The smaller tube attached to the metering block is timed spark (vacuum provided any time after off idle). 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. Ill use the manifold 3/8 for brake booster, the manifold 3/16 for ignition advance and leave the 3/16 ported capped. Not all model 4150’s have vacuum connections, however, some model 4150s are equipped with three vacuum tubes. The Sniper line of fuel pumps, regulators, and filters make Sniper a one-stop shop for a complete fuel system overhaul. If the port is truly open to the vacuum, then it will have vacuum. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. 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. On my Sniper EFI, there are three vacuum ports in the back. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. I have the Holley HyperSpark system, so theres no vacuum advance on that I don’t think. The FRONT port (plugged) peeks out UNDER the throttle blades (manifold). 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). 700R-4 ProBuilt, Moser 12 bolt with 3. com/parts/clp-in38rs/overview/) Then use the large port on the carburetor for your PCV, which is probably a 3/8 hose. 5psi of boost so we teamed up with ProCharger superchargers to put one to the test on Westech Performances engine dyno. Sniper EFI Bolt-on carburetor style EFI for your classic car or truck. Two 3/16 and one 3/8 for vacuum manifold, booster & distributor respectively. 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. Holley Performance Products has written this manual for the installation of the Sniper EFI TBI fuel injection system. Sniper EFI Bolt-on carburetor style EFI for your classic car or truck. If ping is heard, back the timing down 2 degrees at a time until pinging stops. Quick Question, I noticed the regular Sniper 4150 Sniper is sold with the Returnless Pump by Holley (e. 623 lift/114° LSA camshaft, TFS R-Series. (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. The Sniper EFI System comes with a built in fuel pressure regulator, factory set at 58. Apr 15, 2009 #5 O ORANGE77 Veteran Member Jan 17, 2002 779. Vacuum Port Side View Figure. You also have 2 vacuum port holes at the back of the intake. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS PART 1. Yes, the sniper has a timed spark vacuum port that will operate the vacuum advance. The front ported vacuum port pulls 20 of vacuum, the rear manifold port pulls 7-10 of unsteady vacuum. So there’s no way that a carburetor spacer will block the vacuum ports. Remove the plug and attach the vacuum gauge here. It is located in the north-central region of Venezuela. If open and no vacuum then a gasket or something is blocking it. 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. They said insufficient vacuum would be causing the late shifts I described. Holley Sniper EFI Installation Tips and Tricks. The threaded vacuum port is a 3/8 size, and is made by Performance Stainless Steel. Engine vacuum low (8 to 10 inHg) at idle. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. AUTOIMPORT PARTS, LLC is a Florida Domestic Limited-Liability Company filed on March 19, 2019. Adding a PCV vacuum port to Holley carbs. Disruptions due to flooding are ongoing across northern Maracay, Aragua State, as of Oct. Vacuum Port Side View. The vacuum ports pickup manifold vacuum from a slot in the casting which has a passage to the throttle bores. Holley Sniper PCV location. Not the 1/16” port which is used when running a draw through application, the larger port to the driver’s side. Product includes all gaskets and hardware for a hassle-free installation The Sniper intake will only accept EV1 style injectors. 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. Most street Holley carburetors position the manifold vacuum port in this location (arrow) on the carburetor mounting base. 623 lift/114° LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. insights into running manifold vs ported vacuum to settle and disputes. Aragua State (Spanish: Estado Aragua, IPA: [esˈtaðo aˈɾaɣwa]) is one of the 23 states of Venezuela. AUTOIMPORT PARTS, LLC in Apopka, FL. 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. 72 O-Ring And Mounting Hardware Kit - LS3/L92 Part# 870003 $26. The Sniper has an internal MAP sensor. No Vacuum Advance with Progressive?. 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. Danny Cabral Administrator Join Date: Dec 2009 Posts: 32967 #3 Yesterday, 08:47 AM ABC is correct. com Holley is unquestionably a leading name in the world of LS performance parts. They looked at it and said the vacuum line should be connected to a vacuum port directly on the manifold, ie. Purge signal uses ported vacuum usually routed thru a CTO, so theres no signal at idle or when the engine is cold. 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. Holley Sniper Intake and Valve Covers Installed. With the idle mixture screw removed, the tapered portion is what adjusts the volume of fuel allowed into the engine. The companys filing status is listed as Active and its File Number is. Use this for PCV, power brake etc. 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). 5) ThunderHead289 269K subscribers 121K views 7 years ago Carburetor School - Become a Carb Expert: Understanding Settings &. At the front of your carb has 2 vacuum ports in the lower baseplate. #1 Vacuum Ports 12-30-2019, 09:20 AM There are three ports on the back of the Sniper. An easy test would be to set your rev limit to 1500 RPM and test it. 1) Sniper EFI Fabricated LS3 Intake Manifold RPM Power Band: 3,500 – 8,000rpm Intake Runner Length: 5. Now see if that area is blocked by a gasket or part of the intake. Question: There is a threaded plug on the front of the throttle body. Ditch the Carb and Go EFI with Holley Terminator X Stealth 4500 and 4150. The Holley Sniper intake has 4 vacuum ports on the bottom and Holley gives you aluminum fittings to use. Specs Service Parts Throttle Position Sensor Part# 870001 $38. Vent line from carburetor bowl. com>Holley Carb Vacuum ports. Vacuum Port Side View. If youre not using power brakes (or if you have the booster plumbed to the intake manifold), use that one for your PCV hookup. We recommend at least a 3/8” feed line and 3/8” return line. Yes, the sniper has a timed spark vacuum port that will operate the vacuum . Ill use the manifold 3/8 for brake booster, the manifold 3/16 for ignition. One post on a Holley forum recommended the IAC value to be 10-20% for a manual transmission. Lock the distributor, reconnect vac advance to a manifold port or one that pulls vacuum full time even at idle. If the trigger is not phased correctly you will be off on everything. 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. 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. At the front of your carb has 2 vacuum ports in the lower baseplate. FJ60 Holley Sniper Conversion. 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. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. 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. You can set a fixed timing setting to verify that you are actually getting the spark when it is calling for it. Holley Sniper 4150 Stealth & Returnless. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. These ports will provide ample vacuum port sources for both carbureted and EFI. Where to Hook Up Vacuum Lines On A Holley Carburetor. Holley offers a variety of fuel pumps, hoses and accessories to complete your installation. New Sniper install, PCV valve question. HOLLEY SNIPER EFI TUNING tips, info sharing, ideas. 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. Not all model 4150’s have vacuum connections, however, some model 4150s are equipped with three vacuum tubes. 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. I find the most helpful datalog function, is overlaying the datalog on your GCF. Maracay, city, capital of Aragua estado (state), northern Venezuela. Sniper EFI Tuning & Tech. Usually Td into the PCV purge line. Ford 302 vacuum tree, thermostat housing. 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 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. This is why most OEM EFI pumps are in the tank. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS. Finding a tough to find vacuum leak?. Usually the ported nipple, but the manifold port is ok as well. Holley Sniper EFI with HyperSpark, Comp Cams, NOS cheater plate with powershot solenoids. XFlow does not have a ported vacuum port that would typically be used with a vacuum advance distributor. 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. 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. Vacuum Ports, 1/8 and (1) 1/4 Pipe . Both are full vacuum and it doesnt make any difference if its near the primaries or secondary side. what do you mean ported vs manifold? for the vacuum source of the dizzy? I did learn something over at the holley sniper forum -. The nipple needs to be 3/8 for proper brake function. The Holley Sniper intake has 4 vacuum ports on the bottom and Holley gives you aluminum fittings to use. And 10 micron filter between the pump and throttle body. See Figure 4 for diagram of vacuum ports. This basic manual contains the information necessary for the installation of the throttle body, wiring, and sensors. The threaded vacuum port is a 3/8 size, and is made by Performance Stainless Steel. 00 Purchase Here: holley. An easy test would be to set your rev limit to 1500 RPM and test it. Venezuela: Disruptions due to flooding ongoing north of Maracay, …. So the rear vacuum advance port is the only one. 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. 550-516D), but not the 4150 Stealth version. There is a good description in the instruction for those ports. Connect fuel feed and return hose. Vacuum port for AT almost always comes off an intake port/nipple. No timing control, no (spark based) Rev Limiter. Chevy LS3 Intake Manifold Upgrade Guide. 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?. 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 same one that the brake power booster is connected to. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. The larger tube at the base of the carburetor provides full manifold vacuum at idle. Holley Performance Products Forums>Rev Limiter. Sniper Fabricated Intake Manifold Kits (Carbureted & EFI versions. 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. The sniper sets timing based on a MAP and RPM table. Holley Sniper EFI 822242 Sniper EFI Fabricated Intake. 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. 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. Need a vacuum source for the PCV and power brakes. See Figure 4 for diagram of vacuum ports. For best results, Holley strongly recommends an in-tank pump. Its part#1044 and you can purchase it directly from their website www. Reconnect vac advance, the timing should be around 20 - 24 degrees before top dead center. HOLLEY SNIPER EFI TUNING tips, info sharing, ideas>HOLLEY SNIPER EFI TUNING tips, info sharing, ideas. 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:. 1 on the left and one on the right but one is higher than the other. Tags: None AndyF Senior Member Join Date: Mar 2017 Posts: 3883 Share Tweet #2 11-26-2020, 12:18 PM. The sniper sets timing based on a MAP and RPM table. Question Is the Sniper approved for use in marine applications? Answer Yes, Holley does have Sniper EFI Marine certified applications. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS PART 1. Sniper ported vacuum issue. 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. the same one that the brake power booster. It is situated in the central highlands, 1,500 feet (460 metres) above sea level and 70 miles (110 km). mechanic told me to not use a vacuum hose from distributor to EFI. Vacuum Lines On A Holley Carburetor>Where to Hook Up Vacuum Lines On A Holley Carburetor. Please read all the WARNINGS and NOTES, as they contain valuable information that can save you time and money. Low Vacuum on Holley Sniper EFi. Has anyone had to install stubs or plugs? Im new to the forum and not sure how to add a pic to this thread. Most street Holley carburetors position the manifold vacuum port in this location (arrow) on the carburetor mounting base. 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 . Vacuum port for AT almost always comes off an intake port/nipple. The first one is a 3/16-inch ported manifold vacuum at the front, perfect for a vacuum advanced distributor connection. 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. The fitting is where the brake booster is currently running into the intake. Specs- 350 engine, Edelbrock Performer EPS manifold, Holley 4160, TH350 trans (rebuilt w/shift kit), 3. 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. 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 port on the distributor cap would benefit if you connected it to weak vacuum on the air filter assembly. Holleys Super Sniper Stealth can support 1,250 horsepower and 21. COMPETITION CARBURETORS MODEL 4150 HP SERIES. Ships Today. where should TH350 actuator vacuum line connect?. 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. Edelbrock 2176 vacuum source. The numeric IAC value was out of whack (anywhere from 0 to 30%). (something like this https://www. com/parts/PRS-1044/ See more 6 Reply Save Like 1 - 15 of 15 Posts BillyGman Discussion Starter · #2 · Nov 21, 2010. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. One post on a Holley forum recommended the IAC value to be 10-20% for a manual transmission. Going In-Depth With Holleys Terminator X Stealth 4500 EFI System. You will need to connect the Evap can and brake booster vacuum ports here. Here Is The Correct Procedure For Setting An. You can lock out mechanical advance with a simple bar across the advance weight posts instead of springs or like this with screws. 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?. The Sniper EFI System comes with a built in fuel pressure regulator, factory set at 58. Avoid using any 90 degree fittings between the tank and pump. The Sniper Stealth 4500 also features multiple Input and Output options for sensor inputs and switched outputs to control external relays. 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. 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. Three vacuum ports are available on the throttle body. Im getting ready to put a Sniper on a customers 67 Mustang, stock 289/C4. Holley 137K subscribers Subscribe 911K views 13 years ago Carburetor Installation & Tuning Segments Learn More: https://www. I stopped at the transmission place that rebuilt my transmission about a year ago. You also should vent you PCV and charcoal canister to vac. 92 Ford Mustang GT: 385/6. I had the manifold changed since they did the tranny work, so I cant blame them if its connected wrong. Vacuum leaks on any manifold connection can cause issues but often an unsteady MAP reading at idle can be traced to the PCV valve. You want the highest port for your distributor. Connect the brake booster to the runner on the intake. The sniper should have a fitting on the rear that the instructions label as brake booster. 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:. No other vacuum lines needed except your brake booster. #1 Vacuum Ports 12-30-2019, 09:20 AM There are three ports on the back of the Sniper. Holley Sniper EFI 2300 2BBL HyperSpark Distributor, ECU, and Coil Offenhauser 5585 90° adapter (to line up throttle controls on driver side) (~12Hg). Vents vapors from the fuel tank into the canister. 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. They looked at it and said the vacuum line should be connected to a vacuum port directly on the manifold, ie. 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/. See Figure 3 for diagram of vacuum ports. Holley Performance Products has written this manual for the installation of the Sniper EFI TBI fuel injection system. pdf (Holley Sniper EFI Instruction Manual - See Page 7). com>Holley Sniper EFI Installation Tips and Tricks. Can I use this for a PCV connection? If not, what is its purpose? Thanks!. Intake Manifolds, Fuel Injected. 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 or do what I did, and go to http://www. 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. 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. In business for over 100 years, it would be an understatement to say that they know what they are doing. I looked on Jegs for your intake ( http://www. Introducing Holley EFI V6 Software Updates. Connect your distributor to one of the 3/16 vacuum ports on the EFI. 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. Heavy rainfall caused the Corozal and El Castano rivers near Henri. May Gods grace bless you in the Lord Jesus Christ. Holley Sniper EFI Intake Manifold 835011. 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. 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. Holley Performance Products Forums>Erratic AFR?. Brake booster/transmission vacuum question. (54) In Stock, Including at a Supplier. Holley Sniper EFI Intake Manifold 835011 Vacuum Port Quantity, None. Total (initial and centrifugal) as well as load based (vacuum) are built into the table. Lock the distributor, reconnect vac advance to a manifold port or one that pulls vacuum full time even at idle. May Gods grace bless you in the. The Holley Sniper EFI has a built in fuel pressure regulator pre set to 58psi so it should (fingers crossed) be a breeze. holley vacuum port for distributor. Specs- 350 engine, Edelbrock Performer EPS manifold, Holley 4160, TH350 trans (rebuilt w/shift kit), 3. Attach all vacuum lines, where necessary. The vacuum source for this purge signal will come. It is ported into the base of the throttle body so it sees the top of the intake manifold. 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 no great surprise since these carbs are mostly intended for race applications. Can I just cap off the Sniper vacuum port and leave in the manifold? Last edited by ngstahl; 05-09-2020, 08:49 AM. com/support/carbur In this video, we cover. Holley Sniper EFI System is Easy, Budget. As I wrap up this upgrade I’m not certain where the best location for the PCV hose. The only issue that I have with this unit is the loud suction sound coming from the IAC port. Attach all vacuum lines, where necessary. I chose not to use the aluminum fittings and purchased brass fittings to use instead. In a way, why did Holley even provide it, seems silly really, fitting carb replacement EFI and then still having vacuum advance. The Sniper only has 3 ports, A full manifold port (small nipple), brake booster port and one for vacuum advance on the distributor. Connect the PVC to the 3/8 nipple on the front of the EFI thats designated manifold vacuum/brake. There are vacuum ports on the Sniper TBI unit itself: http://documents. Sniper Official Site: Carb to EFI Conversions, Fuel. The PCV valve gets hooked to manifold vacuum, usually through a fitting on the base of a carburetor. Yes, you can use the PCV and power brake vacuum ports interchangably if you want. 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?. 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. Vacuum Port Side View Figure 3 6. Installing the fuel pump in the tank results in quieter operation, less chance of cavitation and a. 4150 Stealth, reversed front & rear vacuum ports, driveability …. Ported vacuum would only advance the timing when the throttle plates are open and below the threshold. Follow along as we make big power out of this 377ci small-block-chevy with bolt-on parts!. 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. 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). Purge line uses manifold vacuum. Question I installed my Sniper EFI, but how do I use my kick down for my C4 transmission? Answer. Purge signal uses ported vacuum usually routed thru a CTO, so theres no signal at idle or when the engine is cold. Holley Sniper Vacuum PortsView 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. 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. 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. 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. Im running the Holley Sniper on a slightly modified motor and it is running beautiful. 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. Note: Fuel pressure should be checked on the inlet fuel line before initial start up during the fuel pump prime. EFE + EGR Delete for Sniper EFI. This is why most OEM EFI pumps are in the tank. Top 10 Sniper EFI Installation Tips from Holleys Tom Kise. Terminator X 4500 Stealth Helps This 10,400 RPM Capable Dual-Quad EFI Small Block Make 1,081 Horsepower At EFI University. Holley Sniper EFI port ??. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. Doug Tags: None Danny Cabral Administrator Join Date: Dec 2009 Posts: 32834 Tweet #2. 44 Idle Air Control Motor Part# 543-105 $71. Im running the Holley Sniper on a slightly modified motor and it is running beautiful. It gets hot in there and condensation will make problems in your distributor otherwise. Determine where the port enters an area where it will be exposed to vacuum. To recap, I dont mind running it this way on this manual car, but its not my first choice for an automatic car.