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. Determine where the port enters an area where it will be exposed to vacuum. The first one is a 3/16-inch ported manifold vacuum at the front, perfect for a vacuum advanced distributor connection. com/parts/PRS-1044/ See more 6 Reply Save Like 1 - 15 of 15 Posts BillyGman Discussion Starter · #2 · Nov 21, 2010. Connect the PVC to the 3/8 nipple on the front of the EFI thats designated manifold vacuum/brake. You will need to connect the Evap can and brake booster vacuum ports here. Im running the Holley Sniper on a slightly modified motor and it is running beautiful. Two 3/16 and one 3/8 for vacuum manifold, booster & distributor respectively. The Sniper EFI Stealth 4150 Supports Big Power But Remains. #1 Vacuum Ports 12-30-2019, 09:20 AM There are three ports on the back of the Sniper. Holley Performance Products has written this manual for the installation of the Sniper EFI TBI fuel injection system. May Gods grace bless you in the. 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. Product includes all gaskets and hardware for a hassle-free installation The Sniper intake will only accept EV1 style injectors. 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). Attach all vacuum lines, where necessary. Holley 137K subscribers Subscribe 911K views 13 years ago Carburetor Installation & Tuning Segments Learn More: https://www. 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. Holley Sniper EFI Installation Tips and Tricks. Holley offers a variety of fuel pumps, hoses and accessories to complete your installation. 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. 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. In a way, why did Holley even provide it, seems silly really, fitting carb replacement EFI and then still having vacuum advance. Doug Tags: None Danny Cabral Administrator Join Date: Dec 2009 Posts: 32834 Tweet #2. New Sniper install, PCV valve question. (something like this https://www. I find the most helpful datalog function, is overlaying the datalog on your GCF. 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). It gets hot in there and condensation will make problems in your distributor otherwise. Most street Holley carburetors position the manifold vacuum port in this location (arrow) on the carburetor mounting base. Attach all vacuum lines, where necessary. Three vacuum ports are available on the throttle body. the same one that the brake power booster is connected to. com Holley is unquestionably a leading name in the world of LS performance parts. Introducing Holley EFI V6 Software Updates. Im getting ready to put a Sniper on a customers 67 Mustang, stock 289/C4. 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. 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. Lock the distributor, reconnect vac advance to a manifold port or one that pulls vacuum full time even at idle. Vacuum port for AT almost always comes off an intake port/nipple. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. They said insufficient vacuum would be causing the late shifts I described. It is ported into the base of the throttle body so it sees the top of the intake manifold. Ill use the manifold 3/8 for brake booster, the manifold 3/16 for ignition advance and leave the 3/16 ported capped. Now see if that area is blocked by a gasket or part of the intake. 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?. 700R-4 ProBuilt, Moser 12 bolt with 3. Yes, the sniper has a timed spark vacuum port that will operate the vacuum . 44 Idle Air Control Motor Part# 543-105 $71. 1) Sniper EFI Fabricated LS3 Intake Manifold RPM Power Band: 3,500 – 8,000rpm Intake Runner Length: 5. 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. The Holley Sniper EFI has a built in fuel pressure regulator pre set to 58psi so it should (fingers crossed) be a breeze. The nipple needs to be 3/8 for proper brake function. The numeric IAC value was out of whack (anywhere from 0 to 30%). I chose not to use the aluminum fittings and purchased brass fittings to use instead. In business for over 100 years, it would be an understatement to say that they know what they are doing. It is situated in the central highlands, 1,500 feet (460 metres) above sea level and 70 miles (110 km). You also should vent you PCV and charcoal canister to vac. See Figure 3 for diagram of vacuum ports. Yes, you can use the PCV and power brake vacuum ports interchangably if you want. 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. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. 72 O-Ring And Mounting Hardware Kit - LS3/L92 Part# 870003 $26. The Sniper has an internal MAP sensor. 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. One post on a Holley forum recommended the IAC value to be 10-20% for a manual transmission. Not all model 4150’s have vacuum connections, however, some model 4150s are equipped with three vacuum tubes. They looked at it and said the vacuum line should be connected to a vacuum port directly on the manifold, ie. insights into running manifold vs ported vacuum to settle and disputes. If the trigger is not phased correctly you will be off on everything. See Figure 4 for diagram of vacuum ports. May Gods grace bless you in the Lord Jesus Christ. Vacuum Port Side View. New install, AMC 360, runs bad, datalogs. Connect fuel feed and return hose. Total (initial and centrifugal) as well as load based (vacuum) are built into the table. 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. The sniper sets timing based on a MAP and RPM table. 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. Holley>QUICKSTART MANUAL. Sniper EFI Bolt-on carburetor style EFI for your classic car or truck. You want the highest port for your distributor. This is why most OEM EFI pumps are in the tank. Reconnect vac advance, the timing should be around 20 - 24 degrees before top dead center. Not all model 4150’s have vacuum connections, however, some model 4150s are equipped with three vacuum tubes. I had the manifold changed since they did the tranny work, so I cant blame them if its connected wrong. 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. 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). This is why most OEM EFI pumps are in the tank. The fitting is where the brake booster is currently running into the intake. I looked on Jegs for your intake ( http://www. Question Is the Sniper approved for use in marine applications? Answer Yes, Holley does have Sniper EFI Marine certified applications. Holley Performance Products has written this manual for the installation of the Sniper EFI TBI fuel injection system. Chevy LS3 Intake Manifold Upgrade Guide. It is located in the north-central region of Venezuela. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. 92 Ford Mustang GT: 385/6. Holley Sniper EFI 822242 Sniper EFI Fabricated Intake. Purge signal uses ported vacuum usually routed thru a CTO, so theres no signal at idle or when the engine is cold. I have the Holley HyperSpark system, so theres no vacuum advance on that I don’t think. Sniper ported vacuum issue. At the front of your carb has 2 vacuum ports in the lower baseplate. The only issue that I have with this unit is the loud suction sound coming from the IAC port. Vacuum Port Side View Figure 3 6. COMPETITION CARBURETORS MODEL 4150 HP SERIES. There is a good description in the instruction for those ports. what do you mean ported vs manifold? for the vacuum source of the dizzy? I did learn something over at the holley sniper forum -. Holley 820111 Silver Low Profile Sniper EFI Sheet Metal Fabricated Int. Remove the plug and attach the vacuum gauge here. Vent line from carburetor bowl. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. 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. 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. 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. No timing control, no (spark based) Rev Limiter. Use one for your power booster and use the other for a multiple vacuum port. The port on the distributor cap would benefit if you connected it to weak vacuum on the air filter assembly. 5psi of boost so we teamed up with ProCharger superchargers to put one to the test on Westech Performances engine dyno. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. The PCV valve gets hooked to manifold vacuum, usually through a fitting on the base of a carburetor. The smaller tube attached to the metering block is timed spark (vacuum provided any time after off idle). Holley Sniper EFI with HyperSpark, Comp Cams, NOS cheater plate with powershot solenoids. Disruptions due to flooding are ongoing across northern Maracay, Aragua State, as of Oct. Vacuum Ports, 1/8 and (1) 1/4 Pipe . Sniper EFI Tuning & Tech. 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. Purge signal uses ported vacuum usually routed thru a CTO, so theres no signal at idle or when the engine is cold. Finding a tough to find vacuum leak?. Usually Td into the PCV purge line. Sniper EFI Bolt-on carburetor style EFI for your classic car or truck. #1 Vacuum Ports 12-30-2019, 09:20 AM There are three ports on the back of the Sniper. The Sniper Stealth 4500 also features multiple Input and Output options for sensor inputs and switched outputs to control external relays. Yes, the sniper has a timed spark vacuum port that will operate the vacuum advance. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. Quick Question, I noticed the regular Sniper 4150 Sniper is sold with the Returnless Pump by Holley (e. Connect your distributor to one of the 3/16 vacuum ports on the EFI. Specs Service Parts Throttle Position Sensor Part# 870001 $38. Can I use this for a PCV connection? If not, what is its purpose? Thanks!. Specs- 350 engine, Edelbrock Performer EPS manifold, Holley 4160, TH350 trans (rebuilt w/shift kit), 3. The companys filing status is listed as Active and its File Number is. Holleys Super Sniper Stealth can support 1,250 horsepower and 21. com or do what I did, and go to http://www. 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. You can lock out mechanical advance with a simple bar across the advance weight posts instead of springs or like this with screws. Purge line uses manifold vacuum. 623 lift/114° LSA camshaft, TFS R-Series. 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. 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. Vacuum Port Side View. 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. Question I installed my Sniper EFI, but how do I use my kick down for my C4 transmission? Answer. 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). 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. Vacuum port for AT almost always comes off an intake port/nipple. 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. com>Holley Carb Vacuum ports. The Sniper EFI System comes with a built in fuel pressure regulator, factory set at 58. The front ported vacuum port pulls 20 of vacuum, the rear manifold port pulls 7-10 of unsteady vacuum. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. Sniper Official Site: Carb to EFI Conversions, Fuel. pdf (Holley Sniper EFI Instruction Manual - See Page 7). Sniper Fabricated Intake Manifold Kits (Carbureted & EFI versions. FJ60 Holley Sniper Conversion. 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. This basic manual contains the information necessary for the installation of the throttle body, wiring, and sensors. Intake Manifolds, Fuel Injected. 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. The threaded vacuum port is a 3/8 size, and is made by Performance Stainless Steel. Adding a PCV vacuum port to Holley carbs. EFE + EGR Delete for Sniper EFI. 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 . where should TH350 actuator vacuum line connect?. The Sniper EFI System comes with a built in fuel pressure regulator, factory set at 58. Engine vacuum low (8 to 10 inHg) at idle. An easy test would be to set your rev limit to 1500 RPM and test it. Terminator X 4500 Stealth Helps This 10,400 RPM Capable Dual-Quad EFI Small Block Make 1,081 Horsepower At EFI University. Please read all the WARNINGS and NOTES, as they contain valuable information that can save you time and money. Question: There is a threaded plug on the front of the throttle body. The Sniper line of fuel pumps, regulators, and filters make Sniper a one-stop shop for a complete fuel system overhaul. The larger tube at the base of the carburetor provides full manifold vacuum at idle. 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. 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. 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. Aragua State (Spanish: Estado Aragua, IPA: [esˈtaðo aˈɾaɣwa]) is one of the 23 states of Venezuela. AUTOIMPORT PARTS, LLC in Apopka, FL. With the idle mixture screw removed, the tapered portion is what adjusts the volume of fuel allowed into the engine. Usually the ported nipple, but the manifold port is ok as well. Its part#1044 and you can purchase it directly from their website www. The Correct Procedure For Setting An. Both are full vacuum and it doesnt make any difference if its near the primaries or secondary side. Vacuum Port Side View Figure. Installing the fuel pump in the tank results in quieter operation, less chance of cavitation and a. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. So there’s no way that a carburetor spacer will block the vacuum ports. XFlow does not have a ported vacuum port that would typically be used with a vacuum advance distributor. Has anyone had to install stubs or plugs? Im new to the forum and not sure how to add a pic to this thread. These ports will provide ample vacuum port sources for both carbureted and EFI. You can set a fixed timing setting to verify that you are actually getting the spark when it is calling for it. Follow along as we make big power out of this 377ci small-block-chevy with bolt-on parts!. Going In-Depth With Holleys Terminator X Stealth 4500 EFI System. Holley Sniper EFI port ??. 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:. Apr 15, 2009 #5 O ORANGE77 Veteran Member Jan 17, 2002 779. Need a vacuum source for the PCV and power brakes. Holley Sniper Intake and Valve Covers Installed. Ill use the manifold 3/8 for brake booster, the manifold 3/16 for ignition. If open and no vacuum then a gasket or something is blocking it. Can I just cap off the Sniper vacuum port and leave in the manifold? Last edited by ngstahl; 05-09-2020, 08:49 AM. For best results, Holley strongly recommends an in-tank pump. We recommend at least a 3/8” feed line and 3/8” return line. The sniper sets timing based on a MAP and RPM table. To recap, I dont mind running it this way on this manual car, but its not my first choice for an automatic car. 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?. The sniper should have a fitting on the rear that the instructions label as brake booster. 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. 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:. 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. At the front of your carb has 2 vacuum ports in the lower baseplate. Connect the brake booster to the runner on the intake. Specs- 350 engine, Edelbrock Performer EPS manifold, Holley 4160, TH350 trans (rebuilt w/shift kit), 3. Sniper Official Site: Carb to EFI Conversions, Fuel Systems. (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. I stopped at the transmission place that rebuilt my transmission about a year ago. Ported vacuum would only advance the timing when the throttle plates are open and below the threshold. Holley Sniper Vacuum Ports623 lift/114° LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1. View Holley Sniper EFI Self-Tuning Kit - Shiny Finish Bolt on 4150 Flange Carburetor Replacement Throttle body mounted ECU – no extra boxes to mount Supports up to 650hp with Four 100 Lb/Hr Injectors! All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. Top 10 Sniper EFI Installation Tips from Holleys Tom Kise. 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. 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. Holley Sniper EFI Intake Manifold 835011 Vacuum Port Quantity, None. 1 on the left and one on the right but one is higher than the other. So the rear vacuum advance port is the only one. Use this for PCV, power brake etc. If ping is heard, back the timing down 2 degrees at a time until pinging stops. 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. the same one that the brake power booster. 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. Holley Sniper EFI Intake Manifold 835011. As I wrap up this upgrade I’m not certain where the best location for the PCV hose. com/parts/clp-in38rs/overview/) Then use the large port on the carburetor for your PCV, which is probably a 3/8 hose. 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. The vacuum source for this purge signal will come. 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/. They looked at it and said the vacuum line should be connected to a vacuum port directly on the manifold, ie. Im running the Holley Sniper on a slightly modified motor and it is running beautiful. Danny Cabral Administrator Join Date: Dec 2009 Posts: 32967 #3 Yesterday, 08:47 AM ABC is correct. The Holley Sniper intake has 4 vacuum ports on the bottom and Holley gives you aluminum fittings to use. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS. com/support/carbur In this video, we cover. This is no great surprise since these carbs are mostly intended for race applications. Vents vapors from the fuel tank into the canister. HOLLEY SNIPER EFI TUNING tips, info sharing, ideas>HOLLEY SNIPER EFI TUNING tips, info sharing, ideas. Note: Fuel pressure should be checked on the inlet fuel line before initial start up during the fuel pump prime. Ships Today. You also have 2 vacuum port holes at the back of the intake. Lock the distributor, reconnect vac advance to a manifold port or one that pulls vacuum full time even at idle. Ford 302 vacuum tree, thermostat housing. 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. The FRONT port (plugged) peeks out UNDER the throttle blades (manifold). 5) ThunderHead289 269K subscribers 121K views 7 years ago Carburetor School - Become a Carb Expert: Understanding Settings &. Heavy rainfall caused the Corozal and El Castano rivers near Henri. There are vacuum ports on the Sniper TBI unit itself: http://documents. One post on a Holley forum recommended the IAC value to be 10-20% for a manual transmission. 550-516D), but not the 4150 Stealth version. The vacuum ports pickup manifold vacuum from a slot in the casting which has a passage to the throttle bores. Avoid using any 90 degree fittings between the tank and pump. 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. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS PART 1. No other vacuum lines needed except your brake booster. (54) In Stock, Including at a Supplier. 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 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. 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. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. Tags: None AndyF Senior Member Join Date: Mar 2017 Posts: 3883 Share Tweet #2 11-26-2020, 12:18 PM. On my Sniper EFI, there are three vacuum ports in the back. The Holley Sniper intake has 4 vacuum ports on the bottom and Holley gives you aluminum fittings to use. Not the 1/16” port which is used when running a draw through application, the larger port to the driver’s side. 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. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Holley Sniper EFI 2300 2BBL HyperSpark Distributor, ECU, and Coil Offenhauser 5585 90° adapter (to line up throttle controls on driver side) (~12Hg). See Figure 4 for diagram of vacuum ports. 00 Purchase Here: holley. If youre not using power brakes (or if you have the booster plumbed to the intake manifold), use that one for your PCV hookup. 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. Ditch the Carb and Go EFI with Holley Terminator X Stealth 4500 and 4150. AUTOIMPORT PARTS, LLC is a Florida Domestic Limited-Liability Company filed on March 19, 2019. The threaded vacuum port is a 3/8 size, and is made by Performance Stainless Steel. And 10 micron filter between the pump and throttle body. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS PART 1. The Sniper only has 3 ports, A full manifold port (small nipple), brake booster port and one for vacuum advance on the distributor. Vacuum leaks on any manifold connection can cause issues but often an unsteady MAP reading at idle can be traced to the PCV valve. 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. If the port is truly open to the vacuum, then it will have vacuum. Most street Holley carburetors position the manifold vacuum port in this location (arrow) on the carburetor mounting base. 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.