What do I need to change my 2 barrel to a 4 barrel

You pretty much have it. A manifold(or adapter plate) to fit your carb and a 4bbl carb. A gasket set of course.

Make sure that your linkage will match up appropriately.

Nothing to it.

JW

Some gaskets need RTV in the corners, not sure about those but it is handy to have.

I think you will need headers and maybe dual exhaust as well. The last

4 bbl swap I helped a friend do turned it into a pig because of stock exhaust manifolds and single pipe. It only sounded cool. We changed it back.

Mike

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Yeah, with the appropriate 4-bbl intake manifold, and the right gaskets, all that's left is the linkage hookup, and that isn't much more than a bit of fussing. Be alert to the possible need for a new air cleaner assembly to fit the 4-bbl throat.

Thanks JW I have the gaskets,I was wondering if I would have to change the linkage or springs.The 318 never did come with a 4bbl carb,so the linkage has me a little worried.

Thanks I have a new chrome air cleaner kit that I will be installing along with new chrome valve covers.

malbern

I already have duel exhaust, I was told that headers for my C-body are hard to fine. I have been looking but can't seem to get any for my 1970 C-body.

Probably not.... I did an exchange on a 63 galaxy... from a 2 barrel to a 4 barrel. I used an Edelbrock high rise manifold with a Holley 4 barrel (650 cfm) and (I believe) an adapter for the carb. It may have already come with the kit though... that was many years ago... let me tell you...... it made an extreme amount of difference in the cars performance. I was literally shocked at how much power I got just from that small change. You may want to talk to the place you got the parts from to see if you are missing something

Good Luck...

Fwed

You don't say if you're running an A/T or M/T.

An A/T will require additional linkage for the "Kickdown" and adjustment of this linkage.

Dave

Hi Dave it is Auto/T when I got the carb I told them it was for a 318 mopar.I guess I will fine out when I take it apart and reinstall.

It's not so much the carb as it is the linkage. Check out how the linkage is setup on the 2bbl and see if you can adapt to the 4bbl.

two more barrels:--)

look here,

mho v=83e

-You'll need the manifold- you've got that.

-You'll need an air cleaner. One that fits under the hood and clears all the linkages. Aftermarket open element units are available, but they're noisy. I prefer to junkyard dive for OEM type air cleaners.

-You'll need a transmission kickdown linkage (I'd get the complete assembly, including throttle cable and the bracket that mounts to the manifold. A good donor is a 4-bbl Diplomat or Gran Fury copcar. Failing that, you can get a Lockar kickdown cable kit.

- You'll need fuel line. Use either a hard line or FUEL INJECTION hose. Do not make a long run out of regular "fuel line" hose sold at part stores- if you're going to run that much rubber line use fuel injection rated hose.

Sure it did. 80s M-body copcars. Or use parts of a 360 4-bbl pickup truck. The 318 and 360 are dimensionally identical, and anything that bolts onto a 360 (above the oil pan, anyway) will bolt on a 318.

Look again:

But you don't NEED headers. A 4-bbl and dual exhaust (don't forget the crossover!) are a nice mild wake-up for a 318. To take full advantage of headers, you'd really need a bigger than stock cam and exhaust port work. Headers won't HURT, but put your money elsewhere first.

All of the above PLUS:

VERY,VERY IMPORTANT!!!!!!

DO NOT DISREGARD!!!!!!

After the install,if you cannot adjust the kickdown linkage properly yourself, tow, do not drive, your car to a transmission shop and have them do it. It MUST be adjusted properly.

See also:

for carb tuning information.

You may need a PCV valve for a 4BBL 318, from an early 80's 318 4BBL cop car.(maybe a different hose also)

How about the choke? Is it electric? If so, don't tap into the ignition coil to drive it. (A common mistake.)

Speaking of which, convert to an electronic ignition if you can afford it.

Here's some wiring info:

(I2 is start, I1 is run) Junkyard parts will be cheaper.

(control box, wiring harness, coil and distributor )

use a new ballast resistor

Does the old carb have an idle solenoid for A/C? You may need to do a little rigging for that.

Make sure all the old vacuum lines are connected to the proper vacuum types, i.e. ported or direct.

A can of carb cleaner to check for vacuum leaks.

New thermostat, housing, gasket and coolant?

If possible, use washers under the manifold to head bolts if the bolts don't have a flange. Aluminum tears easily.

HTH

For the last, I've found that having an assortment of AN washers around is handy, sometimes manifolds have machined "pockets" for the bolts in which SAE washers won't fit. I like stainless, but always use anti-seize with stainless hardware.

nate

Steve, Wasn't there a 340 cid engine available about that time which was essentially the 318 punched out? Seems that I helped a friend swap a 340 in place of his

318 in a Duster, but may be confused. I know for sure he installed a 4 barrel on it.

With all the modifications he eventually performed, this project evolved to a monster. He could lift the front wheels off the ground - seriously- in low gear.

Im going to answer my own post. Researched it and found the 340 Dodge was available around the OPs model date. It was rated at 275 BHP and with a little tweaking could put out a lot more than that. I believe that manifolds, and many other parts interchange with the 318.

And 290 BHP.

Original intake and exhaust manifolds are rarer than hens teeth, (read, pricey). Yes, parts will interchange, the intake manifold will fit but there will be a severe port mis-match, exhaust manifolds off of a

71-72 C-body 360 will fit the 318 and flow a lot better than the 318 manifolds. 360 "J" heads flow as well as the 340 heads and are still found in salvage yards, one needs to be careful with them on a 318 WRT valve size, too big of valve and you have shrouding problems with the cylinder wall.

And no, the 340 wasn't a punched out 318 any more than a Chebby

350 is/was a punched out 265.