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got a 340 intake for my 318 RR...what next?
#886571
12/23/10 03:36 PM
12/23/10 03:36 PM
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Joined: Jan 2009
Posts: 124
Pittsburgh, PA
bigdaddywiz
OP
member
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OP
member
Joined: Jan 2009
Posts: 124
Pittsburgh, PA
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I've been looking to do this for a while now and finally over the summer I came across an intake, 4bbl and air cleaner off a 340 (stamps showing its off a '72) for my 73 Road Runner with a 318 2bbl.
Now I know people are going to say why not just do an engine swap?...well, i don't have the cash to change out the transmission and rear end to handle much more power let along find an entire engine as well. I know this isn't going to make my car a fire breather or anything, I just want a little more pep, and something to do over the winter while its in the garage.
Can anyone offer any pointers for this project? I know the carb will need rebuilt, but didn't know if i had to re-jet or anything like that since this will no longer be on a 340 block. Also, what gasket kit will I need to get? This will be be my first engine project, but I wouldn't consider myself a total noob.
right now, the only thing done to the car is straight pipes with classic series flowmasters. stock headers, but i do have what looks to be aftermarket headers that my dad had lying around his garage. don't know if they will work, but I'm sure I'd probably want to add those on later if they do.
any pointers for this would really be appreciated!
Thank you.
Last edited by bigdaddywiz; 12/23/10 04:00 PM.
73 Road Runner
09 Challenger R/T
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Re: got a 340 intake for my 318 RR...what next?
[Re: bigdaddywiz]
#886572
12/23/10 03:51 PM
12/23/10 03:51 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Back in the 70's I helped a buddy add a 70 340 intake, a Holley 600 & some Hedman headers to his 318/3spd Duster.. That car spanked some stuff it had no business running with... Like a 396 Chevelle & a 68 Camaro with a hotrodded 350 & gears..
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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Re: got a 340 intake for my 318 RR...what next?
[Re: bigdaddywiz]
#886574
12/23/10 05:30 PM
12/23/10 05:30 PM
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Joined: Feb 2009
Posts: 2,034
NW Indiana
deansrr
top fuel
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top fuel
Joined: Feb 2009
Posts: 2,034
NW Indiana
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pretty easy change over, as stated above good gasket set, how do you know the carb needs rebuilt? what kind of carb?
Last edited by deansrr; 12/23/10 05:30 PM.
1973 Road Runner
1974 Satellite (for sale)
1973 240z (wifes)
1993 Ramcharger (thanks Devil)
2002 Honda S2000
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Re: got a 340 intake for my 318 RR...what next?
[Re: MoparforLife]
#886575
12/23/10 05:33 PM
12/23/10 05:33 PM
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Joined: Jun 2004
Posts: 3,319
Chicago Burbs
sthemi
master
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master
Joined: Jun 2004
Posts: 3,319
Chicago Burbs
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I will assume you are replacing the tiny two barrel on the 318. You will have to buy or fabricate the throttle bracket, since the original is in the wrong place., and if you are running an automatic, some tweeking of the kick down linkeage will be needed. As far as the carb, it should be in the ballpark as far as jetting, the factory jetted them lean to begin with, for emmisions... Just plan more fuel stops ! Not that the carb will burn more fuel, just your foot will be listening to the music more often !  
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Re: got a 340 intake for my 318 RR...what next?
[Re: sthemi]
#886576
12/23/10 05:42 PM
12/23/10 05:42 PM
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Joined: Jan 2009
Posts: 124
Pittsburgh, PA
bigdaddywiz
OP
member
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OP
member
Joined: Jan 2009
Posts: 124
Pittsburgh, PA
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Quote:
I will assume you are replacing the tiny two barrel on the 318.
You will have to buy or fabricate the throttle bracket, since the original is in the wrong place., and if you are running an automatic, some tweeking of the kick down linkeage will be needed.
As far as the carb, it should be in the ballpark as far as jetting, the factory jetted them lean to begin with, for emmisions...
Just plan more fuel stops ! Not that the carb will burn more fuel, just your foot will be listening to the music more often !
yeah i'm replacing the 2bbl carb with the 4bbl that came with the intake, so its whatever came on a 340 in 1972. I'm pretty sure it needs rebuilt cause it was sitting in this guys garage for a long time and everything seems dry rotted, like its been sitting for 20 years or so.
about the bracket that i'll need for the throttle linkage and kick down...it looks like it was attached to the carb. i'm not looking at it at this very moment, but i think it was all there. will i still need to fabricate or will the 340's linkage and brackets work?
Last edited by bigdaddywiz; 12/23/10 05:44 PM.
73 Road Runner
09 Challenger R/T
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Re: got a 340 intake for my 318 RR...what next?
[Re: pinkduster]
#886579
12/23/10 09:32 PM
12/23/10 09:32 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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it is very important to have the throttle pressure valve linkage to save the tranz from burning up a 2-v linkage can be mod o fried to work with very little work if it has a flat rod from bracket to the carb stud you can bolt 2 of those together to make it longer from the bell crank to carb stud if its round threded rod you can cut and weld a piece in to make it longer and still be adjustable usally needs 1" to 1.5" added to the linkage to be long enuff I also bend in a slight s curve to aline it up to the carn stud it needs to move freely with out the carb lever and the spring pull it back with out open the throttle stock 4-v linkage would be ideal,IIRC it would be the 3 rod style for A-body it will be a boost in performance even with the 2-v wimpy cam in the 318 4-v and headers will wake it up some,cam swap later to gain some more performance done this swap many times over the yrs  should be a thermo bog on that 340,I would have it rebuilt or go with another carb,they can be pricey and feniky to get right for a first timer 600cfm eddie carb works great on them,IMO here is the 88 360 headed 318 4-v cop engine in my stepside 600 eddie carb LD4B intake lunati voodoo roller cam headers deul 2.5 pipes a999 HS/LU tranz 8 3/4 with 3.23 gears runs strong and knocks back 19 mpgs daily driveing
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Re: got a 340 intake for my 318 RR...what next?
[Re: scratchnfotraction]
#886580
12/23/10 09:50 PM
12/23/10 09:50 PM
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Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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If your kickdown rod is the round threaded kind, the 2bbl version will be too short to reach the carb as said above. Edelbrock sells a cheap threaded extension a couple inches long to correct this problem. Summit sells them, they come in two different diameters depending on which diameter threaded kickdown rod you have. You will be happy with the upgrade. The Thermoquad spread bore carb you probably have will have an agressive sucking sound when you crack the secondaries open! You may not have to re-jet the carb, just clean up and re-gasket if you are half lucky.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: got a 340 intake for my 318 RR...what next?
[Re: 1_WILD_RT]
#886581
12/23/10 10:01 PM
12/23/10 10:01 PM
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Joined: Dec 2010
Posts: 70
very Southern Indiana
skullbucket
member
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member
Joined: Dec 2010
Posts: 70
very Southern Indiana
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Quote:
Back in the 70's I helped a buddy add a 70 340 intake, a Holley 600 & some Hedman headers to his 318/3spd Duster.. That car spanked some stuff it had no business running with... Like a 396 Chevelle & a 68 Camaro with a hotrodded 350 & gears..
Uh well..... uh..... yea....
Here here have some more eggnog, I'll know when you had enough when the 318 whipped on an L-88 vette also!!!!
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Re: got a 340 intake for my 318 RR...what next?
[Re: skullbucket]
#886582
12/23/10 10:37 PM
12/23/10 10:37 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
Quote:
Back in the 70's I helped a buddy add a 70 340 intake, a Holley 600 & some Hedman headers to his 318/3spd Duster.. That car spanked some stuff it had no business running with... Like a 396 Chevelle & a 68 Camaro with a hotrodded 350 & gears..
Uh well..... uh..... yea....
Here here have some more eggnog, I'll know when you had enough when the 318 whipped on an L-88 vette also!!!!
Believe what you want... I was there... To be honest I was completely shocked too...
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Re: got a 340 intake for my 318 RR...what next?
[Re: skullbucket]
#886585
12/24/10 03:24 AM
12/24/10 03:24 AM
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Joined: Dec 2008
Posts: 2,782
USA
JoesMopar
master
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master
Joined: Dec 2008
Posts: 2,782
USA
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Quote:
Quote:
Back in the 70's I helped a buddy add a 70 340 intake, a Holley 600 & some Hedman headers to his 318/3spd Duster.. That car spanked some stuff it had no business running with... Like a 396 Chevelle & a 68 Camaro with a hotrodded 350 & gears..
Uh well..... uh..... yea....
Here here have some more eggnog, I'll know when you had enough when the 318 whipped on an L-88 vette also!!!!
Haven't even been a member for 2 weeks yet and already bashing people you don't know? Nice..... 
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Re: got a 340 intake for my 318 RR...what next?
[Re: DaytonaTurbo]
#886589
12/24/10 11:39 AM
12/24/10 11:39 AM
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Joined: Aug 2007
Posts: 2,754
Conway, SC
T2R9
master
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master
Joined: Aug 2007
Posts: 2,754
Conway, SC
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Quote:
If you can swing an intake change, can you swing a little more for a cam change? The summit k6901 cam/lifter kit is only 110 bucks and I'm sure someone on here can suggest a set of valve springs. Add in a set of aftermarket headsers and you'll really wake that 318 up a lot more than just doing the intake.
I have run this cam on two different 318's with stock springs with no problems up to 5500 rpm. My 76 Feather Duster with this cam, a 72 340 TQ and duel exhaust was a screamer! The 4-speed and 3.55 gears helped too!
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Re: got a 340 intake for my 318 RR...what next?
[Re: rattler]
#886590
12/24/10 11:44 AM
12/24/10 11:44 AM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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if you have the 4-v 340 linkage use it it basicly the same from the intake bracket down to the tranz the longer piece will be from the bracket to carb rod you can mod the 2-v linkage to work with ease,just ask on here when you ready to do it see if you can post pics of whats on the car now and what peices you have from the 340 I have a few pieces that might help you get it done..they are free so it should be cheap for you to get it right sounds harder than it is,but its one of the most important pieces on the car for tranz longevity and working correctly on the shifts if you go junyarding any of the mid 80s 4-v cars F-R bodys( 5th aves-gran furys) would have a set up to use also..as long as its a 3 piece...just get all of it some of the mopars use a one piece rod also,but it goes by body style when I did my truck to stock q-jet,I just got the intake carb linkage all the way to tranz when I went to LD4B and eddie carb stock linkage worked there are some aftermarket cable set ups that are good also(bouchillon/lokar) lets see what you got 
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