I like talking out of both sides of my mouth) if the 2 barrel needs repair or doesn't run well and the 4 barrel is running great well there's your answer!
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Unread 01-26-2010, 06:49 PM   #4
BinghamtonCJ5
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about the 304 I cant realy tell you but I will say that my buddy and I have verry similar jeeps both with AMC 360's and T-18's with granny gear and the same gearing in the axles the only differances are that he has lockers in both axles I dont have any, he is running 37 x 12.5 and I am running 35 x 12.5 and he has the 4 barrel, I think it is a 750, I have a stock autolite 2 barrel and he gets allmost twice the fuel millage that I get. So I would say 4 barrel for sure, I know I am looking at that being my next buy for my Jeep.
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Unread 01-26-2010, 07:33 PM   #5
SonicR1
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I was just thinking, it's only the 304, does it realy need to breath that much... maybe i'll compare... I was planning on selling one or the other to fund the build, but maybe I will hold off.
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Unread 01-26-2010, 07:57 PM   #6
rockslide
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Quote:
Originally Posted by sonicr1 View Post
Just bought this thing and it has a 2 barrel on it, but came with Holley 4 barrel and edelbrock manifold for it. Is there enough differance for me to throw the 4 barrel on???

Thanks-Bill
If the intake is a preformance manifold. OK if its a torquer it's not worth the effort.
I have one with a 4 barrel on a 360. I like the 4 barrel fine just not the torquer.
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Unread 01-26-2010, 08:01 PM   #7
texasimport
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My newly rebuilt 304 got its final tune up today. . . .it runs sweet, Holley 670TA, 40 over, balanced, torquer cam, valve springs, performer intake, edelbrock shorties. Now we get to do suspension. . . . . .can't wait.

Put a 4 barrel on it. . . . . .
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Unread 01-26-2010, 08:02 PM   #8
AFjeepMan
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I had a 327 with a 4 barrel and it ram like a champ with an edelbrock manifold! Is your manifold for the 4 barrel a performer or performer rpm by chance? If it's the rpm there is no doubt in my mind that the 4 barrel would work better
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 01-26-2010, 08:21 PM   #9
alex211
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A 750 is way to much carb for a 304, 600cfm is perfect. I have a 600cfm edelbrock on my 78 F-250 with a 351 cleveland. It runs nice and gets 10 mpg.
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Unread 01-26-2010, 09:15 PM   #10
AFjeepMan
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Quote:
Originally Posted by alex211 View Post
A 750 is way to much carb for a 304, 600cfm is perfect. I have a 600cfm edelbrock on my 78 F-250 with a 351 cleveland. It runs nice and gets 10 mpg.
I agree that a 600 is perfect, but if he's running a dual plane intake there is vertually no such thing as "too much carb". The air doesn't die the way it can entering a single plane manifold if you run a carb that has too much flow.
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 01-26-2010, 09:22 PM   #11
alex211
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He probably lost some low end torque with that 750 though. The 750 would be perfect for a 401.
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Unread 01-26-2010, 09:47 PM   #12
AFjeepMan
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yeah or something like a 350 or 383 with the right duration and lift in the cam.
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 01-27-2010, 01:13 AM   #13
jeepdaddy2000
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If the 750 has mechanical secondaries, dump it. It is too big and is designed for high RPM use.
That being said, a properly tuned, vacuum secondary, four barrel of the proper size will almost always out perform a comparable two barrel. This is because the primaries are generally smaller on the 4 bbl. This gives better low end power and economy while the secondaries can be enriched for more power under WOT and high RPM situations. 500CFM should be about right for a 304 running under 5000RPM's.
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Unread 01-27-2010, 02:28 AM   #14
Death_Eagle_571
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I was thinking about switching out my Edelbrock Performer 600 for a Holley Truck Avenger 470, I'm guessing this would be a good switch, or should i get the TA 670 so I could have alittle legroom incase I wanted to swap in an AMC360 in the future?
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Unread 01-27-2010, 04:50 AM   #15
BinghamtonCJ5
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To all that have responded, I will say that neither of the 360's are stock, the one with the 4 barrel I know is 60 over and I believe crank and cam have been changed, the carb does have the small front two barrels. And I am not trying to sway anyone from a 600, I myself am looking at a 600, I was just giving a kind of apples to apples comarison from two like vehicles so that he could go on that.
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