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