Changing a 304 intake manifold and carb - JeepForum.com

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post #1 of 33 Old 12-22-2013, 04:20 PM Thread Starter
mopar440cu
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Changing a 304 intake manifold and carb

Can any of you suggest a good performance manifold and carb set up for my stock 304? I am sure edelbrock has a performer, but I really dislike their carbs. I am a Holley man. I am thinking a descent combo for this stock motor might be a dual intake manifold and possible 500 something 4 barrel. What do you all think? I don't really want to go crazy and put a cam, lifters and such in this, because if I was going that route I would just put my 540 stroker wedge block and 727 in it. Hmmm maybe down the road..

Let me know your thoughts!!

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post #2 of 33 Old 12-22-2013, 07:58 PM
holliewood61
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I just did a edelbrock performer intake with a holley 600. I did go ahead and throw a mild cam in it while I was at it. so far it seems to be working well. had I not bought the carb and intake together second hand I would of went with the holley truck avenger 570.
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post #3 of 33 Old 12-22-2013, 11:50 PM
RedNeckCorvette
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I am running an Edelbrock 'Performer Manifold' with a Holley Truck Avenger 470 / four barrel on my AMC 304, I can't say enough about the improvements involving off road lean angles. You have to go fuel injected to better this carburetors ability to run off angle. I live out in the woods and can tell you first hand all the street carburetors I have run around the place here in my cj7 have flooded out just backing up or going forward on approach to a steep side hill [every time] just to get out and look the fields over.
They let me down every time I was on a side hill, and I am talking squid turf, nothing changeling at all. Unless you have the time and money to go fully fuel injected there is no better option out there as far as I know. This carb. [ Holley 470 truck avenger] works as well in the woods as it does in the Oregon Sand Dunes. It will do everything you need and then some in that AMC-304
Red Neck
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post #4 of 33 Old 12-23-2013, 02:33 AM
Matt1981CJ7
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Personally, I'd probably do an Offenhauser intake with a Q-jet.

Matt


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post #5 of 33 Old 12-23-2013, 04:09 AM
hutch1200
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Any dual plane intake, and the Holley Truck 470. Easiest "Plug-n-Play". But I do agree w/Matt that a quadrajet might be a better carb, IF, you want to take the time to dial it in correctly. And have a decent working knowledge of carbs. If you aren't in a hurry, hit the swap meets/Ebay/RacingJunk.com etc....get an old E-Brock SP2P intake and a nice Q-jet. Parts and expertise for the Q-jet are still available if not "readily accessible" at most FLAPS.

I've also learned that sometimes... when people don't agree with you .... its best to hold them down and kidney punch them till they agree with you
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post #6 of 33 Old 12-23-2013, 07:33 AM
82JeepCJ7
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Q-jet if you wheel. Everything else is a door stop or for a mall crawler.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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post #7 of 33 Old 12-24-2013, 03:57 AM Thread Starter
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What size qjet??
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post #8 of 33 Old 12-24-2013, 06:47 AM
Matt1981CJ7
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Quote:
Originally Posted by mopar440cu View Post
What size qjet??
I would buy the Level 2 for small block engines from National Carbs.

Matt


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post #9 of 33 Old 12-25-2013, 05:32 AM Thread Starter
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Quote:
Originally Posted by Matt1981CJ7 View Post
I would buy the Level 2 for small block engines from National Carbs.

Matt
Do you know what the cfm is??

The web does not tell you what it is, but it is a very reasonable price.

Thanks,
Steve
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post #10 of 33 Old 12-25-2013, 07:52 AM
Matt1981CJ7
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Originally Posted by mopar440cu View Post
Do you know what the cfm is??
Thanks, Steve
I don't, sorry. My guess would be around 600-650. Give them a call.

The beauty of the the Q-jet is it's small primaries, and large vacuum-actuated secondaries, so you get the best of both worlds...mileage and performance-wise.

Since they operate on engine vacuum, the secondaries only open as much as your engine can handle. That's why the Q-jet was installed on such a wide variety of vehicles, and engines.

Creating a smooth transition between primary and secondary circuits can be a little tricky, but there is a butt-load of info available on this.

Good luck, and let us know what you decide.

Matt


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post #11 of 33 Old 12-25-2013, 08:55 AM
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The 1 3/32 inch primary version is rated at 750 CFM and the 1 7/32 inch primary one is rated at 800. Like Matt said, though, they have an air dam over the secondaries that keeps them from giving the engine more than it can use. Fantastic carb.


Shawn

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post #12 of 33 Old 12-25-2013, 09:01 AM Thread Starter
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Thank you both for that informative response. I appreciate it much.
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post #13 of 33 Old 12-26-2013, 11:50 PM
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My First Q-jet was in my 396 SS-RS rag top- 67 Camaro in 1967. It was the cause of more complications then I care to remember. Here was a stock engine producing 375 HP that could not get off the line. I rebuilt the original carb. and played with it all summer then in the fall spent $125.00 on a new Q- jet [lot of money back then] and never got the results I was looking for, until I replaced it with a Holley. With just a few simple adjustments that carburetor preformed almost flawlessly out of the box, I never looked back. As for mileage - My jeep has had three different carburetors installed on the same manifold. They varied from around 700cfm-650cfm-470cfm. My mileage never changed a bit. My time between shifts changed as the flooded engine 'wile running the larger carburetors' required less time to max out the rpm range.
One of the things I like most about the 470 Holley avenger is its simplicity and the improvement in the useable range of power, provided through proper fuel distribution. My cam shaft is what dames my mileage.
Just say en / Red Neck
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post #14 of 33 Old 12-27-2013, 01:36 AM
dg6772
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With a little imagination you could convert the 304 to tbi. There is an adapter for the intake,the rest can come from a doner car or truck. Truck wiring is easiest to work with. Then hills don't matter or cold starts either. Just a thought......

Dave in Muskegon
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post #15 of 33 Old 12-27-2013, 09:30 AM
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go with the edelbrock, youll never look back. i also like holley but for a trouble free carb that performs good ill stick with edelbrock. every engine ive ever had that sat for a long time, say 6 months or longer, i always had to take out the needle and seats and clean them out or it would flood. i have two engines with 600 edelbrocks and have never, and i mean never, had any problems with them. and they sit without being started for longer than 6 months.
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