Chevy 350 vacuum lines

Learn More: https://www.holley.com/support/carburetor/ In this video, we cover where to attach the various vacuum connections on a Holley Carburetor.

These diagrams include: Fig. 1: Vacuum hose schematic-1980. Fig. 2: Vacuum hose schematic-1980. Fig. 3: Vacuum hose schematic-1980. Fig. 4: Vacuum hose schematic-1980. Fig. 5: Vacuum hose schematic-1980. Fig. 6: Vacuum hose schematic-1980. Access our GM Full-Size Trucks 1980-1987 Vacuum Diagrams Repair Guide by creating an …I have 1989 chevy c1500 350 5.7l and i cannot find any vacuum hose diagrams or schematics. does anyone know where i - Answered by a verified Chevy Mechanic. ... How can I get a vacuum hose diagram for a 1990 Chevy Van, 350 engine (5.7), Automatic transmission, power steering, ...yes i am missing a line on the passenger side. the line that goes to the canister is there and it does go to the canister. i have just came in the house from looking at it again. the little thing is a round connector between the line from the intake to the cainster but also on the bottom of the connector thingy there is a rubber elbow needing a line from somewhere. and when i try to start it ...2. Vacuum hose from the engine runs over to the vacuum reservoir under the hood and connects to a port on the bottom. My reservoir is a short black canister mounted on the firewall just above the blower motor housing. There is a 2nd port on the bottom of the canister, which is where the vacuum line from the HVAC connects after it comes through ...CHEVROLET 5.7L/350 Chevy small block Gen I Vacuum Lines - Free Shipping on Orders Over $109 at Summit Racing. Sort By. Default Sort Product Line (a-z) Product Line (z-a) Part Number (a-z) Part Number (z-a) Price (low-high) Price (high-low) New Arrivals. Records Per Page. 25 Records Per Page 50 Records Per Page 100 Records Per Page. Home.These are exact reproduction TH350 transmission vacuum lines in original material, featuring the correct bends and flared ends as original. All TRS lines are made from the original GM blueprints assuring an excellent fit for your 1969-1972 Chevelle. Manufacturer Part Number : CTV6903. Part Notes: For use with factory right side modulator.

Rebuilding vacuum lines & emissions controls in a 1979 K10 350/5.7. A previous owner intended to register this truck as off-road only or in a non-smog county in CA, and none of the emissions or exhaust were in place when I bought it. I was living in OR at the time so I wasn’t worried, but now that I’m back in CA I’ve been trying to ... 1970 350 Vacuum Lines. Hi folks, new here, just bought a nice 1970 SS. Upon inspection of the engine bay, I removed the air cleaner and noticed that one of the vacuum lines coming off the bottom of the air cleaner is not plugged into anything. I look at a vacuum line diagram and it says that it should go to the intake manifold, but I don't know ...Jun 11, 2002 · There are differning opinions on where to hook up the vacuum advance line. There are two possible vacuum ports on the carb. One is a ported vacuum source and the other is an unported vacuum source. Try both and use the one that makes the car run the best.-----Pearl blue & white 69 Camaro with supercharged 350, Tremec TKO, and 3.73 12-bolt Pcv fresh air hose. This hose goes from the throttle body to the passenger side valve cover on ls engines. If you're looking for the Pcv hose with the foam padding (drivers side) it's part #12574660. The hose fit great and easy to install. Even has the manufacturing date and part number on the hose. My original one was dated 2-12-00.I need a vacuum hose diagram for a 92 350 where can I find one, No it is a 350 Chevy, I'm trying to find a vacuum - Answered by a verified Chevy Mechanic. ... How can I get a vacuum hose diagram for a 1990 Chevy Van, 350 engine (5.7), Automatic transmission, power steering, ...Shop vacuum lines and vacuum hoses from top brands, including Classic Tube, Scott Drake, ACDelco, and others. Summit Racing has a huge in-stock selection. ... Vacuum Line, Power Brake Booster Line, Chevy, Each. Part Number: ADO-176-1086. Not Yet Reviewed. Estimated Ship Date: Jun 7, 2024 if ordered today. Free Shipping; Special Order

The vacuum supply for a modulator is supposed to be full manifold vacuum. Usually it comes off of a vacuum port tapped into the manifold, itself. As long as you're below the venturi's on your carb (baseplate) you'll have full manifold vacuum. When the only tool in your box is a hammer, you tend to see every problem as a nail.10156 posts · Joined 2010. #2 · Mar 12, 2017. Get the crane cams adjustable vacuum pot.Put the hose on a ported source. Set the lockout to about 10 degrees full advance. Adjust the spring tension to the light side so the vacuum pulls in timing easy. set the base at 14 degrees.1972 C10 350 Quadrajet Engine Vacuum Lines The 1967 - 1972 Chevrolet & GMC Pickups Message Board Register or Log In To remove these ... '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA 03-12-2022, 11:40 PM #11: towbar. Registered User ...Jan 23, 2020 · - Vacuum tree screwed into the intake near the back of the carburetor. This tree provides manifold vacuum to the HVAC, the TH350 and the air cleaner. Carburetor is not part of this set of lines. - Carburetor has three connections:-- Large threaded metal fitting and large hose on the back running over to the Power Brake booster

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Unhook your vacuum advance and plug the source or hook your gauge up to it, either way it doesn't matter. Run the motor up to 3,000rpm and set the timing at 32 …Vacuum line help- what is this and where does it hook to? « on: May 22, 2011, 06:05:48 PM ». I thought the vacuum line to the temp sensor on the air cleaner was where it hooked up. However looking at vacuum diagrams I cannot find it, and I think it tees off a line running to the carb, unless I'm missing a switch somewhere. Logged.1988 350 from Trans Am Now 355 cu. in. 9.5:1 flat top pistons stock crank and rods heads ground to except miloden 2.02-1.60 valves ... Victor Jr. intake manifold has a vacuum hose hook up and on that hook up I have the headlights, there are 2 vacuum thingies on the carb (small ones) and one is hooked up to the vacuum advance on the distributor ...Cant figure wiring out. go to internet & type in the following; 1984 chevy 350 free wiring Diagram and then repeat for 1991 chevy c2500 free wiring diagram. these diagrams are free and used by all mechanics. Dec 11, 2008 • 1991 Chevrolet C2500.Jan 23, 2017 · 1978 C10 350 in California. I recently replaced the water pump, and intake manifold in my C10. The EFE-TVS was helplessly rusted into the thermostat housing and had to be replaced. Ive got most everything buttoned up now and I'm working on all the vacuum lines. The truck did pass smog before i bought it, but I have little faith it was hooked up ... Ended up with some weird vacuum line that melted, swelled up and fell off causing some running issues

May 7, 2013 · Hello all, I need some help on how to properly run the vacuum lines on my new motor. I recently got a 1987 Chevy 350, with a holley 600 carb put in my malibu. I have the vacuum advance, transmission vacuum line, brake booster, and pcv lines to put on. I dont know exactly how to route them... 593 posts · Joined 2007. #3 · May 28, 2007. Most automotive vacuum hoses use 1/32" smaller id than the od of the hose nipple to make a tight fit. 7/32 on 1/4, 5/32 on 3/16, etc. You can't fix stupid but you can fix ignorance. 62 Chevy II Turbo 6.I have a 1962 chevy impala 4 door sedan. I would like to replace the original 6 cylinder engine with a chevy 350 /5.7 engine. My question is can … read more. JOHN aka Eauto. self employed. High School or GED. 25,627 satisfied customers. I have a 2004 chevy impala SS. There are 2 vacuum hoses.1977 350V8 vacuum line diagram - Chevy Message Forum - Restoration and Repair Help. Chevy Forums FREE technical assistance for your restoration and repair. Model specific subject matter experts, classified ads and more.How To Repair Your '68-82 Corvette's Headlight And Windshield Wiper Door Vacuum System. ... Family Bow-Ties: Pro Street 1983 Chevy Monte Carlo Grocery-Getter. Hot Rod Staff | Dec 29, 2023.SOURCE: vacuum diagram for 78 chevy. 1978 Chevrolet Truck C10 1/2 ton P/U 2WD 4.1L 1BL 6cyl Fig. 14: Vacuum hose schematic - 1978 250 engine, light duty emissions (except California) Fig. 15: Vacuum hose schematic - 1978 250 engine, light duty emissions (California) Hope helps (remember to rate this answer).I need a vacuum hose diagram for a 92 350 where can I find one, No it is a 350 Chevy, I'm trying to find a vacuum - Answered by a verified Chevy MechanicGet ratings and reviews for the top 7 home warranty companies in Chevy Chase, MD. Helping you find the best home warranty companies for the job. Expert Advice On Improving Your Hom... Find CHEVROLET 5.7L/350 Vacuum Lines and get Free Shipping on Orders Over $109 at Summit Racing! ... Power Brake Booster Vacuum Hose, Rubber/Steel, Chevrolet, GMC, Each. Jan 28, 2024 · I need a vacuum diagram for a 1978 350 chev 1 tonVacuum line diagrams Vacuum line diagrams: there is a vacuum hose coming from theVacuum hose diagram routing chevy vaccum chevrolet sponsored links 1999. Vacuum hose routing diagram chevyHoses emissions 1977 2001 hose chevroletVacuum line diagrams: hi, i need to replace all vacuum lines on my.... In this video, we finally solve the mystery and I show you where this vacuum line goes on your 91-04 Chevy Blazer, S10, GMC Jimmy, S15 and similar Vehicle. T...

from Sierra Vista AZ. use 1/4" steel tube, with 7/32 rubber at the ends.... squirrel, Nov 17, 2006. SHARE POST #3.

Each clockwise turn of the Allen wrench will add about 1.5 degrees of additional advance above 5 to 7 inches of manifold vacuum. The maximum is about 14 degrees of vacuum advance. If too much advance is added, the engine will either start to knock or ping or perhaps it may surge slightly at very light throttle opening with high vacuum.If the distributor has very stiff centrifugal advance springs in it that allow maximum timing to only come in near red-line rpm, the vacuum advance control unit can be allowed to pull in more advance without the risk of exceeding the 52-degree maximum limit. ... 350 Chevy in a 72 Nova Example #1 224 @ 50 cam 9.0:1 compression Iron heads Headers ...The barrel shaped plastic tee in Fig 1 is a vacuum check valve that helps maintain vacuum in the HVAC reservoir. The capped port on the check valve would have connected to a factory cruise control actuator (vacuum motor) if the vehicle had cruise control. Copy that. Truck does not have cruise control.Posted on Feb 21, 2010. SOURCE: need vacuum line diagram for 1990 Chevy Silverado. The vacuum diagram for the truck should be printed on a factory sticker right next to the hood latch inside the engine compartment. If its missing or ruined you could try looking inside a Chilton or Haynes manual.I have a record of a 97 vortec 5.7 with an average map of 35 kpa at a warm idle and 49 kpa at a warm cruise @ 60 mph. If you feel like doing the conversion. What does the vacuum do when you snap the throttle? Speaking of prius, I just replaced my 1st hybrid battery in a 2005 prius today.Vacuum lines on 1997. Thread starter newbie78; Start date Mar 3, 2014; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission. Mar 3, 2014 #1 N. newbie78 Full Access Member. Joined1988 chev k2500 350 tbi vacuum hose routing vacuum line routing - Chevrolet 2500 question. Search Fixya. Browse Categories Answer Questions ... Vacuum hose routing for 1992 Chevy K3500 5.7 one ton TBI. Cars & Trucks; 3,075 views . Ask a Question. Usually answered in minutes! Expand. Popular Questions ...Sep 29, 2019 ... EMISSIONS , VACUM AND CANISTER DELETE 1985 C10 305/350 ... 1994 c3500 tbi vacuum lines identification ... 1984 Chevy Truck C10 K10 Engine Stall when ...

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SOURCE: vaccum hose diagram for 88 chevy truck. it may not be a vacumn leak from a line,check the throttle shaft for movement,for example,i had a 89 1 ton 350 and my throttle shaft was moving around a lot and in order to keep it from idling high,i had to kick the throttle pedal.But also check the idle air control valve,which is the round …(distributor vacuum line) Neva worked on a car with a 350 transmission Click to expand... transmission gets vacuum from the port on the back of the intake manifold.Find all the car vacuum parts you need to get your hot rod's AC system up and running! Old Air Products carries actuator vacuums, and more online. ... Vacuum Hose | Hose Kit 8 pcs, Colored. SHOW DETAILS. Compare ... Old Air Products 23-5928 - Actuator | 1967-1972 Chevy and GMC Trucks, Single Port with Stud in Arm. SHOW DETAILS.This should be helpful to some, a cheap sure do it yourself trick for finding any vacuum leaks your car or truck may have. This can help out major because en...Step 5: Remove the brake booster vacuum hose. When removing the vacuum hose from the vacuum brake booster check valve, use a twist and pull method. The twist should break the seal and allow you to pull the hose off. Step 6: Remove the vacuum brake booster check valve. Removing the check valve can sometimes be as easy as using the twist and pull ...Dec 14, 2017 ... I'm positive the auto industry is not happy with you showing us that wire trick. We were supposed to pay a highly trained, state of the art ...SOURCE: vaccum hose diagram for 88 chevy truck. it may not be a vacumn leak from a line,check the throttle shaft for movement,for example,i had a 89 1 ton 350 and my throttle shaft was moving around a lot and in order to keep it from idling high,i had to kick the throttle pedal.But also check the idle air control valve,which is the round sensor ... Rebuilding vacuum lines & emissions controls in a 1979 K10 350/5.7. A previous owner intended to register this truck as off-road only or in a non-smog county in CA, and none of the emissions or exhaust were in place when I bought it. I was living in OR at the time so I wasn’t worried, but now that I’m back in CA I’ve been trying to ... I swapped a 4bbl onto the 350 in my 74 but I still have the original 2bbl intake/carb sitting in the garage. The vacuum hoses on it are hooked up as follows: One of the two small ports on the back of the carb has a short hose that goes to the choke pull-off on the carb. The other small port has a longer hose that goes up to the ThermAC air …DRJEFFCOYLE. MEMBER. 1997 CHEVROLET TRUCK. The pcv hose on the driver side of the 5.7 liter engine connects from the valve cover to the intake manifold. There is another smaller vacuum line that comes from this connection at the intake manifold. Where does this vacuum line connect? ….

SOURCE: i need a 1987 chevy S10 vacuum hose routing diagram. Go to Autozone.com, become member, will give you repair manual,location of parts,diagrams. ... 1990 chevy 350 distributor wiring diagram and firing order. 1990 Chevrolet C1500. Torque Spec for '99 Chevy C1500 5.7L engine lower intake manifold.Ok, if you click the link below, you can get the vacuum diagram for the engine. CLICK HERE FOR DIAGRAM. Anthony. Category: Chevy. Satisfied Customers: Experience: Verified. Anthony and 87 other Chevy Specialists are ready to help you. Ask your own question now.Ended up with some weird vacuum line that melted, swelled up and fell off causing some running issuesTop 6 Reasons Why Your Chevy 350 TBI Bogs On Acceleration. #1. Leaking Vacuum Lines. A vacuum leak results in supplying the wrong air/fuel ratio into the engine, thus, resulting in bogging or rough and slow acceleration. Some other symptoms to look out for to ensure that the problem is indeed a vacuum leak are hissing sound from the engine bay ...Ac trouble. 2011 Chevrolet Express Van 3500. Replaced vacuum lines from reservoir and manifold. Replace blend door - Answered by a verified Chevy Mechanic ... 2011 Chev Express Van 3500. No AC. Found two bad vacuum lines, one from manifold and one going to vacuum reservoir. ... it should be 30 to 40psi on low and 275 to 350 on high side The ...In case you are still uncertain on where to hook up vacuum line: There is usually a port directly behind the carb. on one of the intake runners. If not there is the port on the bottom backside of carb. (usually for power brakes), or on the front of the carb. at or below the throttle blades.The body of the Tahoe is gone now. I have all the plastic vacuum lines, but can't tell determine what they went to. All I really need is a clear photo of the diagram or a drawing of some kind. Or even better, a diagram from a manual. I hate to buy a Tahoe manual when I really don't have the entire vehicle. Dec 19, 2008.Automatic Transmission Modulator Line, Steel, Chevy, TH400, Fits Models with Factory Equipped 350 Engine Only. Part Number: CST-CAM1006-OE. Not Yet Reviewed. Estimated Ship Date: May 22, 2024 (if ordered today) Drop Ship. Oversize $9.99.1976 gmc 350 v8 vacuum diagram - Looking to redo all vacuum lines and need to know where everything runs ... Looking to redo all vacuum lines and need to know where everything runs. 1976 GMC C/K 1500 Series-Maintenance & Repair. ... Used Chevrolet C/K 10. 209 listings starting at $25,900. Used GMC Sierra. 7 listings Used Chevrolet C/K 20. 26 ... Chevy 350 vacuum lines, 350/5.7. The actuating line for the TH350 modulator can go either straight to the intake manifold (there's usualy a tap point right behind the carb mount) or to an up-ported tap on the q-jet. Vacuum advance line comes from the factory hooked up to a manifold port on the Q-jet but there are many different views on that., Effective cleaning of these passages requires removal of the intake manifold. Check the vacuum source to the EGR solenoid. Connect a vacuum tester (Mityvac) to the line leading from the TBI unit to the front (single port) side of the solenoid. There should be full vacuum at idle, around 20 inches/Hg on a stock engine., The schematic I'm looking at (76-85 A/C vacuum schematic) shows two black lines coming off the A/C control. They come together at a T-fitting and then one line goes through the firewall to the vacuum tank. Logged. 1973 GMC K2500, Super Custom, Camper Special, 350, TH350, NP203, 4.10's. 1974 Chevrolet K10, Custom Deluxe, 350, SM465, NP203, 3.73's., All Time: 107,095. The year range is pretty non specific. If the truck has a vacuum hose to the transmission (to the vacuum modulator), the line will be a metal tube attached to the large tube that the transmission dipstick is in. It will come up and connect to a hose that will run to the base of the carburetor.... - 1988-1998 GMC Pickup., Vacuum line help- what is this and where does it hook to? « on: May 22, 2011, 06:05:48 PM ». I thought the vacuum line to the temp sensor on the air cleaner was where it hooked up. However looking at vacuum diagrams I cannot find it, and I think it tees off a line running to the carb, unless I'm missing a switch somewhere. Logged., I have a 79 Chevy 350 engine that I need a vacuum diagram for, and yes I have been to several libraries in my area looking for a manual without finding it. Any help would be great, Re: Vacuum Lines on 305 Engine. « Reply #9 on: July 21, 2016, 09:23:58 AM ». The blue/black check valve is correctly connected to the TCC switch on the firewall (above). Cap the vacuum nipple that used to connect to the EFE (below). There shouldn't be a check valve in the tip-in switch vacuum line, so you are okay there., Plugging it into the carb could create a false vacuum signal under boost that could cause excess ignition advance and detonation. 3. Here is a close up of the mechanical advance system. As RPM ..., Manifold Vacuum Fittings are available in a 90° or T-style fitting. The 90° fitting has a single 3/8" vacuum port and the T-style fitting has a 3/8" and 1/4" vacuum port. Both styles are available in zinc-plated steel or chrome-plated aluminum. For those simply needing to plug the vacuum port in the intake manifold, order part #30-1434., Ive got an 88 c1500 that I swapped the 350 SBC for a 1995 model 350 SBC and a new TH350 transmission. The truck originally had a 700r4 transmission in it but it went bad so I just put in a 350 turbo tranny. Now, I knew that I had to had some type of vacuum source for the modulator valve on the tranny so I spliced into a line that was …, Carburetor Vacuum Lines The 1967 - 1972 Chevrolet & GMC Pickups Message Board Register ... Carburetor Vacuum Lines Web 67-72chevytrucks.com: User Name: Remember Me? Password: Home: ... Join Date: Apr 2013. Location: Princeton, NJ. Posts: 40 Carburetor Vacuum Lines. Hi guys, I have a 1971 C20 with a 350 and Quadrajet carb. Take a look at ..., 17159 posts · Joined 2010. #8 · Jul 27, 2011. be sure to hook the fuel pressure regulator and map sensor (flat rectangle box with 3 wire plug and 1 vacuum line connection) to direct manifold vacuum. :bowtieb::flag6::bowtier: 1956 210 del rey sedan 383 700r4 12 bolt posi. 1968 Camaro 468 bbc power glide 12 bolt., Find CHEVROLET 5.7L/350 Fittings & Hoses and get Free Shipping on Orders Over $109 at Summit Racing! ... Brake Lines, Braided Stainless Steel, Chevy, GMC, SUV, Pickup, Front, 4-6 in. Lift, Pair. Part Number: SJA-FBL88. 5.0 out of 5 stars. Estimated Ship Date: Today. Free Shipping, Edelbrock 1406 Vacuum connections. I've checked most of the archives and now I'm more confused than I was. I have a 92 350 truck engine that I put an performer intake and 1406 carb with a HEI distributor. I'm now to the point of putting the engine in and wanting to know which vacuum source/ports to use. I have a turbo 350 trans that needs to be ..., Today we'll be showing how to test and replace the brake booster and the brake booster vacuum line. The vacuum line tends to be an easy repair for most vehic..., 5.7L. V8. 4WD. AUTOMATIC. 215,000 MILES. The PCV runs from the valve cover to (I have no idea) a black thing that has a vacuum tube running out of the top. The vacuum hose coming out of the top is broke off flush and I cannot for the life of me figure out where it goes. It has a lot of vacuum and when I put my finger over it the truck shuts off., Aug 14, 2023 ... General Tech - Vacuum hose routing sbc - 1968 307 ​ ​​​​​PCV valve is hooked up in the passenger side valve cover. Do my vacuum lines look ..., sbvelleman said: The vacuum canister has two ports. The larger port is the vacuum source and connects to the intake manifold via a hose, obviously. The smaller port connects to a hose which goes thru the firewall. That hose is connected to port #6 of the main vacuum function switch and port #1 of the temperature vac. switch ., Impossible to find this, I just added a brake booster to my 55 it has a 350 motor, were do I put the vacuum line to. ... 1956, and 1957 Chevy owners and enthusiasts. Come join the discussion about restoration, engine swaps, reviews, performance, modifications, classifieds, troubleshooting, maintenance, and more! Open to all models including Belair, …, Apr 23, 2018 ... ... 156K views · 3:07. Go to channel · Testing the TPS (Throttle Position Sensor) - 1994 Chevy C1500 350 TBI. Moe C•486K views · 2:01. Go to c..., I show and discuss that just changing the Modulator may not help anything. that the valve in the transmission case may be the issue. watch this video in its ..., Hello, I have a 1977 350 with 350TH trans. I am looking for a good diagram and description of the vacuum lines on the motor. It has the quadrajet carb, all original. I'm getting a rough idle and want to make sure the previous owner hooked everything up correctly. I also have to change a vacuum line in the winter to get the heater to work., By end of August and into September, the price of lumber could settle in a range between $350-$450 per thousand board feet, an analyst told Insider. Jump to Lumber futures are slid..., Nylon hose: Vacuum line diagram for chevy 350. Check Details. Line vacuum distributor where carb hose impala heater choke. I need a detailed vacuum diagram/emissions diagram for a 1986 3/42001 pontiac grand prix 3.8l fi ohv 6cyl 21 chevy 350 vacuum diagramChevy wiring gmc blazer 1982. Vacuum diagram 350 chevy lines 1984 sbc wiring schematic ..., I have a record of a 97 vortec 5.7 with an average map of 35 kpa at a warm idle and 49 kpa at a warm cruise @ 60 mph. If you feel like doing the conversion. What does the vacuum do when you snap the throttle? Speaking of prius, I just replaced my 1st hybrid battery in a 2005 prius today., Chevy diagram wiring tbi vacuum line database1981 chevy truck fuse box diagram Vacuum diagram chevy line routing firebird pontiac hose 1974 1971 transmission 1975 schematic am lines engine diagrams carburetor repair truckDiagram vacuum chevy 1984 350 routing van emissions c30 ton gmc emission control 350ci gm smog duty 4bbl g30 2008., First of all *Facepalm* Okay, now that thats through, how much damage can not having a vacuum line on the trans do? I ask because I noticed that Mr. Francis Delores of Brian's Automotive in Burien is such an immense douchebag that when he installed my TH350, he both crimped the bejesus out of the line and then reused some old rubber …, The Chevy 5.7 Vortec Vacuum Diagram is a visual representation of the vacuum system in a Chevy 5.7 Vortec engine. It shows the various components and their connections, including the intake manifold, throttle body, vacuum hoses, and valves. The diagram is important because it helps mechanics and car owners understand how the vacuum …, The schematic I'm looking at (76-85 A/C vacuum schematic) shows two black lines coming off the A/C control. They come together at a T-fitting and then one line goes through the firewall to the vacuum tank. Logged. 1973 GMC K2500, Super Custom, Camper Special, 350, TH350, NP203, 4.10's. 1974 Chevrolet K10, Custom Deluxe, 350, SM465, NP203, 3.73's., Vacuum line help- what is this and where does it hook to? « on: May 22, 2011, 06:05:48 PM ». I thought the vacuum line to the temp sensor on the air cleaner was where it hooked up. However looking at vacuum diagrams I cannot find it, and I think it tees off a line running to the carb, unless I'm missing a switch somewhere. Logged., I have a record of a 97 vortec 5.7 with an average map of 35 kpa at a warm idle and 49 kpa at a warm cruise @ 60 mph. If you feel like doing the conversion. What does the vacuum do when you snap the throttle? Speaking of prius, I just replaced my 1st hybrid battery in a 2005 prius today., Rebuilding vacuum lines & emissions controls in a 1979 K10 350/5.7. A previous owner intended to register this truck as off-road only or in a non-smog county in CA, and none of the emissions or exhaust were in place when I bought it. I was living in OR at the time so I wasn’t worried, but now that I’m back in CA I’ve been trying to ...