318 4-barrel from the factory?

[Micmaynard]

I saw some pictures of air cleaner decals that showed "318 Four-Barrel"
Did Chrysler make these? if so, when?

 

[Vaanth]

I saw some pictures of air cleaner decals that showed "318 Four-Barrel"
Did Chrysler make these? if so, when?

That decal is an aftermarket decal patterned after the originals for other engines, and reproductions based on the original versions. Originally used in 1973-1974 on 340 (73), 360 high performance (74), 400 high performance, and 440 high performance. Except for earlier export versions, the 318 LA engine was first equipped with a four barrel in 1978, but did not have that decal.

The reproductions are popularly used on other year models. I've used them myself on several 360, 400, and 440 vehicles. Here's a couple on my Newport 360, and Fury 400:

Edit: The 1958-1963 318 A engine (Poly) could be equipped with a four barrel carburetor, but did not use the decal either.

 

[71Polara383]

The answer is yes they did but I'm not sure the engines had that call out.

@saforwardlook has a wealth of knowledge on the 318-4 and what it was designed for and why it exists

 

[Micmaynard]

That decal is an aftermarket decal patterned after the originals for other engines, and reproductions based on the original versions. Originally used in 1973-1974 on 340 (73), 360 high performance (74), 400 high performance, and 440 high performance. Except for earlier export versions, the 318 LA engine was first equipped with a four barrel in 1978, but did not have that decal.

The reproductions are popularly used on other year models. I've used them myself on several 360, 400, and 440 vehicles. Here's a couple on my Newport 360, and Fury 400:
View attachment 704259
View attachment 704260

That's what I expected, why would they put a cool-guy decal on a 318. Although when I'm done tweaking on my 318, I'll probably find one of those decals. Nice finishing touch.

 

[Mr C]

The call out decal was not an original Chrysler Corp thing.

The 318 4 bbl was made by Chrysler Corp...engine code E46. As mentioned it started out in the late 70's as an option. Often seen in M bodies.

 

[CBODY67]

I saw some pictures of air cleaner decals that showed "318 Four-Barrel"
Did Chrysler make these? if so, when?
View attachment 704237

Easy to take an existing decal and change the displacement numbers,

On the later LA318s, the "four barrel" was an emissions-version Thermo-Quad. Initially many were for "High-Altitude Emissions", but were expanded in later years.

Rather than to brag about a 318 4bbl, might it be better to let everybody think it's a 360?

CBODY67

 

[Micmaynard]

Interesting information... thank you.
I don't mind being an "imposter" with a tweaked 318, but I don't want to get caught telling folks it's a 360. I might get chased out of the cars and coffee for that sort of thing. ;)

 

[marko]

318 4vs were also available in 1978 to 1982 on cordobas & 80 to 82 dodge miradas ( ive had several) as well as the downsized 79 to 81 st regis, new yorker etc

 

[polarus]

I had a 77 Dodge Aspen R/T with a 318 4 bbl., no air cleaner decal.

 

[Toolmanmike]

318 4 barrels in cop cars as well. M Bodies if I remember correctly. No aftermarket stickers on the air cleaner though. They ran 360 heads.

 

[Vaanth]

FYI...​

​

A Carter Thermo-Quad and Rochester Quadrajet Model Listing for Chrysler 318 Engines​

---

Author: Gary Lewallen (aka Vaanth)

Version: 1.0_draft
Date: 31 January 2025
© 2025 Gary Lewallen

---

Introduction​

This document lists the Carter Thermo-Quad and Rochester Quadrajet four barrel carburetors originally equipped on Chrysler products 318 cubic inch engines in 1974 and 1978-1989. This information excerpted from A Carter Thermo-Quad Guide, Version 3.1.

Numeric Listings Notes​

The following model listings are in order by model number. The listing identifies the models by primary application and year model. Unless otherwise specified, applications are Chrysler built cars. Some variation in date availability, multiple application models and differences in production runs might occur. Abbreviations are used to highlight specific features, particularly with California and Federal based emissions, and some major emission subsystems.

Jet and metering rod information is included as was documented by Carter and Chrysler. All primary and secondary jets are prefixed with 120- for Thermo-Quads. All metering rods are prefixed with 75- for 1972 and later OEM and 9000 series. Competition Series and 1971 Thermo-Quad rods are prefixed with 16-. The prefixes are omitted from the listing to save space.

The 'Kit' field contains a code number corresponding to a column code for the carburetor kits listed in A Carter Thermo-Quad Guide, Version 3.1.

The model number ‘S’ or ‘SA’ suffix has been omitted for brevity.

Numeric Listings Abbreviations​

Following are abbreviations used in the Numeric Listings in this document.

• AT = Automatic Transmission
• MT = Manual Transmission ( No reference means both transmissions )
• Pri. = Primary Jet
• Sec. = Secondary Jet
• Rod = Primary metering rod
• Bore = Primary throttle plate diameter in inches, All secondaries are 2-1/4"
• HP = High Performance
• CA = California application; generic for CA, N95
• Fed = Federal application ( No reference means both Federal and California.)
• Can = Canada application. Typically, Canada used Federal carburetors except as noted.
• Exp = Export
• AU = Australia
• Mex = Mexico
• LD = Light Duty Cycle
• MD = Medium Duty Cycle
• HD = Heavy Duty Cycle
• LRT = Li’l Red Express Truck
• MH = Motorhome
• LB = Electronic Lean Burn or ESA. Noted on 1976 models. After 1976, most Federal cars were LB equipped (N92, N94).
• IE = Idle Enrichment
• Alc = Altitude Compensator; (N96).
• HA = High Altitude; Can include Alc, or just revised jetting, et. al.
• BV = Bowl Vent valve
• O2 = Oxygen feedback solenoid
• CN = Application listed, but production canceled after application specified.
• NR = Application listed, but not released in production after application specified.
• NB = Application listed, but not built after application specified.

NOTE: N92, N94, N95, N96 are Chrysler sales/production codes for air/emissions packages.

Thermo-Quad Numeric Listing​

Model	Application	Details	Pri.	Sec.	Rod	Bore	Kit
9000	74 318	Exp (3751474)	4098	5137	1966	1-3/8	1
9123	78 318 Truck	MT CA (4095427)	4092	5110	1997	1-3/8	3
9124	78 318 Truck	AT BV CA (4095428)	4092	5110	1997	1-3/8	3
9137	78 318	AT Can Exp (4041858)	4092	5110	1998	1-3/8	3
9147	78 318	AT CA (4041865)	4092	5110	1996	1-3/8	3
9152	78 318 Truck	AT LD Can (4095447)	4092	5110	1997	1-3/8	3
9183	78-79 318 Truck	BV (4104483)	4092	5110	1997	1-3/8	3
9185	78-79 318 Truck	BV (4104484)	4092	5110	1997	1-3/8	3
9187	78-79 318 Truck	BV (4104489)	4092	5110	1997	1-3/8	3
9195	79 318	AT CA IE BV (4095934)	4092	5110	1938	1-3/8	3
9215	78 318 Truck	MT BV (4173309)	4092	5110	1997	1-3/8	3
9216	78-79 318 Truck	AT BV (4173310)	4092	5110	1997	1-3/8	3
9222	78-79 318 Truck	MT BV Fed (4104495) CN	4098	5110	1997	1-3/8	3
9223	78-79 318 Truck	AT BV CA (4104496)	4097	5110	2145	1-3/8	3
9227	78-79 318 Truck	AT Can BV (4104500)	4092	5110	1997	1-3/8	3
9228	78-79 318 Truck	MT CA BV (4173330)	4092	5110	1996	1-3/8	3
9229	78-79 318 Truck	AT CA BV (4173331)	4092	5110	1996	1-3/8	3
9230	80 318	AT Can Exp BV (4179033) CN	4092	5110	2278	1-3/8	3
9232	80 318	AT Can BV (4179035) CN	4092	5110	2278	1-3/8	3
9234	80 318	AT Fed BV O2 (4179037)	4093	5110	1950	1-3/8	3
9243	80 318	AT Can Exp BV (4179043)	4095	5110	2000	1-3/8	3
9245	79 318	AT CA BV (4095495)	4092	5110	2278	1-3/8	3
9254	80 318 Truck	CA BV (5214810)	4093	5110	1996	1-3/8	3
9256	79 318	AT Fed Alc (4095979)	4092	5110	2005	1-3/8	3
9269	78-79 318 Truck	AT CA BV (4173361)	4092	5110	1996	1-3/8	3
9270	78-79 318 Truck	AT CA BV (4173362)	4095	5110	2145	1-3/8	3
9271	78-79 318 Truck	AT Can BV (4173363)	4092	5110	1997	1-3/8	3
9279	80 318 Truck	BV (5214823)	4098	5125	2005	1-3/8	3
9283	81 318	AT BV Fed (4179132)	4096	5110	2360	1-3/8	3
9284	81 318	AT BV Can Exp (4179133)	4095	5110	2014	1-3/8	3
9288	80 318 Truck	LD AT Can (5214834)	4092	5110	1996	1-3/8	3
9293	81 318	AT BV O2 Fed (4179145)	4096	5110	2360	1-3/8	3
9295	80 318	AT BV Fed Alc (4179051) CN	4092	5110	1996	1-3/8	3
9296	80 318 Truck	MD HD CA BV (5214840)	4092	5110	1996	1-3/8	3
9306	80 318	AT O2 BV Exp	4092	5110	2278	1-3/8	3
9311	81 318	Truck LD AT Fed (4213731)	4097	5110	2359	1-3/8	3
9320	80 318	O2 BV	4096	5110	2340	1-3/8	3
9329	81-82 318 Truck	LD CA AT (4213743)	4097	5110	2359	1-3/8	3
9330	81-83 318 Truck	LD CA MT (4213744)	4097	5110	2359	1-3/8	3
9341	83 318 Truck	LD (4287012) CN	4098	5110	2359	1-3/8	3
9342	82 318 Truck	Fed BV (4287013)	4097	5110	2359	1-3/8	3
9357	81-83 318 Truck	MD HD (4213745)	4098	5110	2005	1-3/8	3
9364	81-84 318	AT Can BV O2 (4179177)	4095	5110	2014	1-3/8	3
9365	83 318 Truck	AT LD (4213703)	4097	5110	2359	1-3/8	3
9367	81 318 Truck	MT LD (4213706)	4097	5110	2359	1-3/8	3
9368	81 318 Truck	AT LD BV CA (4213707)	4097	5110	2359	1-3/8	3
9371	81 318 Truck	MD HD BV Fed (4213713)	4096	5110	2005	1-3/8	3
9372	81-82 318	AT Fed BV O2 (4179179)	4096	5110	2360	1-3/8	3
9373	81 318	AT CA BV O2 (4179180)	4096	5110	2360	1-3/8	3
9374	82-83 318	Fed HA BV O2 (4227251)	4096	5110	2382	1-3/8	3
9375	82 318 Truck	Fed CA Can BV (4241752)	4098	5110	2005	1-3/8	3
9385	82-83 318	Fed BV O2 (4287051)	4096	5110	2360	1-3/8	3
9388	83 318	AT BV O2	4096	5110	2360	1-3/8	3
9389	84 318	AT BV O2 (4300012)	4092	5110	1965	1-3/8	3
9391	84 318	AT BV O2 HA (4300019)	4093	5110	2144	1-3/8	3

Quadrajet Numeric Listing​

Carter ceased production of the Thermo-Quad after the 1984 model year. Chrysler switched to the Rochester Quadrajet M4ME and E4ME for 1985-1989. Following is a listing of these carburetors.

Rochester Number	Application	Details
17085407	85-87 318	E4ME feedback unit, (4306407)
17085411	85 318	Can, Exp, (4306411)
17085433	86-89 318	Fed, CA, Can, E4ME feedback unit, (4306433)

For more information, see A Carter Thermo-Quad Guide, Version 3.1.

---

End Of File

---

 

[saforwardlook]

The answer is yes they did but I'm not sure the engines had that call out.

@saforwardlook has a wealth of knowledge on the 318-4 and what it was designed for and why it exists

The 318-4 bbl package was introduced in 1978 for California vehicles with 318 engines. The guys at the Chrysler proving grounds in Michigan were the ones who released final emission calibrations at that time, and they only introduced 2 bbl 318 engines for California that ran like crap, so bad that the California Air Resources Board recalled them because those cars could not follow the dynamometer driving trace during the official test cycle because of multiple pass outs from a cold start. I got the assignment to fix the problems but I was not allowed to touch the 2 bbl. package. So I told my boss that I wanted to do a complete calibration because I knew how to make them drive flawlessly when the proving grounds did not, so my boss said I could make a 4 bbl. package. The production version for California ran flawlessly but there was one thing I wasn't allowed to do - the chief engineer said I had to use the 360-4 intake manifold because they could not afford to redesign a 4 bbl. intake manifold with smaller runners that I wanted in order to improve low end torque. The cars did indeed run with no driveability issues but the Highway Patrol wanted more low end grunt, but couldn't get it due to corporate cost issues. At least those cars ran without driveability issues though and passed emission tests easily. That's the short version......................Steve

 

[Love Shack]

I bought my 79 road runner new, and still have it. All original with the 318-4, California emissions. $6404. It still runs flawlessly, Lean Burn and all. If I stay out of the secondaries, I get 20 mpg on long highway trips. Love my Time Machine !

 

[Love Shack]

It didn’t come with that Coyote Duster pie tin either, but I think it looks just right. As soon as the warranty was up, the air pump and associated plumbing was removed and put in a box.