The sniper sets timing based on a MAP and RPM table. 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. 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. Lock the distributor, reconnect vac advance to a manifold port or one that pulls vacuum full time even at idle. The port on the distributor cap would benefit if you connected it to weak vacuum on the air filter assembly. The companys filing status is listed as Active and its File Number is. The larger tube at the base of the carburetor provides full manifold vacuum at idle. The Holley Sniper intake has 4 vacuum ports on the bottom and Holley gives you aluminum fittings to use. The fitting is where the brake booster is currently running into the intake. 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. No other vacuum lines needed except your brake booster. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. Holley Performance Products has written this manual for the installation of the Sniper EFI TBI fuel injection system. 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. Holley Performance Products Forums>Rev Limiter. The Sniper EFI System comes with a built in fuel pressure regulator, factory set at 58. Purge signal uses ported vacuum usually routed thru a CTO, so theres no signal at idle or when the engine is cold. Holley Sniper Intake and Valve Covers Installed. The Sniper Stealth 4500 also features multiple Input and Output options for sensor inputs and switched outputs to control external relays. 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. 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. The sniper should have a fitting on the rear that the instructions label as brake booster. Sniper ported vacuum issue. 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. 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 vacuum ports pickup manifold vacuum from a slot in the casting which has a passage to the throttle bores. At the front of your carb has 2 vacuum ports in the lower baseplate. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. You can lock out mechanical advance with a simple bar across the advance weight posts instead of springs or like this with screws. 72 O-Ring And Mounting Hardware Kit - LS3/L92 Part# 870003 $26. Yes, you can use the PCV and power brake vacuum ports interchangably if you want. 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. Vacuum Port Side View Figure 3 6. 44 Idle Air Control Motor Part# 543-105 $71. Attach all vacuum lines, where necessary. You also have 2 vacuum port holes at the back of the intake. Holley 137K subscribers Subscribe 911K views 13 years ago Carburetor Installation & Tuning Segments Learn More: https://www. Here Is The Correct Procedure For Setting An. The front ported vacuum port pulls 20 of vacuum, the rear manifold port pulls 7-10 of unsteady vacuum. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS PART 1. In business for over 100 years, it would be an understatement to say that they know what they are doing. com or do what I did, and go to http://www. Holley Sniper EFI 2300 2BBL HyperSpark Distributor, ECU, and Coil Offenhauser 5585 90° adapter (to line up throttle controls on driver side) (~12Hg). You can set a fixed timing setting to verify that you are actually getting the spark when it is calling for it. Avoid using any 90 degree fittings between the tank and pump. This is no great surprise since these carbs are mostly intended for race applications. Need a vacuum source for the PCV and power brakes. Ill use the manifold 3/8 for brake booster, the manifold 3/16 for ignition advance and leave the 3/16 ported capped. Two 3/16 and one 3/8 for vacuum manifold, booster & distributor respectively. The Holley Sniper intake has 4 vacuum ports on the bottom and Holley gives you aluminum fittings to use. Specs- 350 engine, Edelbrock Performer EPS manifold, Holley 4160, TH350 trans (rebuilt w/shift kit), 3. Attach all vacuum lines, where necessary. 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. Total (initial and centrifugal) as well as load based (vacuum) are built into the table. Now see if that area is blocked by a gasket or part of the intake. Installing the fuel pump in the tank results in quieter operation, less chance of cavitation and a. Usually the ported nipple, but the manifold port is ok as well. Not all model 4150’s have vacuum connections, however, some model 4150s are equipped with three vacuum tubes. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. Not the 1/16” port which is used when running a draw through application, the larger port to the driver’s side. 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. Three vacuum ports are available on the throttle body. To recap, I dont mind running it this way on this manual car, but its not my first choice for an automatic car. The smaller tube attached to the metering block is timed spark (vacuum provided any time after off idle). holley vacuum port for distributor. Its part#1044 and you can purchase it directly from their website www. Has anyone had to install stubs or plugs? Im new to the forum and not sure how to add a pic to this thread. Holley Sniper EFI 822242 Sniper EFI Fabricated Intake. Holleys Super Sniper Stealth can support 1,250 horsepower and 21. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. Holley Sniper EFI with HyperSpark, Comp Cams, NOS cheater plate with powershot solenoids. Holley Sniper 4150 Stealth & Returnless. May Gods grace bless you in the Lord Jesus Christ. We recommend at least a 3/8” feed line and 3/8” return line. Intake Manifolds, Fuel Injected. 00 Purchase Here: holley. I find the most helpful datalog function, is overlaying the datalog on your GCF. Holley>COMPETITION CARBURETORS MODEL 4150 HP SERIES. 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?. Introducing Holley EFI V6 Software Updates. Quick Question, I noticed the regular Sniper 4150 Sniper is sold with the Returnless Pump by Holley (e. Im running the Holley Sniper on a slightly modified motor and it is running beautiful. 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. Use one for your power booster and use the other for a multiple vacuum port. It is ported into the base of the throttle body so it sees the top of the intake manifold. Disruptions due to flooding are ongoing across northern Maracay, Aragua State, as of Oct. They looked at it and said the vacuum line should be connected to a vacuum port directly on the manifold, ie. An easy test would be to set your rev limit to 1500 RPM and test it. If youre not using power brakes (or if you have the booster plumbed to the intake manifold), use that one for your PCV hookup. Use this for PCV, power brake etc. It is located in the north-central region of Venezuela. Holley Performance Products Forums>Erratic AFR?. Heavy rainfall caused the Corozal and El Castano rivers near Henri. Remove the plug and attach the vacuum gauge here. Low Vacuum on Holley Sniper EFi. Holley Sniper EFI Installation Tips and Tricks. The threaded vacuum port is a 3/8 size, and is made by Performance Stainless Steel. I had the manifold changed since they did the tranny work, so I cant blame them if its connected wrong. HOLLEY SNIPER EFI TUNING tips, info sharing, ideas>HOLLEY SNIPER EFI TUNING tips, info sharing, ideas. You will need to connect the Evap can and brake booster vacuum ports here. 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. Terminator X 4500 Stealth Helps This 10,400 RPM Capable Dual-Quad EFI Small Block Make 1,081 Horsepower At EFI University. the same one that the brake power booster is connected to. Holley Sniper Vacuum PortsCan I just cap off the Sniper vacuum port and leave in the manifold? Last edited by ngstahl; 05-09-2020, 08:49 AM. If open and no vacuum then a gasket or something is blocking it. 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 chose not to use the aluminum fittings and purchased brass fittings to use instead. The Correct Procedure For Setting An. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. (something like this https://www. Vacuum port for AT almost always comes off an intake port/nipple. Tags: None AndyF Senior Member Join Date: Mar 2017 Posts: 3883 Share Tweet #2 11-26-2020, 12:18 PM. insights into running manifold vs ported vacuum to settle and disputes. There is a good description in the instruction for those ports. They looked at it and said the vacuum line should be connected to a vacuum port directly on the manifold, ie. Not all model 4150’s have vacuum connections, however, some model 4150s are equipped with three vacuum tubes. Most street Holley carburetors position the manifold vacuum port in this location (arrow) on the carburetor mounting base. Lock the distributor, reconnect vac advance to a manifold port or one that pulls vacuum full time even at idle. 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. 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. For best results, Holley strongly recommends an in-tank pump. No timing control, no (spark based) Rev Limiter. 5psi of boost so we teamed up with ProCharger superchargers to put one to the test on Westech Performances engine dyno. The Sniper has an internal MAP sensor. And 10 micron filter between the pump and throttle body. The numeric IAC value was out of whack (anywhere from 0 to 30%). com/parts/PRS-1044/ See more 6 Reply Save Like 1 - 15 of 15 Posts BillyGman Discussion Starter · #2 · Nov 21, 2010. Sniper Official Site: Carb to EFI Conversions, Fuel Systems. 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. 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. Where to Hook Up Vacuum Lines On A Holley Carburetor. (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. 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. Specs Service Parts Throttle Position Sensor Part# 870001 $38. Product includes all gaskets and hardware for a hassle-free installation The Sniper intake will only accept EV1 style injectors. I have the Holley HyperSpark system, so theres no vacuum advance on that I don’t think. Sniper EFI Bolt-on carburetor style EFI for your classic car or truck. FJ60 Holley Sniper Conversion. 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. 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. Determine where the port enters an area where it will be exposed to vacuum. I looked on Jegs for your intake ( http://www. Vent line from carburetor bowl. 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. Vacuum Port Side View. There are vacuum ports on the Sniper TBI unit itself: http://documents. 1) Sniper EFI Fabricated LS3 Intake Manifold RPM Power Band: 3,500 – 8,000rpm Intake Runner Length: 5. Connect the PVC to the 3/8 nipple on the front of the EFI thats designated manifold vacuum/brake. 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. Connect the brake booster to the runner on the intake. AUTOIMPORT PARTS, LLC is a Florida Domestic Limited-Liability Company filed on March 19, 2019. Specs- 350 engine, Edelbrock Performer EPS manifold, Holley 4160, TH350 trans (rebuilt w/shift kit), 3. The Sniper only has 3 ports, A full manifold port (small nipple), brake booster port and one for vacuum advance on the distributor. The threaded vacuum port is a 3/8 size, and is made by Performance Stainless Steel. So the rear vacuum advance port is the only one. 623 lift/114° LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1. 92 Ford Mustang GT: 385/6. Sniper Official Site: Carb to EFI Conversions, Fuel. Apr 15, 2009 #5 O ORANGE77 Veteran Member Jan 17, 2002 779. The sniper sets timing based on a MAP and RPM table. If the trigger is not phased correctly you will be off on everything. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. New install, AMC 360, runs bad, datalogs. 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:. Vacuum Port Side View. Purge signal uses ported vacuum usually routed thru a CTO, so theres no signal at idle or when the engine is cold. The nipple needs to be 3/8 for proper brake function. Vacuum port for AT almost always comes off an intake port/nipple. Be sure to plug any vacuum sources not used on both the Sniper EFI Throttle Body and on the Engine. The vacuum source for this purge signal will come. Holley Sniper EFI Intake Manifold 835011 Vacuum Port Quantity, None. This is why most OEM EFI pumps are in the tank. As I wrap up this upgrade I’m not certain where the best location for the PCV hose. If ping is heard, back the timing down 2 degrees at a time until pinging stops. Please read all the WARNINGS and NOTES, as they contain valuable information that can save you time and money. 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. The first one is a 3/16-inch ported manifold vacuum at the front, perfect for a vacuum advanced distributor connection. 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. Yes, the sniper has a timed spark vacuum port that will operate the vacuum . 4150 Stealth, reversed front & rear vacuum ports, driveability …. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS. 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. Ships Today. Im getting ready to put a Sniper on a customers 67 Mustang, stock 289/C4. Question I installed my Sniper EFI, but how do I use my kick down for my C4 transmission? Answer. I stopped at the transmission place that rebuilt my transmission about a year ago. Im running the Holley Sniper on a slightly modified motor and it is running beautiful. Sniper EFI Installation Tips from Holleys Tom Kise>Top 10 Sniper EFI Installation Tips from Holleys Tom Kise. The Sniper line of fuel pumps, regulators, and filters make Sniper a one-stop shop for a complete fuel system overhaul. The PCV valve gets hooked to manifold vacuum, usually through a fitting on the base of a carburetor. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. One post on a Holley forum recommended the IAC value to be 10-20% for a manual transmission. Can I use this for a PCV connection? If not, what is its purpose? Thanks!. These ports will provide ample vacuum port sources for both carbureted and EFI. Holley>QUICKSTART MANUAL. Note: Fuel pressure should be checked on the inlet fuel line before initial start up during the fuel pump prime. With the idle mixture screw removed, the tapered portion is what adjusts the volume of fuel allowed into the engine. 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. 623 lift/114° LSA camshaft, TFS R-Series. Vacuum Port Side View Figure. An easy test would be to set your rev limit to 1500 RPM and test it. what do you mean ported vs manifold? for the vacuum source of the dizzy? I did learn something over at the holley sniper forum -. 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?. 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 Sniper EFI System comes with a built in fuel pressure regulator, factory set at 58. 1 on the left and one on the right but one is higher than the other. Vents vapors from the fuel tank into the canister. 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. Both are full vacuum and it doesnt make any difference if its near the primaries or secondary side. com/parts/clp-in38rs/overview/) Then use the large port on the carburetor for your PCV, which is probably a 3/8 hose. 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. Sniper EFI Tuning & Tech. 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/support/carbur In this video, we cover. 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. 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. This is why most OEM EFI pumps are in the tank. See Figure 4 for diagram of vacuum ports. 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:. AUTOIMPORT PARTS, LLC in Apopka, FL. 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. Connect fuel feed and return hose. If the port is truly open to the vacuum, then it will have vacuum. 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. You also should vent you PCV and charcoal canister to vac. 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. Sniper EFI Bolt-on carburetor style EFI for your classic car or truck. 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 . Reconnect vac advance, the timing should be around 20 - 24 degrees before top dead center. com Holley is unquestionably a leading name in the world of LS performance parts. 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. 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). Yes, the sniper has a timed spark vacuum port that will operate the vacuum advance. Most street Holley carburetors position the manifold vacuum port in this location (arrow) on the carburetor mounting base. Purge line uses manifold vacuum. Doug Tags: None Danny Cabral Administrator Join Date: Dec 2009 Posts: 32834 Tweet #2. 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/. the same one that the brake power booster. Chevy LS3 Intake Manifold Upgrade Guide. It is situated in the central highlands, 1,500 feet (460 metres) above sea level and 70 miles (110 km). See Figure 3 for diagram of vacuum ports. On my Sniper EFI, there are three vacuum ports in the back. You want the highest port for your distributor. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. 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. May Gods grace bless you in the. com>Holley Carb Vacuum ports. Sniper Fabricated Intake Manifold Kits (Carbureted & EFI versions. It gets hot in there and condensation will make problems in your distributor otherwise. 550-516D), but not the 4150 Stealth version. #1 Vacuum Ports 12-30-2019, 09:20 AM There are three ports on the back of the Sniper. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. XFlow does not have a ported vacuum port that would typically be used with a vacuum advance distributor. pdf (Holley Sniper EFI Instruction Manual - See Page 7). One post on a Holley forum recommended the IAC value to be 10-20% for a manual transmission. Vacuum Ports, 1/8 and (1) 1/4 Pipe . where should TH350 actuator vacuum line connect?>where should TH350 actuator vacuum line connect?. Question Is the Sniper approved for use in marine applications? Answer Yes, Holley does have Sniper EFI Marine certified applications. Not sure what to do with the three vacuum ports on the back of the Holley Sniper EFI for my configuration. Ill use the manifold 3/8 for brake booster, the manifold 3/16 for ignition. Aragua State (Spanish: Estado Aragua, IPA: [esˈtaðo aˈɾaɣwa]) is one of the 23 states of Venezuela. 5) ThunderHead289 269K subscribers 121K views 7 years ago Carburetor School - Become a Carb Expert: Understanding Settings &. 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. 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. Finding a tough to find vacuum leak?. At the front of your carb has 2 vacuum ports in the lower baseplate. So there’s no way that a carburetor spacer will block the vacuum ports. 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. 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. They said insufficient vacuum would be causing the late shifts I described. 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). 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 Carb: Ported vs Manifold Vacuum Advance. The Holley Sniper EFI has a built in fuel pressure regulator pre set to 58psi so it should (fingers crossed) be a breeze. In a way, why did Holley even provide it, seems silly really, fitting carb replacement EFI and then still having vacuum advance. Follow along as we make big power out of this 377ci small-block-chevy with bolt-on parts!. #1 Vacuum Ports 12-30-2019, 09:20 AM There are three ports on the back of the Sniper. Ported vacuum would only advance the timing when the throttle plates are open and below the threshold. Adding a PCV vacuum port to Holley carbs. Ditch the Carb and Go EFI with Holley Terminator X Stealth 4500 and 4150. 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). 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 only issue that I have with this unit is the loud suction sound coming from the IAC port. Holley offers a variety of fuel pumps, hoses and accessories to complete your installation. 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. (54) In Stock, Including at a Supplier. Question: There is a threaded plug on the front of the throttle body. Danny Cabral Administrator Join Date: Dec 2009 Posts: 32967 #3 Yesterday, 08:47 AM ABC is correct. 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. HOLLEY SNIPER EFI TUNING tips, info sharing, ideas. 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. Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS PART 1. 700R-4 ProBuilt, Moser 12 bolt with 3. Connect your distributor to one of the 3/16 vacuum ports on the EFI. Edelbrock 2176 vacuum source. The FRONT port (plugged) peeks out UNDER the throttle blades (manifold). 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. Usually Td into the PCV purge line.