Chevy 350 vacuum lines

After several weeks of the engine stalling out when not applying gas, I have it running. Key changes, the EGR valve likely bad so capped it. Capped the smal...

WHAT IS A VACUUM LEAK AND HOW TO FIX VACUUM LEAK ON CHEVY, CHEVROLET, BUICK, GMC, CADILLAC Great Car Scanner: https://amzn.to/2QmNBri Check out our Amazon ...Boonduff Discussion starter. 353 posts · Joined 2011. #3 · Dec 11, 2011. Thankyou, dipstick, for trying to help but that diagram doesnt exactly match my truck. On what they have labeled as the purge vacuum diagnostic switch. I have a third nipple pointed out towards the passenger fender. All thats on the nipple is an elbow and I cant find any ...Need vacuum line diagram for 1989 chevy 350 g30 van. Chevrolet G30 Cars & Trucks; Open Questions: 0 answers. 2004 Chevrolet Silverado Z71. I replaced the bulbs in my Bose radio AM/FM, cassette tape and single CD player. Now it will not come on. My Silverado is a 2004 Z71 extended cab 4WD. When first plugged it in after bulbs were replaced, a ...3006 posts · Joined 2014. #15 · Jun 28, 2020. It is best to use a metal line for all but the connections at the modulator valve and if necessary at the intake manifold. If you try to run a rubber hose the full length the hose will eventually get soft and suck together which will not allow vacuum to get to the transmission.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 ...Jul 15, 2003 · The ports on the TBI unit are labeled with leters which I will reference here. back of TBI unit: port F goes to the MAP. front of TBI unit: port J goes to EGR. port C goes to PCV. port A goes to charcoal. port B goes to aircleaner. -1971 FJ55 (aka Trail55): 6.0L-NV4500-LC split case, SOA, D60s, ARB'd... and cupholders :flipoff2: Author Topic: Vacuum Diagrams 1980-1986 (Read 3663 times) . VileZambonie. Global Moderator; Senior Member; Posts: 19026; Vacuum Diagrams 1980-1986 « on: December 31, 2018, 07:43:26 AM »

I need to know what hoses hook up to what ports on the carberator as well as all vacuum lines. ... 79 Chevy: ton..4x4, 350 crate engine..carb..emissions. I have a 79 Chevy 1/2 ton truck, 4x4, 350 crate engine. It has a 4-barrel Rochester carb. I'm using the vehicle as more of an off-road vehicle and does not require emissions.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.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.The line comes off the vacuum tee on the intake manifold, and rather than go directly to the modulator, it attaches to one end of cylinder (about 4 inches long and 1 1/2 in tall) and then out the other end of the cylinder to the modulator. ... the previous owner had swapped in a chevy 350/TH400 combo. Pretty common nowadays to see T/A's that ...Vacuum Lines For Chevy, Dodge, Ford, & More Do you need a new vacuum line? Vacuum lines are giant air compression systems that create power for your engine. ... Fine Lines FTV6903SS- 69-72 Chevy Camaro, Turbo-Hydramatic 350 Vacuum Line w/Modulator on Right Side; Stainless. Sale price $26.82 Regular price $29.80. Re-stocking soon. Add to cart ...

101 posts · Joined 2012. #1 · Oct 14, 2013. My project truck is an hour away, but i'm trying to purchase some silicone vacuum lines to install. Are there standard line sizes (3/8, 3/16) or is it all dependent upon the carb, etc used in the build. Also, should I be purchasing a vacuum line 1/32 smaller than the fitting to ensure a snug fit ...Where you can attach brake booster vacuum line on intake manifold or carburetor. Any older classic hotrod car truck. Join this channel to get access to perks...Find CHEVROLET 5.7L/350 Chevy small block Gen I Vacuum Lines and get Free Shipping on Orders Over $109 at Summit Racing!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. CHEVROLET 5.7L/350 Chevy small block Gen I Vacuum Lines - Free Shipping on Orders Over $109 at Summit Racing. Air & Fuel Delivery.

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As far as the low vacuum reading goes it could be as simple as the timing being slightly retarded or the distributor vacuum advance not working properly. At idle, more ignition timing means more manifold vacuum, at least up to a certain point. Also at 85,000 miles on an untouched SBC it might be time for a new cam timing chain and gear set.Locating a suitable vacuum line Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Locating a suitable vacuum line - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com You are browsing camaro5The vacuum line diagram for a Chevy 350 engine shows the routing of the vacuum lines and the connections between the different components. It provides a visual guide for car owners and mechanics to follow when inspecting or repairing the vacuum system.AutoZoneGM Chevy Mid-Size Cars 1964-1988 Repair Guide ... Fig. Fig. 4: 1971 V8 enginevacuum hoses ... Fig. Fig. 12: 1976 350 V8 engine-4bbl with EFE and AIR injection systems .... Fig. Fig. 52: 1980 5.7L V8 engine-automatic transmission federal. images for 1988 Chevy V8 5.7L 350 4bbl vacuum ...A guy can put a three connection vacuum canister in a 5 o 6 line truck and using a vacuum control unit have the identical function. Next port the short one in the middle is where the vapor line from the fuel tank(s) connect. And the last port in the picture it is plugged off that connects to the bowl vent in the carburetor.The vacuum lines carry a negative pressure, or vacuum, which is used to control the movement of air, fuel, and other fluids within the engine. A vacuum line diagram helps …

Chevrolet's small-block V-8 engine timing specifications depend on the cubic-inch displacement and whether a manual or automatic transmission matches the engine. Small-blocks have ...Details. Edelbrock part #8096 Vacuum Adapter Fitting is a low profile elbow that is designed to provide clearance for Holley and other carbs with a rear fuel bowl that extends over the vacuum port tap in most intake manifolds. Machined from solid brass. More Information. More Information.79 chevy 350 vacuum line and plug ID. Here a few pictures of what I took off this 1979 chevy 350 motor. Can anyone tell me what and where the vacuum line and wires are for. It was on the intake manifold. might have been the trans lock-up solenoid. I've never seen one mounted on intake, usually on firewall. And a bunch of other junk.I recently bought a 1995 2 door Tahoe 4WD with the original 5.7 TBI with 278XXX miles. I have a vacuum line that originates behind the TBI from a metal fitting threaded into the top of the manifold. The line is then draped over the drivers side valve cover and is not connected to anything on the other end.KevinW. 12284 posts · Joined 2000. #4 · Dec 30, 2009. Re: TH350 Vaccum Modulator Line. The TH350 gets vaccum from the intake manifold fitting located between the carb and dist. Kevin. 69' SS-350 Convert, M20, 3.31 posi. Disassembled & boxed. - …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 ...there is vacuum from inside the carb that pulls the filtered air it gets from the back of the carb thru the heat crossover, which is then heated and pulled thru the choke coil into the carb. this heats up the coil and opens the choke as much as it needs. this is the best choke setup ever devised, and i would definitely try to get it working ...Re: 79 c10 350 with edelbrock carb and intake. vacuum lines?????? It does run better now that the tranny line is hooked to manifold vacuum. Before that switch it was stumbling and shifting at a higher than ideal rpm. The only connected lines are the distributor, tranny, PVC to carb only, and brake booster.- Vacuum line from the barbed port on the rear side (two ports) of the EGR solenoid to the EGR valve ... Vehicle: 1995 Chevrolet K1500 stock 350 TBI; 153k miles. Symptoms: Stumble/hesitation/chuggi ng on application of very slight throttle. Crawling up inclines or slowly accelerating from green light or in parking lots, engine would stumble and ...Chevrolet Vacuum Line Diagrams / Chevrolet Blazer And Gmc Jimmy 1969 1982 Vacuum Diagrams Repair Guide Autozone : 305 v8 engine diagram best wiring library 1997 chevy 305 engine diagram vacuum line picsdiagram for 305 w qjet. (scoobydoomemes.blogspot.com)Part 2: how to trace out your vacuum lines on most vehicles from the late 1970s through the 1980s and into the '90s. I chose this 1984 GMC Jimmy because it o...

The typical cost to replace a faulty transmission vacuum modulator ranges between $150 and $390 for parts and labor. However, the total cost can vary depending on the specific vehicle and who does the work. Parts Cost: The vacuum modulator replacement part itself usually costs between $30 and $150. More complex modulators for automatic ...

Rubber vacuum lines would be larger diameter and would catch on things more easily. When you take apart the HVAC I think there are at least 7 of those lines running across to the controls, so it's a good sized bundle. ... Chevy Engine Size 350. I replaced mine with rubber vacuum tubing and always had success with it. Aug 7, 2021 #12 Snoots ...764 posts · Joined 2007. #5 · Apr 2, 2009. there are two large vacuum ports on your carb. One in front and one in back, the one in front is for PCV and the one in back is for your power brake booster. The tranny vacuum line typically connects to a port on the manifold, not the carb. (there should be some type of tapped hole that leads into ...The SBC 350 vacuum diagram is an essential component of understanding the operation of a Small Block Chevy (SBC) 350 engine. The vacuum system in an engine plays a crucial …The Chevrolet small block 350 engine is a 6.0 liter, overhead valve V-8 engine that is built for the small Chevy truck models. The 350 engine was made from 1970 until 1990. The 350 was a larger engine than the previous 318 which was produced from 1955 to 1966. The 350 engine is available in 4 barrel, 6 barrel, and 8 barrel versions.Jul 15, 2003 · The ports on the TBI unit are labeled with leters which I will reference here. back of TBI unit: port F goes to the MAP. front of TBI unit: port J goes to EGR. port C goes to PCV. port A goes to charcoal. port B goes to aircleaner. -1971 FJ55 (aka Trail55): 6.0L-NV4500-LC split case, SOA, D60s, ARB'd... and cupholders :flipoff2: 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.- Vacuum line from the barbed port on the rear side (two ports) of the EGR solenoid to the EGR valve ... Vehicle: 1995 Chevrolet K1500 stock 350 TBI; 153k miles. Symptoms: Stumble/hesitation/chuggi ng on application of very slight throttle. Crawling up inclines or slowly accelerating from green light or in parking lots, engine would stumble …Buy Corvette Intake Manifold Vacuum Fittings online at Zip. Specializing in C3 Chevrolet Corvette Parts since 1977. Same day shipping. No-Hassle Returns. ... 70-72 350 w/Auto Intake Manifold Vacuum Fitting Price: $27.99. SKU: …Re: 1977 350V8 vacuum line diagram 01-14-05 10:44 AM - Post# 482596 In response to good.wrench Oh, gosh, everyone is looking for vacuum diagrams, including me! I just logged on after being away for months because I thought someone out there might have the vacuum diagrams for a 1977 Chevy Caprice Classic landau coupe, 4-barrel, 350V8, and I find ALL of you have been looking for diagrams as well.

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Learn More: https://www.holley.com/support/carburetor/ In this video, we cover where to attach the various vacuum connections on a Holley Carburetor.vacuum diagram for 1990 chev 5.7 / 350 engine - Chevrolet 2500 question. Search Fixya. Browse Categories Answer Questions . Chevrolet 2500 Car and Truck; Chevrolet Car and Truck; Cars & Trucks ... Vacuum hose routing-1990-91 2.2L and 2.5L Federal engines with manual transaxles, and 2.2L and 2.5L Canadian and California engines ...The vacuum diagram for the Chevy 5.7 Vortec engine shows the various vacuum lines and components that make up the system. This diagram is often found on a sticker under the hood, but if it is missing or illegible, it can be found in the vehicle’s service manual. The diagram provides a visual representation of how the vacuum lines are ...1988 chev k2500 350 tbi vacuum hose routing vacuum line routing - Chevrolet 2500 question. Search Fixya. Browse Categories Answer Questions . Chevrolet 2500 Car and Truck; Chevrolet Car and Truck; Cars & Trucks ... SOURCE: 88 chev,350, stick,2wd, 3500, gas flows to.Conveniently packaged in a variety of diameters and lengths. Durably engineered from corrosion and heat-resistant PVC vinyl. Also suitable for a broad variety of household, industrial and commercial uses. Support available - every Dorman part is backed by Dorman's ASE Certified technical support team.675 posts · Joined 2007. #1 · Dec 31, 2011. i decided to start a new thread with questions regarding the vacuum ports on my carb. you can see the mechanic hooked up the vacuum advance to the lower left port which has no vacuum but, for example, i see another member, Philip has his hooked up this way. does anyone have an idea if these readings ...1985 Chevy C10 LWB with bone stock 305 1971 Oldsmobile Cutlass Supreme with Rocket 350. OldsFan. ... The original Quadrajet in my '75 GMC 350 had a second vacuum port for the evaporative canister, on the lower front of the carburetor next to the large port for the PCV valve hose. ... but I wasn't sure that I didn't just create a big vacuum leak ...Check this diagrams for 1985 Chevrolet Truck G30 1 ton Van 5.0L 4BL 8cyl (click over pic for zoom)... Fig. 123: 1985 5.0L and 5.7L engines-Federal with automatic transmission (G10, 20 and 30 models) Fig. 126: 1985 5.0L and 5.7L engines-California with automatic transmission (G10, 20 and 30 models) Hope this helps. ….

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 …You read correctly that the vacuum modulator failure will cause a hard shift. The modulator receives a vacuum signal from the intake manifold (in most cases). It tells the transmission how much load is being placed on it. The pressure is increased in low vacuum conditions, i.e. full throttle. The diaphragm inside that modulator is obviously ...Can anyone recommend a PCV valve part number for a stock 350 Chevy that doesn't pull vacuum at idle. Two I tried pull so much vacuum at idle, the engine stalls when I put the trans in gear, like a big vacuum leak. I suspected one may be defective so I replaced it with a new one, but it's basically doing the same thing.Vacuums are handy and convenient, but they're not built for every kind of mess. There are so many smart ways to use a vacuum besides just running it over your carpet, but there are...Check this diagrams for 1985 Chevrolet Truck G30 1 ton Van 5.0L 4BL 8cyl (click over pic for zoom)... Fig. 123: 1985 5.0L and 5.7L engines-Federal with automatic transmission (G10, 20 and 30 models) Fig. 126: 1985 5.0L and 5.7L engines-California with automatic transmission (G10, 20 and 30 models) Hope this helps.Vacuum diagram for 78 chevy c10 pu 250 inline 6. 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). 2 answers.1974-75 Camaro 350 Hi Performance PCV Valve . ... 1978-79 Chevrolet Corvette; Vacuum Hose Clamp Sets. Vacuum Hose Clamp Sets for 1978-1979 Chevrolet Corvette. From restoration to performance, we are proud to offer the highest quality parts for both classic and late models Corvettes.In this video, I replace the brake booster vacuum line on the back of the carburetor on Ol' Blue.Remove the secondary rod hanger and rods by removing the screw holding the hanger in place. Remove the vacuum break Diaphragm by removing the two screws from the side, unplug the vacuum hose and slide the link out of the air valve lever. Remove screw and lever from choke shaft. Remove the 9 airhorn screws.Right Stuff Transmission Vacuum Line 1969-72 Chevy Bel Air, Biscayne, Chevelle, El Camino, Impala, Malibu, Nomad. Right Stuff CTV6903S ... T-350 RH Modulator ; OE Steel; View Details. $37.95 Ships Today Lowest Price Guarantee. Add To Cart. Right Stuff Transmission Vacuum Line 1972-75 Corvette. Chevy 350 vacuum lines, number9. 566 posts · Joined 2009. #12 · Sep 26, 2014. robpp said: fwiw here are some pics of my bone stock 69 350 350. my vacuum advance is fed from the front of the carb via a steel and rubber line. the T: right goes to the Brake booster. left (steel line) goes to kickdown. rear facing is not connected just blocked., September 8, 2022. The 5.3 Vortec vacuum diagram can be found online or in a service manual. The vacuum diagram shows the path of the vacuum hose from the engine to the various components in the vehicle. The 5.3 Vortec engine is a high performance engine that produces more power than the standard engine. The extra power is due to the increased ..., Access our free Vacuum Diagrams Repair Guide for GM Full-Size Trucks 1988-1998 through AutoZone Rewards. These diagrams include: Fig. 1: 1988-89 (VIN Z) C/K series with 4.3L , 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., 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, ..., 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 …, 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 ..., Apr 29, 2021 ... Andy Phillips shows an easy method to fix a broken vacuum line on your vehicle. Save the money on having to replace the entire line by ..., 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., The SBC 350 vacuum diagram is an essential component of understanding the operation of a Small Block Chevy (SBC) 350 engine. The vacuum system in an engine plays a crucial …, Where you can attach brake booster vacuum line on intake manifold or carburetor. Any older classic hotrod car truck. Join this channel to get access to perks..., I need the vacuum line diagram for a 1979 chevy 4.1l in-line six.Vacuum diagram chevy line 1981 lines fixya need hose schematic 1980 replace repair c10 diagrams pickup fig sorry limited try [diagram] 2004 chevy silverado vacuum diagramVacuum diagram 1972 chevy truck. ... 1984 Chevy 350 Vacuum Diagram - Wiring Site Resource. Check Details., Find CHEVROLET 5.7L/350 Chevy small block Gen I PCV Hoses and Tubes and get Free Shipping on Orders Over $109 at Summit Racing! ... PCV Hose, Rubber, Black, Buick, Cadillac, Chevy, GMC, Hummer, Isuzu, Oldsmobile, Pontiac, Workhorse, Each. Part Number: RNB-47038. Not Yet Reviewed. Estimated Ship Date: Today, 1972 AC Vacuum Line routing The 1967 - 1972 Chevrolet & GMC Pickups Message Board Register or Log In To remove ... 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame, Re: 79 c10 350 with edelbrock carb and intake. vacuum lines?????? It does run better now that the tranny line is hooked to manifold vacuum. Before that switch it was stumbling and shifting at a higher than ideal rpm. The only connected lines are the distributor, tranny, PVC to carb only, and brake booster., The 1985 K10 has a LE9 305 engine, with federal emissions (UHK vacuum diagram) and a couple year old Quadrajet (M4ME) and a TH700 transmission. A long story, but the guy who last worked on it a couple years ago left a bunch of vacuum lines poorly plugged, or not hooked up and it was barely drivable. I have hooked up some of the obvious vacuum ..., 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., Shop from thousands of parts and accessories to help you restore, maintain, and customize your Chevrolet, GMC, Dodge or Ford truck or SUV. Keep 'em on the road with the right part, right price, right now. ... Vacuum Advance Line 350 4bbl Chevy GMC 73-86 Required Quantity: (1) $17.95 ..., CASE 2: Vacuum was present. This is a problem, since vacuum should not be present when the engine is idling. This could be caused by one of two possibilities, either the EGR solenoid is defective or the vacuum hose is attached to the wrong port on the EGR solenoid. Resolving this 'continuous vacuum to the EGR valve at idle' problem will solve ..., 101 posts · Joined 2012. #1 · Oct 14, 2013. My project truck is an hour away, but i'm trying to purchase some silicone vacuum lines to install. Are there standard line sizes (3/8, 3/16) or is it all dependent upon the carb, etc used in the build. Also, should I be purchasing a vacuum line 1/32 smaller than the fitting to ensure a snug fit ..., The engine should snap right back to a steady 17- 21″hg vacuum. Steady low between 5-10″hg vacuum: This indicates that the engine has a leak in the intake manifold or the intake gasket. Steady low between 10-15″hg vacuum: This reading indicates late valve timing. There's a chance the vehicle has jumped timing., 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., You can buy vacuum hose by the foot at most stores. Do not get sucked in to buying 4' boxed pieces for $5. You may need two sizes, 5/32 or 7/32 is one of them. You might have a diagram under your hood. Pay attention to routing around sharp edges/hot surfaces/throttle lever., H 400 and TH 350 can use the SAME modulator. Keep in mind that adjusting the modulator is NOT the proper way to change the shift points. The modulator affects shift firmness, and the shift timing as a "side effect". Modifying the modulator raises the pressures inside the transmission and makes life tougher for the rubber seals and the pump., Look on the passenger side rear (just in front of the rear bolt) and see if there is not a 3/8 tube with a cap on it. If so connect the pcv to there and add the breather cap like stated by darbysan. The modulator was T'd in to the brake booster line, or supplied by the same manifold port, from the factory sometimes., Tech / General Engine - Vacuum Lines Diagrams!!! I GOT THEM ALL!!!!! - I just collected ALL vacuum lines from 82 - 92 TG F-Bodies!!!! If anyone needs one, search below on this 1st page. Models covered with vacuum lines are: 1982-1984 2.5L TBI 1985-1986 2.5L TBI 1982 2.8L CARBURETED 1983 2.8L CARBURETED 1984 2.8L..., 1986 Chevy C-10 Scottsdale 305 V8 Single Cab, Automatic w/overdrive. ... It needs vacuum. image-2020-05-25-15_20_35-460.jpg (254.84 kB, 800x600 - viewed 811 times.) ... I would consult the vacuum line diagram on your core support if you still have one. None of my trucks have that switch because of different transmissions than yours, 21 chevy 350 vacuum diagramVacuum line diagram for 1971 chevy 350 Vacuum diagram 350 chevy lines 1984 sbc wiring schematic carbVacuum diagram chevy van 1986 routing diagrams need sam. Check Details Diagrams gm., Tim's Auto Repair. mechanic. High School or GED. 9,786 satisfied customers. Chevrolet P30 motorhome 1982 chevy P30 motorhome. There is. 1982 chevy P30 motorhome. There is a vacuum delay with four vacuum connections. One side is black and one side red., Hello and good afternoon. I've got a 1972 C10 with 350 and Rochester Quadrajet. I've looked but can't find my set up for the engine vacuum lines. I'm guessing most of the original stuff gets bypassed but I'm trying to restore one. I'm not 100% sure what this is called or it's function but I need to know how to plumb it out., Jan 5, 2010 · the carb line goes to a nipple that is between the throttle plates and the choke plate (so it sees high vacuum for cold starts and closes the snout valve) these vac fittings are small, so even open, they do not change the way a car runs that much. Kevin. 69' SS-350 Convert, M20, 3.31 posi. , As far as the low vacuum reading goes it could be as simple as the timing being slightly retarded or the distributor vacuum advance not working properly. At idle, more ignition timing means more manifold vacuum, at least up to a certain point. Also at 85,000 miles on an untouched SBC it might be time for a new cam timing chain and gear set., The vacuum increases as the throttle are opened. In a car with an automatic trans, the hose is connected to a full-time vacuum port. Full manifold vacuum is present at idle and decreases as the throttle is opened. The port is below the throttle blades. The reason for this is to increase low-speed torque with the increased spark advance.