Carb. Recommondation

[tmef]

Hi, Here is what I am running. 360 with KB 190 pistons, 484" MP cam, 2.02 J heads. Should come out to around 10:1 comp. It is going in a '74 shortbed truck with an A-833 4 speed with 3.55 gears. I haven't picked out a carb or intake yet. I was leaning towards the MP-1 daul plane or maybe giving the Air Gap a try. Any carb. suggestions? Thanks, Todd

[ChristianCuda]

The M1 dual plane is a good choice. The air gap I have heard that people are having a hard time getting them.

Christian

[tmef]

Yea, I just got off the phone with Mancini and the guy told me Edelbrck has pushed the Air Gap back to the end of May. Oh well. If I go with a Holley it will probably be a 650 or 700 DP. What I would like to know is anyones opinon on the 750 cfm Edelbrock Performer carburetor or the 625cfm Carter AFB carburertor on my application. Thanks again.

[mopartodd]

the carter will work ok for street and off-road use. if you think your going to be turning high rpm's go with the 750, it will yeild a little more power top end. good luck.

[Dart]

The flow numbers for the Carter are calculated differently that the Holley. You will always get better straight line performance from the Holley. If you use the same type of calculation for the Carter it is a lot lower on flow.

The 650 DP would work good with your combo. You could even go 750 vac sec if you wanted. I am running the 750 vac sec in my 10 to 1 360.

The M-1 dual plane is basically a stock 340 manifold. The M-1 single plane is a better piece for you combo.

[tmef]

I was originally planning on using a single plane intake but the guy doing my machine work (who is very knowledgable in performance engines) pushed me towards a dual plane. I know people run even milder combos with single planes and have good results. I guess I am kinda on the bubble and could go either way and each would have its own benfit.

[Maxwedge]

I agree with Ram1500 on the carb suggestion
especially if you plan on reving it high. If you plan on off roading it and keeping the motor over 3-4k consistantly then I would suggest a single plane intake. If the truck is only going to hit the upper half of the RPM band occasionally then I would go with a dual plane.Dual planes good for street crusing adn lower rpm-single plane is good for continual higher rpm range..
my.02
Wedge

[DusterDave]

On the street, appearance is crucial. Forget performance, it's illegal to exceed the posted speed limits anyway. So, I say go for the full-on drag race look. A pair of Holley 1150 HP Dominators sitting on a fabricated sheetmetal intake would look totally killer, and your truck would attract crowds like you wouldn't believe. Sure, your part throttle response would take a nosedive, but its the image we're talkin' about. And chicks really dig a tunnel ram!

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1973 Duster Pro Street
446 Roller Motor/727

[340king]

Dave, I like your suggestion. There was a Hogan sheetmetal intake for a smallblock W-2 engine on E-Bay recently and I almost bought it. The engine it was going on could probably have used most of it though. But you are right, it would have looked killer on the street.

As for the carb and intake selection, how do you plan to use this truck? I haven't seen what your plans are. I have and am running mild engines with up to 790 cfm mech secondary carbs. You can create a bog situation, especially without a convertor to flash. You may want to stay on the smaller side to avoid this.

You can use a single plane intake with good results on the street. Your driving style may require some adjustment to avoid creating potential bog situations with the 4 gear. The compression appears to be high enough to carry a single plane on that lite of a vehicle. The 360's love a large plenum to feed off of.

[DusterDave]

Hey 340king,
I wasn't serious at all with my suggestion! I was just injecting a little light-hearted humor into the thread! tmef's 360 would fall flat on it's face with two 1150 Dominators! Also, I'm into performance as much as the next guy. And the posted speed limits can take a flyin' leap! Lastly, most girls wouldn't know a tunnel ram from a, well, you fill in the rest! I'll be more careful with my twisted humor next time!



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1973 Duster Pro Street
446 Roller Motor/727

[djswwg]

I'd use a 750 Holley vac. sec. and a Holley Dominator manifold. Holleys always outperform the Carter carbs and because they are modular in design parts are easier to get from other Holleys if you run into a problem. Also tuning for performance is easier to do because things like jets, power valves, accelerater pump cams etc. are so readily available. Nothing wrong with a double pump either,if you dont mind the extra cost and it will work great with the 4- speed set up. As a rule a 750 holley will outperform an 850 Thermoquad (or thermobog as we like to say).

[tmef]

Hi All, Thanks for the input. This is a 2 wheel drive truck that is not onging to be a daily driver. So economy and drivability are not great concerns. I just want kind of a quick street truck that will see the race track every now and then. Thanks again.

[origcharger]

I really like my air gap manifold on my 383.