Help identifying things. What are these?

[sbailey05]

Original Vehicle: 1979 C10 5.7L 350 VIN Code L with factory A/C, HD Suspension, 4BBL Carb.
(Nothing seems to match the original vehicle parts specs so I need help identifying some things)

Hello! I recently began an unintended project restoring a 1979 Chevy C10 that originally had a 5.7L 350 V8, factory A/C, HD Suspension. I was told the truck had a rebuilt 350 from a newer model TBI truck that was converted back to carb and put in this 1979 but I recently found that not to be true by the casting numbers. I believe the engine is a later 80's model 305 and I can't figure out what year the carb is but I believe it's an M4M or M4MC?. However the previous owner ripped out the compressor and most of the wiring and didn't hook anything back up when the 305 was installed. So... I am looking for a definitive answer on the following as when I buy parts, they are usually similiar but never the right fit and have needed to be returned or slightly modified. My goal is restore the truck as close to factory as I can which means swapping back to a 350 if this is indeed a 305 but while I need to get the current setup road ready to where it will at least pass inspection. Plus if I have to buy a new 350 engine, I'll need a couple months to save so I want this engine to be tuned right and everything working.

Picture 2 is the number off the intake and not the casting number on the back of the block.

Removed: The picture of the engine mount

1. Casting # 14093627: What year engine is this? The Casting numbers to the left and right of the distributor say "GM50LG SGT" and the casting number appears to be 14093627 but I couldn't get a picture. I want to know what year and size engine this is so I can make sure to buy the correct parts. I have narrowed it down to a late 80's model 305 but I could be wrong. I purchased a temperature sending unit for a 1979 5.7 350 and it appears to be the same one used for a 305 throughout the 80's but when I pulled the old one out, the thread fitting was a smaller size so the new one wouldn't fit. Also, the engine has a vacuum/sending unit by the thermostat that isn't connected and a oil pressure switch/sender by the oil filter that isn't connected to anything either. I also found what I believe is an Oxygen Sensor wire that isn't hooked up to anything and I can't get the instrument cluster's temp gauge working. I got the Oil Pressure gauge working but I'm not sure if it's right as the oil pressure tends to run high(close to 60) most of the time the vehicle is running down the road.


2. What year carb is this for? I've narrowed it down to a 4barrel quadrajet but can't figure out the exact year it was made or what year vehicle it came off of.

3. What in the world is this? I found it in the glove box. Was told A/C just needed a compressor. Turns out none of the vacuum lines are connected in the engine bay. Behind the dash, the heater orange hose that has the tee is connected. Heater blows (floor only?) at the same speed no matter what speed the switch is set to or what temperature or even if you turn it off. That tells me it's a vacuum issue but I can't tell from the service manual exactly what this is or where it goes. It doesn't appear to just "fit" on anything already under there.

Thank you for the help! I have wasted so many hours trying to figure these things out and it's a big hassle ordering parts and having to return them several times. This is a project I didn't want or plan on but once I started fixing stuff I decided I'd take it on and do it all the way. So far I've replaced the master cylinder, all the steel brake lines, front and rear hoses, rear drums, shoes, hardware, calipers, tie rods, power steering gear, power steering pump, power steering hoses, all the temperature sending units, speedo cable, and much more so you can imagine my frustration having to return parts or take them back to the store. I finally quit ordering them off rockauto because every one I got was wrong or adaptable but was a struggle to do so.

[LTZ C20]

Welcome. Picture 2 is the casting number or part number for the intake manifold, is that what that is? It looks like the intake. Picture 3 is just a part number for the engine mount bracket that the number is stamped into. Picture 4 is carburetor model info. Picture 5 is a set of wire terminal crimps/cutters and an HVAC door actuator for a much newer vehicle. Those have no place in these trucks, those didn't start getting used until the early 90s. All the HVAC doors on these trucks are operated by vacuum diaphragm actuators.

[sbailey05]

Good. Just when I'd thought I'd figured out what I needed to fix the A/C-Heater vacuum setup, I found that thing and was quite confused.

As far as the first picture, you are correct. It's the number off the intake. I couldn't get a picture of the casting number on the back of the block due to where it was but I was hoping the picture of the intake and the engine casting number would help in identifying it. I really want to know what size engine and what year vehicle it came off since I was originally told this was a 350 engine but I don't believe that to be true.

Yes, I knew that was the carb model info as it helped me narrow down what kind it was. I was hoping to learn what year vehicle carb it was so I can know what mix and match parts I'm dealing with. For example, if they are from all different vehicles and say the engine a 305 from a 1986 model and the carb came off a 1980 model and the original engine is supposed to be a 1979 350, I will end up continuing to buy similiar parts but not the exact ones I need. My 1979 service manual helps quite a bit but the parts tend to be slightly different because they are from a newer year 305 I think.

Do you know what year/make/model that engine casting number or stamp identify to?

Sorry for the confusing questions. I'm literally learning from scratch so everything I've learned is from actually working on the vehicle so the different year parts kind of muddles up my learning of how the entire system works and relates together. All of the parts I've pulled off are either too old for the parts stores to figure out and the part numbers are beyond recognition or non existant. The vehicle was treated ridiculously bad for the last 20 years on old dirt roads. The guy drove it until it wouldn't go forward anymore then got rid of it. He never fixed anything that broke or went out. He just rode it till it wouldn't go anymore. : )

[Irish_Alley]

note: post was edited after LTZ replied. im sitting here like number one in the intake number not number 2. but the carb is a 1980 original 4bbl federal emissions off a chevy might be off a manual trans setup

you need the casting numbers on the drivers side behind the head on top of the bell housing mating surface

[Irish_Alley]

also take a moment to introduce yourself and read up on Welcome to the community

[Pike1915]

That casting number "14093627". Is a small block 87-88 305

[LTZ C20]

Irish, I started with number 2 because number 1 picture didn't seem to be working. But now there seems to be a picture missing or 2. I don't know, what happened?

[Irish_Alley]

no youre good he edited the post after your reply so what was number 2 is now number 1 and number 5 idk

[LTZ C20]

Ok. But there are only 3 pics now, there was 5 when I started. So if I have it right, he removed the engine mount picture and the #1 that wasn't working.

[hatzie]

Original Vehicle: 1979 C10 5.7L 350 VIN Code L with factory A/C, HD Suspension, 4BBL Carb.
(Nothing seems to match the original vehicle parts specs so I need help identifying some things)

Hello! I recently began an unintended project restoring a 1979 Chevy C10 that originally had a 5.7L 350 V8, factory A/C, HD Suspension. I was told the truck had a rebuilt 350 from a newer model TBI truck that was converted back to carb and put in this 1979 but I recently found that not to be true by the casting numbers. I believe the engine is a later 80's model 305 and I can't figure out what year the carb is but I believe it's an M4M or M4MC?. However the previous owner ripped out the compressor and most of the wiring and didn't hook anything back up when the 305 was installed. So... I am looking for a definitive answer on the following as when I buy parts, they are usually similiar but never the right fit and have needed to be returned or slightly modified. My goal is restore the truck as close to factory as I can which means swapping back to a 350 if this is indeed a 305 but while I need to get the current setup road ready to where it will at least pass inspection. Plus if I have to buy a new 350 engine, I'll need a couple months to save so I want this engine to be tuned right and everything working.

Picture 2 is the number off the intake and not the casting number on the back of the block.

Removed: The picture of the engine mount

1. Casting # 14093627: What year engine is this? The Casting numbers to the left and right of the distributor say "GM50LG SGT" and the casting number appears to be 14093627 but I couldn't get a picture. I want to know what year and size engine this is so I can make sure to buy the correct parts. I have narrowed it down to a late 80's model 305 but I could be wrong. I purchased a temperature sending unit for a 1979 5.7 350 and it appears to be the same one used for a 305 throughout the 80's but when I pulled the old one out, the thread fitting was a smaller size so the new one wouldn't fit. Also, the engine has a vacuum/sending unit by the thermostat that isn't connected and a oil pressure switch/sender by the oil filter that isn't connected to anything either. I also found what I believe is an Oxygen Sensor wire that isn't hooked up to anything and I can't get the instrument cluster's temp gauge working. I got the Oil Pressure gauge working but I'm not sure if it's right as the oil pressure tends to run high(close to 60) most of the time the vehicle is running down the road.


2. What year carb is this for? I've narrowed it down to a 4barrel quadrajet but can't figure out the exact year it was made or what year vehicle it came off of.

3. What in the world is this? I found it in the glove box. Was told A/C just needed a compressor. Turns out none of the vacuum lines are connected in the engine bay. Behind the dash, the heater orange hose that has the tee is connected. Heater blows (floor only?) at the same speed no matter what speed the switch is set to or what temperature or even if you turn it off. That tells me it's a vacuum issue but I can't tell from the service manual exactly what this is or where it goes. It doesn't appear to just "fit" on anything already under there.

Thank you for the help! I have wasted so many hours trying to figure these things out and it's a big hassle ordering parts and having to return them several times. This is a project I didn't want or plan on but once I started fixing stuff I decided I'd take it on and do it all the way. So far I've replaced the master cylinder, all the steel brake lines, front and rear hoses, rear drums, shoes, hardware, calipers, tie rods, power steering gear, power steering pump, power steering hoses, all the temperature sending units, speedo cable, and much more so you can imagine my frustration having to return parts or take them back to the store. I finally quit ordering them off rockauto because every one I got was wrong or adaptable but was a struggle to do so.

Picture #1 looks like the intake manifold part #.

Picture #2 M4MC Rochester Quadrajet Carburetor.
http://www.carbkitsource.com/carbs/numbers/Rochester/Quadrajet/17080201-17082526.html
http://quadrajetparts.com/decode-your-quadrajet-carburetor-t-5.html
17080213 is a R4-M4MC the M4MC Hot air side mounted choke Rochester Quadrajet 4 barrel carburetor.  This means the choke is located on the passenger side and is mounted on the carburetor.  The choke draws hot air through a copper tube from an enclosure on the intake.  It was used on 80-85 Chevy & GMC Trucks.

First # is the casting number:
170=Rochester Quadrajet-GM Division 1975 and later
8=1980's
0=0th year of the decade (model year not manufacturing date)
2=49 state legal Q-Jet
1=Chevrolet
3=Manual Transmission (info on this digit is fuzzy GM says ALL transmissions)

The second # is the manufacturing date:
273=273rd day of the year
3=3rd year of the decade (manufactured in 1983) 

CPX is the Assembly plant code.

If this M4MC is a manual transmission carb there probably is not provision for a kickdown or TV cable on the throttle arm.
http://www.oldcarmanualproject.com/manuals/Carbs/Rochester/Apps80-86/images/Image05_jpg.jpg
^^ From the Delco Rochester Carb Book 9C {1980 - CK20,G30,P20,P30, CONV TR H.D., All Transmissions, W & W/O AC}^^

Picture #3 is a heater blend door motor off some 90's or later model rig.  Looks similar to blend door motors on my 09 Impala or my '00 GMC T400 C2500.  No squares used this equipment stock.