If the port is truly open to the vacuum, then it will have vacuum. One post on a Holley forum recommended the IAC value to be 10-20% for a manual transmission. May Gods grace bless you in the. This basic manual contains the information necessary for the installation of the throttle body, wiring, and sensors. (66) Make/Engine Basic Operating RPM Range Intake Section Included Throttle Body Bore Size Selected Filters Part Type: Intake Manifolds, Fuel Injected Cylinder Head Configuration: Cathedral Port LS1/LS2/LS6 Filter Results by Vehicle Search New Vehicle Sort Sort By. You can use your HEI distributor without its module as a signal to the Sniper for Timing Control on the green and purple wires by connecting them to the HEI pickup coil wires (watch out for polarity). You can set a fixed timing setting to verify that you are actually getting the spark when it is calling for it. Connect your distributor to one of the 3/16 vacuum ports on the EFI. The sniper should have a fitting on the rear that the instructions label as brake booster. I know the regular version has the regulator on the Sniper unit, but according to fuel line layout with the return-less version that inlet plugged. The Sniper has an internal MAP sensor. 1) Sniper EFI Fabricated LS3 Intake Manifold RPM Power Band: 3,500 – 8,000rpm Intake Runner Length: 5. Low Vacuum on Holley Sniper EFi. In business for over 100 years, it would be an understatement to say that they know what they are doing. Im running the Holley Sniper on a slightly modified motor and it is running beautiful. View Holley Sniper Stealth 4150 - Black Finish Bolt on 2300 Flange Carburetor Replacement Supports up to 350HP with Two 100lb/hr Injectors Equipped with C4 / C6 Ford transmission kickdown lever as well as. And 10 micron filter between the pump and throttle body. Where to Hook Up Vacuum Lines On A Holley Carburetor Holley 137K subscribers Subscribe 911K views 13 years ago Carburetor Installation & Tuning Segments Learn More:. You want the highest port for your distributor. Specs- 350 engine, Edelbrock Performer EPS manifold, Holley 4160, TH350 trans (rebuilt w/shift kit), 3. In a way, why did Holley even provide it, seems silly really, fitting carb replacement EFI and then still having vacuum advance. It is ported into the base of the throttle body so it sees the top of the intake manifold. May Gods grace bless you in the Lord Jesus Christ. Holley Performance Products has written this manual for the installation of the Sniper EFI TBI fuel injection system. Specs- 350 engine, Edelbrock Performer EPS manifold, Holley 4160, TH350 trans (rebuilt w/shift kit), 3. HOLLEY SNIPER EFI TUNING tips, info sharing, ideas>HOLLEY SNIPER EFI TUNING tips, info sharing, ideas. Question I installed my Sniper EFI, but how do I use my kick down for my C4 transmission? Answer. (something like this https://www. Holley Sniper EFI System is Easy, Budget. There is an idle air control valve (IAC) that adjusts air flow beyond what the butterflies do, that contribute to AFR based on throttle position (TPS). I stopped at the transmission place that rebuilt my transmission about a year ago. EFE + EGR Delete for Sniper EFI. The PCV valve gets hooked to manifold vacuum, usually through a fitting on the base of a carburetor. Use this for PCV, power brake etc. 623 lift/114° LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1. 00 Purchase Here: holley. Here Is The Correct Procedure For Setting An. The Holley Sniper EFI has a built in fuel pressure regulator pre set to 58psi so it should (fingers crossed) be a breeze. Most intakes usually have a port in the front and/or rear runners that you could put a fitting into to hook the PCV or power brakes vacuum line to. Good time to switch to a controlled distributor (assuming the Sniper has provisions for it), I went with the GM small cap controlled by my Holley Terminator. Some of the Holley 4150 carburetors, and just about all of the Holley 4500 (Dominator) carbs do not come equipped with the typical pressed-in vacuum port for hooking a PCV valve hose to, as some Holley and other brands of carbs do. On my 670 Avenger I had 4 Vacuum ports, one for the Brake Booster, one for the PCV, one for the distributor and a full vacuum port I used to for the vacuum canister for my heater controls. Can I just cap off the Sniper vacuum port and leave in the manifold? Last edited by ngstahl; 05-09-2020, 08:49 AM. It is located in the north-central region of Venezuela. Vacuum Port Side View Figure. You also have 2 vacuum port holes at the back of the intake. There are vacuum ports on the Sniper TBI unit itself: http://documents. The Holley Sniper intake has 4 vacuum ports on the bottom and Holley gives you aluminum fittings to use. If youre running a spring-loaded PCV valve these can cycle or pulse at idle which makes the Sniper think that it has to compensate for it. com>Holley Carb Vacuum ports. 92 Ford Mustang GT: 385/6. This is why most OEM EFI pumps are in the tank. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. com/i/Edelbrock/350/7501/10002/-1 ) and the picture they had there shows the port that I referred to on the back runner of the intake. Purge signal uses ported vacuum usually routed thru a CTO, so theres no signal at idle or when the engine is cold. Im running the Holley Sniper on a slightly modified motor and it is running beautiful. Ported vacuum would only advance the timing when the throttle plates are open and below the threshold. Vacuum Port Side View Figure 3 6. The Sniper line of fuel pumps, regulators, and filters make Sniper a one-stop shop for a complete fuel system overhaul. Follow along as we make big power out of this 377ci small-block-chevy with bolt-on parts!. Vacuum Port Side View. If it works, the ECU will cut spark at or near 1500 RPM, then you can let us know for certain if it works or not. As I wrap up this upgrade I’m not certain where the best location for the PCV hose. Vacuum Port Side View. This is why most OEM EFI pumps are in the tank. Attach all vacuum lines, where necessary. 550-516D), but not the 4150 Stealth version. There is a good description in the instruction for those ports. Is the Sniper smart enough to allow for either, if say, you are running the system on a 207 cubic inch V6 that may require a lower fuel pressure at idle so the set lower limit of pulse width would allow a proper AFR by using manifold vacuum as the source for the regulator boost port?. I’m trying to make sure the larger threaded port in the front of the Sniper 1250 baseplate (4150, not the Stealth model) is just a plain old manifold vacuum source. where should TH350 actuator vacuum line connect?>where should TH350 actuator vacuum line connect?. Purge line uses manifold vacuum. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. Holley offers a variety of fuel pumps, hoses and accessories to complete your installation. Holley Sniper Vacuum Ports700R-4 ProBuilt, Moser 12 bolt with 3. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. Sniper EFI Tuning & Tech. The vacuum source for this purge signal will come. the same one that the brake power booster is connected to. Purge signal uses ported vacuum usually routed thru a CTO, so theres no signal at idle or when the engine is cold. Disruptions due to flooding are ongoing across northern Maracay, Aragua State, as of Oct. Use one for your power booster and use the other for a multiple vacuum port. Connect the PVC to the 3/8 nipple on the front of the EFI thats designated manifold vacuum/brake. The Sniper Stealth 4150 EFI system from Holley features 4, 100LB/HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. On my 670 Avenger I had 4 Vacuum ports, one for the Brake Booster, one for the PCV, one for the distributor and a full vacuum port I used to for the vacuum canister for my heater controls. what do you mean ported vs manifold? for the vacuum source of the dizzy? I did learn something over at the holley sniper forum -. Vent line from carburetor bowl. Holley Sniper PCV location Cowboy Andy Aug 7, 2021 1 2 Next C Cowboy Andy Farmall Cub Joined Feb 20, 2021 Messages 10 Points 1 Aug 7, 2021 #1 I have installed a 2 barrel Holley Sniper EFI on my 69 Scout 345. For best results, Holley strongly recommends an in-tank pump. The system has a total of 20 minutes of drive time, probably 2-3 hours of idle time between me setting things up and troubleshooting. They looked at it and said the vacuum line should be connected to a vacuum port directly on the manifold, ie. Not the 1/16” port which is used when running a draw through application, the larger port to the driver’s side. Can I use this for a PCV connection? If not, what is its purpose? Thanks!. Is it ported in FRONT of the throttle blade or to the REAR of it? IF its ported to the rear it is manifold vacuum. Top 10 Sniper EFI Installation Tips from Holleys Tom Kise. I looked on Jegs for your intake ( http://www. Holley Sniper PCV location Cowboy Andy Aug 7, 2021 1 2 Next C Cowboy Andy Farmall Cub Joined Feb 20, 2021 Messages 10 Points 1 Aug 7, 2021 #1 I have installed a 2 barrel Holley Sniper EFI on my 69 Scout 345. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. Connect the brake booster to the runner on the intake. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS. 623 lift/114° LSA camshaft, TFS R-Series. It is situated in the central highlands, 1,500 feet (460 metres) above sea level and 70 miles (110 km). At the front of your carb has 2 vacuum ports in the lower baseplate. Holley 137K subscribers Subscribe 911K views 13 years ago Carburetor Installation & Tuning Segments Learn More: https://www. The sniper sets timing based on a MAP and RPM table. Sniper Fabricated Intake Manifold Kits (Carbureted & EFI versions. Apr 15, 2009 #5 O ORANGE77 Veteran Member Jan 17, 2002 779. com Holley is unquestionably a leading name in the world of LS performance parts. An easy test would be to set your rev limit to 1500 RPM and test it. AUTOIMPORT PARTS, LLC in Apopka, FL. Models Jeep CJ Forum Sniper EFI vacuum ports - Is this set up correctly? Evap canister connects? 3689 Views 4 Replies 3 Participants Last post by whollsee , Jan 30, 2020 uw91 Discussion Starter · Jan 21, 2020 I had my mechanic that has installed these before get mine installed, so I relied on his expertise to set this up correctly. Question: There is a threaded plug on the front of the throttle body. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. Question Is the Sniper approved for use in marine applications? Answer Yes, Holley does have Sniper EFI Marine certified applications. com/support/carbur In this video, we cover. 5psi of boost so we teamed up with ProCharger superchargers to put one to the test on Westech Performances engine dyno. Reconnect vac advance, the timing should be around 20 - 24 degrees before top dead center. the same one that the brake power booster. 1 on the left and one on the right but one is higher than the other. They said insufficient vacuum would be causing the late shifts I described. The Sniper EFI System comes with a built in fuel pressure regulator, factory set at 58. Sniper Official Site: Carb to EFI Conversions, Fuel. Vents vapors from the fuel tank into the canister. Connect fuel feed and return hose. Holleys Super Sniper Stealth can support 1,250 horsepower and 21. Of course, All your looking for is a properly sized nipple that has constant vacuum (same as PCV) so rear of carb or where ever will probably do the trick so long as it meets those requirements and if push comes to shove. To recap, I dont mind running it this way on this manual car, but its not my first choice for an automatic car. Product includes all gaskets and hardware for a hassle-free installation The Sniper intake will only accept EV1 style injectors. Most street Holley carburetors position the manifold vacuum port in this location (arrow) on the carburetor mounting base. pdf (Holley Sniper EFI Instruction Manual - See Page 7). This manifold block features 12 1/8th NPT ports that can be plumbed with most common EFI transducers such as the Holley 554-102 0-100 psi transducer. Holley Sniper EFI with HyperSpark, Comp Cams, NOS cheater plate with powershot solenoids. No timing control, no (spark based) Rev Limiter. Yes, the sniper has a timed spark vacuum port that will operate the vacuum advance. The larger tube at the base of the carburetor provides full manifold vacuum at idle. Ditch the Carb and Go EFI with Holley Terminator X Stealth 4500 and 4150. Edelbrock 2176 vacuum source. #1 Vacuum Ports 12-30-2019, 09:20 AM There are three ports on the back of the Sniper. If open and no vacuum then a gasket or something is blocking it. Ford 302 vacuum tree, thermostat housing. holley vacuum port for distributor. Get one with a 3/8 port you can use for the power brakes, and one or two smaller 1/4 ports for the vacuum advance, HVAC, etc. If ping is heard, back the timing down 2 degrees at a time until pinging stops. These ports will provide ample vacuum port sources for both carbureted and EFI. Doug Tags: None Danny Cabral Administrator Join Date: Dec 2009 Posts: 32834 Tweet #2. Engine vacuum low (8 to 10 inHg) at idle. The front ported vacuum port pulls 20 of vacuum, the rear manifold port pulls 7-10 of unsteady vacuum. You can lock out mechanical advance with a simple bar across the advance weight posts instead of springs or like this with screws. You also should vent you PCV and charcoal canister to vac. They looked at it and said the vacuum line should be connected to a vacuum port directly on the manifold, ie. Three vacuum ports are available on the throttle body. Holley Sniper EFI 2300 2BBL HyperSpark Distributor, ECU, and Coil Offenhauser 5585 90° adapter (to line up throttle controls on driver side) Offenhauser 5413A manifold adapter Offenhauser 6208 C-Series Manifold DeLorean Charcoal Canister p/n-101109 Fixed Orifice PCV Valve. Ill use the manifold 3/8 for brake booster, the manifold 3/16 for ignition. Just like a carburetor, the throttle body is fitted with multiple vacuum ports: One large 3/8-inch port for power brakes, a small 3/16-inch . Holley Sniper EFI Intake Manifold 835011. Aragua State (Spanish: Estado Aragua, IPA: [esˈtaðo aˈɾaɣwa]) is one of the 23 states of Venezuela. I have the Holley HyperSpark system, so theres no vacuum advance on that I don’t think. With the idle mixture screw removed, the tapered portion is what adjusts the volume of fuel allowed into the engine. where should TH350 actuator vacuum line connect?. The port on the distributor cap would benefit if you connected it to weak vacuum on the air filter assembly. Lock the distributor, reconnect vac advance to a manifold port or one that pulls vacuum full time even at idle. Heavy rainfall caused the Corozal and El Castano rivers near Henri. If you need another one on the intake manifold, drill & tap for 1/4 NPT on the front or rear of the plenum where the throttle body bolts to. 2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/. Sniper EFI Bolt-on carburetor style EFI for your classic car or truck. Using the Holley EFI software (LINK), look at where the live cursor moves to during this occurrence, and manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing). The Sniper only has 3 ports, A full manifold port (small nipple), brake booster port and one for vacuum advance on the distributor. I had the manifold changed since they did the tranny work, so I cant blame them if its connected wrong. Where to Hook Up Vacuum Lines On A Holley Carburetor Holley 137K subscribers Subscribe 911K views 13 years ago Carburetor Installation & Tuning Segments Learn More:. Quick Question, I noticed the regular Sniper 4150 Sniper is sold with the Returnless Pump by Holley (e. The Holley Sniper intake has 4 vacuum ports on the bottom and Holley gives you aluminum fittings to use. The vacuum ports pickup manifold vacuum from a slot in the casting which has a passage to the throttle bores. The smaller tube attached to the metering block is timed spark (vacuum provided any time after off idle). Avoid using any 90 degree fittings between the tank and pump. When using a Holley dual sync distributor to utilize timing control capabilities does it plug and play with the Sniper EFI? Almost, You will also need the PART# 558-493 adapter that will allow it to plug into the ignition connector on the Sniper harness. When using a Holley dual sync distributor to utilize timing control capabilities does it plug and play with the Sniper EFI? Almost, You will also need the PART# 558-493 adapter that will allow it to plug into the ignition connector on the Sniper harness. com/parts/clp-in38rs/overview/) Then use the large port on the carburetor for your PCV, which is probably a 3/8 hose. Its part#1044 and you can purchase it directly from their website www. Total (initial and centrifugal) as well as load based (vacuum) are built into the table. Not all model 4150’s have vacuum connections, however, some model 4150s are equipped with three vacuum tubes. Im not running a vacuum advance distributor, and my Performer RPM intake already has a vacuum port, so I am assuming theres no need to use any of the three ports on the throttle body?. (54) In Stock, Including at a Supplier. Attach all vacuum lines, where necessary. You will need to connect the Evap can and brake booster vacuum ports here. Holley Sniper Intake and Valve Covers Installed. Please read all the WARNINGS and NOTES, as they contain valuable information that can save you time and money. On my Sniper EFI, there are three vacuum ports in the back. If the trigger is not phased correctly you will be off on everything. 5) ThunderHead289 269K subscribers 121K views 7 years ago Carburetor School - Become a Carb Expert: Understanding Settings &. See Figure 4 for diagram of vacuum ports. Im getting ready to put a Sniper on a customers 67 Mustang, stock 289/C4. An easy test would be to set your rev limit to 1500 RPM and test it. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. Vacuum leaks on any manifold connection can cause issues but often an unsteady MAP reading at idle can be traced to the PCV valve. Going In-Depth With Holleys Terminator X Stealth 4500 EFI System. See Figure 4 for diagram of vacuum ports. The fitting is where the brake booster is currently running into the intake. Installing the fuel pump in the tank results in quieter operation, less chance of cavitation and a. Specs Service Parts Throttle Position Sensor Part# 870001 $38. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. When using a Holley dual sync distributor to utilize timing control capabilities does it plug and play with the Sniper EFI? Almost, You will also need the PART# 558-493 adapter that will allow it to plug into the ignition connector on the Sniper harness. FJ60 Holley Sniper Conversion. Danny Cabral Administrator Join Date: Dec 2009 Posts: 32967 #3 Yesterday, 08:47 AM ABC is correct. Introducing Holley EFI V6 Software Updates. Usually the ported nipple, but the manifold port is ok as well. Manifold vacuum would advance the timing during cranking and anytime the vacuum is below the threshold to operate and overcome the advance system in the distributor. Ships Today. Maracay, city, capital of Aragua estado (state), northern Venezuela. There is an idle air control valve (IAC) that adjusts air flow beyond what the butterflies do, that contribute to AFR based on throttle position (TPS). Brake booster/transmission vacuum question. The numeric IAC value was out of whack (anywhere from 0 to 30%). 72 O-Ring And Mounting Hardware Kit - LS3/L92 Part# 870003 $26. The threaded vacuum port is a 3/8 size, and is made by Performance Stainless Steel. Has anyone had to install stubs or plugs? Im new to the forum and not sure how to add a pic to this thread. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. #1 Vacuum Ports 12-30-2019, 09:20 AM There are three ports on the back of the Sniper. Holley Sniper EFI Long tube headers Tremec TKO 600 13/12 4 wheel disc brakes Truetrac 3:73 Posi Classic a/c Dakota VHX gages Reply Save Like 1 J. Holley>COMPETITION CARBURETORS MODEL 4150 HP SERIES. Note: Fuel pressure should be checked on the inlet fuel line before initial start up during the fuel pump prime. Holley>QUICKSTART MANUAL. As for vacuum, if the provided ports dont work you could use a spacer with a port or use a port directly from the intake. Usually Td into the PCV purge line. Holley Sniper EFI 2300 2BBL HyperSpark Distributor, ECU, and Coil Offenhauser 5585 90° adapter (to line up throttle controls on driver side) (~12Hg). Vacuum Ports, 1/8 and (1) 1/4 Pipe . I often run the PCV to the rear port and then use the fitting on the intake, behind the carb, to hook up the power brakes. So there’s no way that a carburetor spacer will block the vacuum ports. Holley Sniper EFI install. The threaded vacuum port is a 3/8 size, and is made by Performance Stainless Steel. This is no great surprise since these carbs are mostly intended for race applications. The nipple needs to be 3/8 for proper brake function. The other two are at the rear: a 3/16-inch manifold vacuum port and a 3/8 manifold vacuum port that works perfectly as a brake booster source. The first one is a 3/16-inch ported manifold vacuum at the front, perfect for a vacuum advanced distributor connection. Holley Sniper EFI Intake Manifold 835011 Vacuum Port Quantity, None. Remove the plug and attach the vacuum gauge here. Vacuum port for AT almost always comes off an intake port/nipple. Ill use the manifold 3/8 for brake booster, the manifold 3/16 for ignition advance and leave the 3/16 ported capped. The Sniper Stealth 4500 EFI system from Holley features 8, 100LB/HR Fuel Injectors capable of supporting 800 to 1500 HP naturally aspirated, or 800-1250 HP on forced induction applications. Sniper EFI Bolt-on carburetor style EFI for your classic car or truck. We recommend at least a 3/8” feed line and 3/8” return line. The 3/8 vacuum port stub came from the factory capped, but the two smaller vacuum ports are open with no tube stubs or plugs. The vacuum ports, all on the secondary side clean up the look, but placing the ported spark on the secondary, even at 1:1 has got to be late compared to the fitting being on the primary side where it SHOULD be. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Yes, you can use the PCV and power brake vacuum ports interchangably if you want. Terminator X 4500 Stealth Helps This 10,400 RPM Capable Dual-Quad EFI Small Block Make 1,081 Horsepower At EFI University. The Sniper EFI System comes with a built in fuel pressure regulator, factory set at 58. Not all model 4150’s have vacuum connections, however, some model 4150s are equipped with three vacuum tubes. Determine where the port enters an area where it will be exposed to vacuum. Both are full vacuum and it doesnt make any difference if its near the primaries or secondary side. No other vacuum lines needed except your brake booster. If youre not using power brakes (or if you have the booster plumbed to the intake manifold), use that one for your PCV hookup. The companys filing status is listed as Active and its File Number is. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. The Sniper line of products are built to take your project to a new level of performance at a great price! Sniper plumbing is high-performance equipment with hand-polished aluminum fittings and high–strength hoses. insights into running manifold vs ported vacuum to settle and disputes. Now see if that area is blocked by a gasket or part of the intake. I chose not to use the aluminum fittings and purchased brass fittings to use instead. The Sniper line of products are built to take your project to a new level of performance at a great price! Sniper plumbing is high-performance equipment with hand-polished aluminum fittings and high-strength hoses. Intake Manifolds, Fuel Injected. The Sniper Stealth 4500 also features multiple Input and Output options for sensor inputs and switched outputs to control external relays. XFlow does not have a ported vacuum port that would typically be used with a vacuum advance distributor. I’m trying to make sure the larger threaded port in the front of the Sniper 1250 baseplate (4150, not the Stealth model) is just a plain old manifold vacuum source. com/parts/PRS-1044/ See more 6 Reply Save Like 1 - 15 of 15 Posts BillyGman Discussion Starter · #2 · Nov 21, 2010. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS PART 1. AUTOIMPORT PARTS, LLC is a Florida Domestic Limited-Liability Company filed on March 19, 2019. The sniper sets timing based on a MAP and RPM table. Models Jeep CJ Forum Sniper EFI vacuum ports - Is this set up correctly? Evap canister connects? 3689 Views 4 Replies 3 Participants Last post by whollsee , Jan. When using a Holley dual sync distributor to utilize timing control capabilities does it plug and play with the Sniper EFI? Almost, You will also need the PART# 558-493 adapter. Yes, the sniper has a timed spark vacuum port that will operate the vacuum . Holley Sniper EFI 2300 2BBL HyperSpark Distributor, ECU, and Coil Offenhauser 5585 90° adapter (to line up throttle controls on driver side) Offenhauser 5413A manifold adapter Offenhauser 6208 C-Series Manifold DeLorean Charcoal Canister p/n-101109 Fixed Orifice PCV Valve. Capability Range: Moderate Price Point: $ 1 & 2 Barrel 2300 EFI System BBD EFI System 2GC EFI System Autolite 1100 EFI System 4 Barrel Sniper 4150 EFI Super Sniper EFI Sniper XFlow EFI Sniper Quadrajet EFI 4 Barrel STEALTH Stealth 4150 EFI Stealth Super Sniper Stealth 4500 EFI. Most street Holley carburetors position the manifold vacuum port in this location (arrow) on the carburetor mounting base. If you have what you need coming out of the intake then you can just keep them capped with the caps they shipped the unit with. See Figure 3 for diagram of vacuum ports. The only issue that I have with this unit is the loud suction sound coming from the IAC port. Finding a tough to find vacuum leak?. As for vacuum, if the provided ports dont work you could use a spacer with a port or use a port directly from the intake. The FRONT port (plugged) peeks out UNDER the throttle blades (manifold). Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. No Vacuum Advance with Progressive?. com or do what I did, and go to http://www. Lock the distributor, reconnect vac advance to a manifold port or one that pulls vacuum full time even at idle. Holley Performance Products has written this manual for the installation of the Sniper EFI TBI fuel injection system. At the front of your carb has 2 vacuum ports in the lower baseplate. So the rear vacuum advance port is the only one. One post on a Holley forum recommended the IAC value to be 10-20% for a manual transmission. It gets hot in there and condensation will make problems in your distributor otherwise. I find the most helpful datalog function, is overlaying the datalog on your GCF. Two 3/16 and one 3/8 for vacuum manifold, booster & distributor respectively. Tags: None AndyF Senior Member Join Date: Mar 2017 Posts: 3883 Share Tweet #2 11-26-2020, 12:18 PM. Sniper ported vacuum issue. Holley Performance Products Forums>Erratic AFR?. Is the Sniper smart enough to allow for either, if say, you are running the system on a 207 cubic inch V6 that may require a lower fuel pressure at idle so the set lower limit of pulse width would allow a proper AFR by using manifold vacuum as the source for the regulator boost port?. 05-09-2020, 08:36 AM Setting up now, I have a fitting in the back of the manifold blocking the brake booster vacuum port on the Sniper. Where to Hook Up Vacuum Lines On A Holley Carburetor. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS PART 1. 44 Idle Air Control Motor Part# 543-105 $71.