Sniper EFI 2300 Marine. Why? (probably with the edelbrock marine 2506 intake). Runs like a champ now. Go to the web site and it will explain the installation it is very simple and works well.As for the rpm you are comparing to completely different animals (pumps). Get fast, Free Standard Shipping on orders over Summit Racing Equipment from $99 -- no shipping, handling, or rural fees! *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. I have not yet got it figured out. The spark must be manually tuned. Note the temperature sensor mounted on the back of the driver side head in the above photo. The Sniper EFI could very well be one of the easiest to set-up fuel injections systems ever. I have a 74 bronco, 302, mild cam. Even though you now have the USCG-approved Sniper EFI System as an option for your new EFI System you're not quite out of the woods yet. However, overcoming that whole idle/off-idle transition (mentioned above) is going to be the challenge. QFI-500 Oxygen Sensor. To my knowledge, there is no aftermarket EFI fuel system suited to fuel the Sniper EFI system that exists on the market. Yes, this is going to be an added expense, however, it will help guarantee your success. Now the lower cost Holley Sniper advertised for March 31 2016. Idle and off-idle performance (particularly as the engine goes into gear.) Thanks for that, Danny. It is possible for the ECU to have an internal failure that can kill O2 sensors. When I went to Holley HP, I found an adapter by Innovate that is designed to draw air out the exhaust stream and away to the O2 sensor. Greatest struggle is the shift interrupt. Ordered another dominator Bosch from Holley and it matches perfect. - You are currently viewing the forums as a GUEST. Apr 13, 2017. with the extension. Maybe this one has a shorter cable? Jun 7, 2021. Add to Cart . Sponsored Links (REGISTERED USERS DO NOT SEE THIS POST/AD! I had an o2 sensor fail on a pass yesterday, and flatline at 11.5afr. Douglas Cline. I am in the middle of a repower of twin BBC 481, mild cam which will need to be recarbureted. holley sniper efi Holley Sniper EFI Self-Tuning Master Kit - Black Ceramic Finish $1,475.95 Part# 550-511K holley efi 100 PSI Stainless Pressure Sensor $155.95 Part# 554-102 Are you waiting to convert your carbureted vehicle to Sniper EFI, but don't like the idea of mounting an external fuel pump? Oxygen Sensor, Replacement, Sniper EFI, Terminator X, 3-wire, Thread-in, Each See More Specifications | Check the Fit. I'm 3" down from the bottom of the flange to center of bung. I have not gone back in to try to fine tune them. Super helpful and knowledgeable. Is the O2 sensor on the dyno must have a very long pipe extending past where it is positioned or backwash from the room air will violate the readings as well as any header leaks. Looking for some advice pertaining to Holley Sniper and Tire Size upgrades. It looks like another season has come and passed by without the answer you wanted on this.I am impressed that you made the leap into marine fuel injection but you have experienced the same problem that everyone else who has tried this has faced. Put an end to cold start issues, hesitations, vapor . Most of you only need to tune 4 points, idling around the marina, part throttle - pulling the rope tight, 1/2-3/4 throttle - cruise, and YeeHaa - WOT. Taking a look at the holley manual I am thinking about drilling and tapping the front exhaust port on the log for the O2 sensor. In this video Holley's own Tom Kise explains oxygen sensors and where to place an 02 sensor bung in your exhaust. This doesn't mean it can't be done. The plan is to 'learn' a fuel\Timing curve with a closed loop. If you've done some automotive fuel map tuning before, you can likely overcome this challenge. OP, the Edelbrock system looks to use the same basic sensors as the Holley sniper system: TPS, MAP and O2, plus a few supporting sensors. Whether you're engine swapping your classic car or need to manage 4000 horsepower in your twin-turbocharged drag radial race car, Holley EFI has the solutions you need to get your project up and running better than ever! Replacement Sniper and Terminator X O2 Sensor, This part is legal for sale or use on Racing Use Only Vehicles. It should be pretty straight forward what each of these values do. Capability Range: Advanced It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt. Mark Twain, The goal in life: To die young as late as possible. The basic kit comes with the TBI unit, touchscreen controller, water temperature sensor, a wideband oxygen sensor, and all the necessary wiring. Don't know about HP increase, with the QFT 750 it would turn a 212/4.0 combo to about 3950 to 4000, the Sniper turns it to 4000 to 4100. 2 Reviews. Bolt on 4150 Flange Carburetor Replacement. Tune the delay relay timing to just miss the prime shot.For cold starts, a simple push-button or switch "choke" override to power the relay during prime would provide it. My bet based on longer pump run, to make pressure, you have a leaking injector. Maybe going all the way to the front is the way to go? A replacement clamp on would be an easy change out. . My boat is still in winter storage. the motor has the following mods, Aluminum heads, Performer intake, Sniper and MSD ignition module. non biased Shelby Cobra related site! Part Number: 510-554-155. For complete information about the cookies we use, data we collect and how we process them, please check our, actual instructions in flowcharting are represented in, Why Is Dave Blankenship Not On Oak Island Season 8, rhode island groundwater classification map. Holley EFI. Stock manifolds? Full time feedback from the sensor is what the computer uses to refine the fuel table. - Do you know of a Carburetor Builder who has addressed the Coast Guard certification issues with the Sniper EFI? You have to angle it to help the throttle cable get around the booster. Was in marine engineering for years. Systems that were already designed for marine efi. Yellow Init In First shown for an instant when the system is powered on. Plug into the coolant temperature sensor. EFI is the wave of the future. It works fine. Next, the new unit was installed onto the manifold. Sniper EFI 4bbl Marine. I thought the clamp on style mount was a good idea in case the threads got buggered up when a sensor change might occur, and the threads are rusted up by then. Part# 554-155. USCG approval is certainly worth careful consideration, as being on a boat that catches on fire is even more serious than being in a car that catches on fire. I upgraded from terminator x Maxx to dominator.. bought a 2nd o2 sensor kit with Bosch sensor and used an off the shelf Bosch I had been using with terminator. What Is Pinion Offset, And How Does That Affect You? All sensors are tested to ensure they accurately report critical engine data to the . I have tried several different settings to get it going, no luck. I would send an Email to Chris at EFIsystempro. It doesn't even mean that you can't do it. Holley's self learning system is a blessing and a curse. The O2 sensor burned out immediately. $108.95. I have a boat with twin 3.7 Mercruisers. For a better experience, please enable JavaScript in your browser before proceeding. Visit their website for more details. No one cares about your buddies old antiquated garden hose technology. The in tank pump is quieter, will normally run cooler and should last longer. Running? I installed the adapter and elbow so it's at an angle above the entry point. The O2 sensor burned out immediately. Holley EFI Oxygen Sensor. RPM going up and down , miss firing and backfiring. Thanks. That sounds like one solution. After a few tries by jumping the starter solenoid I then realized the ignition key was in the off position. My hand is holding the connector to the sensor. Introducing Sniper EFI Master Kits, with a Returnless Retrofit Fuel Module. Holley Oxygen Sensor O2 Bung Weld-In Style; Larger Image. He knows his stuff, gets back quickly to you, etc. Each engine has the Holley marine 2 barrel carburetor. Welcome to Club Cobra! While this is extremely unlikely if you are having immediate, back-to-back O2 sensor failures you should make the effort to rule this out. HP comes from torque and rpm and rpm breaks things and increases wear. Other than the constraints provided in the article above I see no reason why this wouldn't be a great upgrade. This page was generated at 08:35 AM. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. The basic kit comes with the TBI unit, touchscreen controller, water temperature sensor, a wideband oxygen sensor, and all the necessary wiring. While these base maps are generally quite good for cars they are going to be pretty far off in the case of marine applications. I am just now ready to do the tuning this weekend. https://www.efisystempro.com/efi-pro-hangout/sniper-installation-tips-holley-tom-kise, https://www.efisystempro.com/efi-prng-engine-startup-sniper-terminator-x-stealth. The bottom line is that trying to run EFI on a marine engine is not something you can do as an afterthought. It does not look like anything particularly superior in concept. Throttle body mounted ECU - no extra boxes to mount. Pay close attention to the instructions on O2 sensor placement. Who knows. My spare "Bosch O2 Sensor" came from eBay & was half the price of anywhere else I found. It will crank and run great for 2-15 seconds then die. Sniper EFI Installation Guide. The truck started fine after install, and ran down the road ok. After some time, the truck will not start after it comes to operating temperature. I installed a holley sniper kit. I hope that the next F/2F header is more O2 sensor friendly. You are using an out of date browser. O2 Sensor Mounting: The O2 needs to be mounted 6-8" after the merge in the header collector. (Image/Wayne Scraba) The throttle body is a bolt-on replacement for a carburetor. I am considering the Daytona Sensors Ignition module. Distributor and ignition box? For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. I will let you know what happens. Wideband Oxygen Sensor Extension Cable. B/c what it sometimes perceives as a lean spike is actually raw fuel with no oxygen. You really want a bigger engine. The fuel lines and fittings are 3/8s with 8AN fittings and everything on the 60 requires 5/16 fuel line with 6AN fittings) Holley Sniper EFI 550-849 Holley Sniper EFI 2300 Self-Tuning Kit - Shiny Finish. Oops, after that it cranked right up.Idle was set to 950rpm so after the vid was cut off I lowered it to 820rpm and it was purring like a kitten.EFI for dummies. I'll let you know how it works out. I just installed a Sniper on a 67 GTO and it was pretty straightforward, the end result was a much better starting/smother running car, than can adapt to elevation changes better, But we also installed the Holley Dual sync distributor for a complete system that adjusts timing as well. Restore | Make | Philosophize | Eat | Drink | Be Happy | Let's Go Brandon! Hooker BlackHeart Oxygen Sensor O2 Bung 2.25" Clamp-On Style, Hooker BlackHeart Oxygen Sensor O2 Bung 2.5" Clamp-On Style, Hooker BlackHeart Oxygen Sensor O2 Bung 3.0" Clamp-On Style, Holley Oxygen Sensor O2 Bung Weld-In Style. This runs in the area of $1000 and has everything you need for a basic install on almost any vehicle equipped with a four barrel carb. *Possible delays due to Covid-19 click for more information. Seems to LEARN much faster than the Fitech did. Be sure to disable autotune and remove the O2 sensor before it dies. All I can say is it made a completely different motor out of the 460, 39 degrees out and starts within 2 revolutions power is super smooth throughout the rpm range (idle to 4100rpms 212 Hamilton with 4.0 turbo impeller) has about 6 hrs of learn time. My Lightnings have a bung welded through the water and into the dry exhaust area at the collector. The other thing I want to overcome is the fuel return line; my harbor master says that I can connect my fuel return line to my CAV (lucas) gasoline filter, it has 4 connection, now only 2 are used. looking at doing the same. CUSTOM ART FOR CUSTOM NEEDS. Holley sent him a new one for free. There are drawbacks to that (as your tuner can explain in more detail) but it is doable, provided the system is correctly tuned initially. In the case of the car, you can generally get out and walk (run?) Free ground shipping regardless of order size! But you've found the right one for your Holley Sniper EFI System OR your Terminator X EFI System. Aftermarket headers are pretty much the only safe way to run an O2 sensor. The reason I say this is that nowhere in this discussion is the fact that none of these systems are are handling the timing on the fly. Hopefully this one lasts longer than the original. It just means that if you are thinking you'll install this, crank it, and pull away from the dock with complete success you might be in for some disappointment. Increasing efficiency is always a good idea. Capability Range: Advanced Newer ECMs have all the options to configure these functions. YES! I will get a new 02 sensor before I swap back to the orange box. Phil is right. The engine floods and it is embarrassing when leaving a lock. Conditions when closed loop o2 should be turned off. If he wants to run in closed loop and have the system adapting to conditions at all times, the minute he fouls he is dead in the water. Initially I was looking for the upgrade to a 4V holley 4175 carb, but this option has peaked my interest. We may earn a small commission from affiliate links and paid advertisements. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. #1. The Holley Sniper EFI Quadrajet is a self-contained throttle-body injection system that's a direct replacement for spreadbore Quadrajet carburetors found on many classic GM vehicles. Is this a good upgrade? Without Headers Steamers location (above) is perfect, up close to the engine where you . EFI Systems based on Holley's world-class Dominator and HP ECU's. Sniper EFI 2300 Marine. That would be for individuals that run the OEM exhaust manifold, as well as individuals that run headers. Had to replace the oxygen sensor on my car for the terminator x after the original one failed and this fixed all my problems. 3. Top 10 Holley Sniper EFI Tech Tips Holley Technical Training Manager Tom Kise's top ten "suggestions" for Holley Sniper EFI System installation issues. One example of a direction could be an adjustable timed delay-on injector-power relay in the injector power feed wire, delaying 1-second after key-on or whatever is necessary to bypass the prime shot time, only. This free oxygen is picked up by the O 2 sensor and determined to be indicative of a lean AFR condition when, in reality, the engine could potentially be running slightly rich. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Found out that it was due to rfi/emi. Spray a rag down pretty good with brake cleaner. John 1:5, 1969 FJ40 2F with Holley Sniper EFI, Power Disk Brakes Front & Rear, Downey, Your post has peaked my curiosity. I know from some of the other posts, there have been WBO2 sensor issues. Categories. Anti-Seize pre-applied to sensor threads. Bolt-on carburetor style EFI for your classic car or truck. This step is only for those installing their Super Sniper EFI on top of a draw-through or Roots-style blower. From time to time we receive phone calls from individuals who are interested in converting their carbureted boat motor to fuel injection. Without the engine running, AFR will read 35.6 The fuel pump will run off a relay in the sniper harness (blue wire) pink wire gets switch/run power to the relay. Depending on how fast you want one, there are plenty out there: The Cross ref numbers on the Holley forums and the Net is a Bosch 17025. Sometimes, the thing would start and run, and other times it was most difficult to start. Holley Sniper O2 sensor replacement. I've dunked mine lots of times. Replaced and gapped to .45 all spark plugs. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. The engine RPM when closed loop o2 will begin. On a side note: Im getting 4200 rpms at 5000 elevation with stock heads. This is made by Innovate, the guy that runs the Holley EFI forum HIGHLY recomends AND uses them himself, I use them, my o2 on my wideband Innovate, kept going bad, a 4.2 Bosch o2, put this on both my Holley HP NTK sensor & the wide band, been 2 years now & lots of driving, all good, Heat-Sink Bung Extender (HBX-1) - P/N: 37290 The right side o2 was obviously reporting a fat 10.3 afr as a result, but the car still went 139mph, LOL. Description. I mounted it here attempting to protect it from the deep water I play in and from lots of branches I encounter. Fortunately, it turns out there are some options. Supports up to 650hp with Four 100 Lb/Hr Injectors! Fuel economy went from 12.5 to 13.5 gph to 10 gph. I want to register an account for free right now! Emissions. But it is going to be a little tricky. Can more detail be provided? i'm not aware of a universal aftermarket EFI fuel pump kit that is USCG approved. EFI EFI kit electronic fuel injection. Holley recommends a 3/8" fuel supply line. Once you have those points set, the rest of the map doesn't really matter, just make it look smooth/pretty and everything will be fine. Option 1 is to purchase and install one of the Holley EFI Dual-Sync Distributors on your engine. A third option would be to run your EFI system without an O2 sensor at all. JavaScript is disabled. 3. This boat has a non-vortech motor with a 2 bbl gm intake i'll need to replace. http://forums.holley.com/showthread.ension-Harness, http://forums.holley.com/showthread.4388#post54388, If this is your first visit, be sure to One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle . O2 sensors are water proof. Bolt-on carburetor style EFI for your classic car or truck. Sorry for the late reply. As far as packaging goes, one comes in a Bosch box, the other in a Holley package. Aug 17, 2013. Not sure how well the sensor likes being that close to the port. The fuel pump question is the tough one. I am a competent mechanic and I have checked all the usual suspect items. They have mods that help. Make sure to put anti seize on the threads. And it is timing that is equally critical to best performance and fuel economy. Did a test startup on my new sniper by running the power wire to battery + and not using the o2 sensor.I also capped off the regulated return line with a hos. And who can blame them? Or maybe I could just use a piece of spare/junk exhaust tubing, and bolt it to the manifolds and add a weldless O2 bung to it. They are the only ones got me a holley usb to can cable fast. It will flood itself out and won't start back, just crank and crank. He is a wizard, might be able to give you some pointers, will ask you what version of the software you are on, whether you're running the progressive adjustable linkage, etc. I thought about adding some sort of extra protection but never did. There can be leftover debris from manufacturing that have been washed down and are now clogging one. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Since the Sniper install, I encountered my second O2 sensor failure so I thought I would try the "Innovate Bung Extender" recommended by a few folks here. Also the progressive link. These often don't work with stock ECUs, so your best bet is to weld in a second bung for the wideband sensor. Innovate Motorsports HBX-1 Bung Extender. I am a competent mechanic and I have checked all the usual suspect items. Install the throttle linkage to the Sniper EFI throttle body. Holley Sniper EFI Wideband Oxygen Sensor. Your talking flames at that point, and it will definitely have an effect on the reading. Everyone else was backordered several months. I'm using the NTK sensor. Note that this is a different sensor than Holley uses for their Dominator/HP/Terminator/Avenger series. It turns out that the loading generated a propeller in the water is significantly different than wheels on pavement, so much so that the map has to be tuned differently. the Hamilton 212 pump is maxed out at about 4600 rpms, however it will provide about 10x the thrust that the berkly it is not as fast but haul much more load and work way better in white water. functioning controller during engine operation. Assuming that your current ignition works well with the marine carburetors it will continue to work well with the Sniper EFI System. See Details. I do believe that the Holley EFI ECU's have the capability to be programmed to work in this application, but have not yet found anyone who has tackled this task and been fully successful.If you (or anyone else) does make some progress on this, please reply here and let us know what works. Oxygen Sensor is sold separately.Adaptor should be installed in a flat area of riser at least 6 before water blends with exhaust. For the most part each engine wants a bit of its own timing set-up IMHO, you boat owners with a 270HP 350 (or any other config) may want 350HP but upgrading it to that level will reduce or eliminate reliability. Holley EFI has the solutions you need to get your project up and running better than ever! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. I had an injector fail after a month of running and called the tech line who helped me figure that out. Let him re-jet the carb (a wee bit on the fat side for safety) and reset the timing and try again. Features: . As a follow up, I ended up using an eBay type anti fouler elbow for the O2 sensor to try and get it out of the water in the manifolds. If you find that please let us know. I have about 30 hrs on the unit and it just keeps getting smoother with every hr of run time. One comes in the form of a Marine O2 Sensor Adapter from the folks at Howell EFI. But this also makes me wonder what you did for the O2 sensor. : For registered members this ad will NOT show. For the most part, the small harness is plug-and-play. However, advanced tuning software is available for the Sniper EFI System that allow them to be tuned by a competent professional with experience tuning marine applications. This product works with Holley EFI wideband oxygen sensors, part numbers 554-100 and 554-101. It may not display this or other websites correctly. I wanted to let you all know, I have modified a mercruiser Cool Fuel Gen 3 module(mounted on the engine) to provide fuel to a sniper. Is Holley working on a complete marine package or planning to in the future? Menu. My tune is coincidentally set at 11.5 desired afr, with the failed side as the leanest bank, but the ecu added 15% fuel anyways. May 19, 2021. If you're not running one (or if you are and the water has killed it) then it is not surprising that you are running rich. Does an yone have a pic of the O2 sensor in their exhaust? I was mocking it up at the time. Then if that doesn't work call the tech line they are great! Good luck! The spark must be manually tuned. If I am reading your post correctly you are using two separate o2 sensors when using headers ? So I bought the progressive linkage but you then have . so mine has been pretty good but 1 out 20 starts you can hear the fuel pump run longer then normal..when it does that it will light off then diebut if i put my foot to the floor it will start..still working on that 1..timing i am running 12 cranking.20 idle.40 cruze.35 wotstill playing with all of this..Mine is also a sniper stealth. Having the same problem with my sniper as well, intermittent hot (and cold) start issues. According to AEM Electronics, a leading manufacturer of aftermarket Wideband O2 sensor kits, the following may damage or destroy oxygen sensors: Additionally, if an Sniper or Terminator X EFI System has repeated O2 sensor failures and none of the above-listed suggestions seem likely then contact Holley and arrange to have the unit tested. The sniper fit perfectly on the intake. It needs the tip pointed down at least 10 degrees from horizontal and at least 15 degrees from vertical I prefer about a 45 degree angle from horizontal. Will I be able to control my ignition timing with the Sniper? That is defacto step one in trouble shooting fuel injection systems. The Ford 2300 engine uses a Holley carburetor, but it is in fact a licensed copy of a 32/36 Weber. I want to remove the old fuel injected Mercruiser factory EFI on both engines because they have begun to be troublesome. Having selecting USCG-approved components, and sourced your O2 sensor adapter, there is but one more challenge--tuning. Stay up to date with the latest releases, events, promotions and more. I have also installed a sniper system on a 350 Mercruiser and was wondering if you have done any tuning on yours yet? My question is concerning what happens a year later, when I have a top-end swap . Holley Sniper EFI Oxygen Sensors 554-155 So please, If you have problems registering or can't log into your account, please. Stay up to date with the latest releases, events, promotions and more. Staff Writer. The oxygen sensor should be mounted at a point where it can read a good average of all the cylinders on one bank. The opposing pistons share a crankpin the way they do in a V-8, but the fact that there are only three cylinders on each bank means that the plugs fire at 90-150-90-150-90-150 intervals. All times are GMT-6. For a better experience, please enable JavaScript in your browser before proceeding. you don't want to read that loss. Mike. Register now for free!) Affiliate. You must log in or register to reply here. The first thing to consider here (if you are in the USA) is US Coast Guard (USCG) Safety Approval. I've got the Howell EFI adapter installed in the riser of some standard Inboard Manifolds and it works great. I have a 74 bronco, 302, mild cam. Sensors: Fitting: Threaded O2 . Some of the landlubbers who are reading this may not realize that many inboard engines utilize what is called a wet exhaust, pushing the water from the engine block into the exhaust and then back into the lake/river/sea on which they float. In a horizontal or if pointed upwards it can collect exhaust condensation liquids upon start up. I installed a holley sniper kit. That would be for individuals that run the OEM exhaust manifold, as well as individuals that run headers. . As I have since added above, the Sniper simply isn't going to be the system to use to tackle this problem. One of the benefits of using any Holley EFI system is that it self learns and tunes on its own. I don't have enough experience with marine applications to know exactly what it will take to solve this. Some logs have water up to just short of the port. This completes the basic installation of the Holley Sniper EFI 4150 Super Sniper 1250/650 kit. Seems to have more low end tq and is much smoother power through out the rpm range. I will keep the in-line pump for a spare. Sensors that are installed in an exhaust must be connected to a properly functioning controller during engine operation Additionally, if an Sniper or Terminator X EFI System has repeated O2 sensor failures and none of the above-listed suggestions seem likely then contact Holley and arrange to have the unit tested. YES! Its the Holley Pro Jection TBI mentioned by the above poster. I myself will convert my 2 302's (Volvo Penta 5.0 l AQ231A) from carbs to EFI; I must find out everything before I start work on the engines, then I am satisfied to start. AFR was 19 area. It could be an instant fix. . Advanced throttle body injection systems capable of transmission control and more. so simple check first, whats the fuel pressure? We can hear the initial fuel spray into the body, but it appears that its not enough to start the engine while hot. Holley Sniper EFI Self-Tuning Kit - Black Ceramic Finish. An adapter harness is available to connect this distributor directly to the Sniper EFI throttle body. Everyone raving about customer service is telling the truth! I will keep the replacements as spares. The included fuel system places a 340LPH fuel pump in the tank, which can easily be . The very basic fuel and spark tables are the limiting aspect, Holley does offer advanced software for more precise tuning. On my system, I machined in the O2 sensor right between the snail and the manifold of a . Anything else is going to be a frustrating recipe for for failure. PS, Once someone has a good 270/350 tune, everyone can use it. $102.95. What I don't want to do is spend more money on the headers than on the fuel injection upgrade and new propeller set. but I'm finding when running engines with holley sniper kits the the engines are very eratic ,the air fuel numbers are always changing drastically from one pull to .