EFI 8-Stack V8 Systems
Multiple styles of EFI
Why should you buy your EFI here?
We strive to create the most beautiful fuel injection systems in the world and it is our goal to be the very best at what we do. We want our customers to feel confident that we’re the right company to work with for such a major purchase.
We’re not a high-volume manufacturer; we’re a very small shop. Every detail is important to us, and every assembly starts with a clean sheet of paper to create an EFI unique to each customer’s needs and specifications. We don’t have finished assemblies on the shelf ready to ship. Your EFI will be built exclusively for you, exactly how you want it to look.
Please compare us to the rest
There are EFI’s offered today for under $3,000, and if you buy one of those, you’ll get what you paid for. They’re completely manufactured and assembled in China, so you’ll get a “Made in China” product, which should say everything you need to know about the quality. They can’t be compared to the ones made in the USA, so we don’t consider them to be our competition. Those EFI’s should be sold in flea markets. The bottom line is do your homework. You can get more information on any company by putting that company’s name into the search box at https://www.pissedconsumer.com/. You’ll find all kinds of feedback about the EFI’s made in China. See if you still want to buy one after reading about that company’s products and their “customer service”. You will see their score as “82% UNFAVORABLE, 13% FAVORABLE.
Pricing
We don’t have an actual price list because every order is customized. We can supply just the assembly or everything, including the computer, fuel pump, and an EFI-compatible ignition system. Generally, most of our EFI assemblies without a computer are in the $7200-$7400 range if it’s 100% complete and ready for startup. For a complete EFI conversion package including all the computer and other components, you will find yourself somewhere in the low $9,000 range.
Other EFI’s are available at lower prices, but we don’t compete with anybody else on price. Our pricing reflects the level of fit & finish that is our standard, and the personal service you will receive. Customer satisfaction is paramount to us, and we try to exceed expectations.
A Customer friendly experience
We understand that converting to an 8-stack EFI or Weber carburetion system can be a scary project for the first-time buyer who knows nothing about them. For that reason, every one of our units is shipped “ready to install” so you can just take it out of the box and bolt it on. We want you to focus on the startup procedure, not prep or assembly of the induction unit.
On our EFI’s, all the sensors are installed and labeled for you so you will know exactly how to plug everything in.
For the EFI engine control unit, we supply the Holley Terminator X, which we consider to be the most customer-friendly ECU available today. Even with customers scattered throughout the world, our phone doesn’t ring very much anymore with tech questions. That’s because we supply the most comprehensive instruction manual in the business. Our manual provides all the info you’ll need to answer the questions the “Tuning Wizard ” will ask you from the handheld screen. And Holley now has a plug-and-play Terminator X Bluetooth Module for wireless connection to your Terminator X or X MAX ECU, compatible with (Apple) iOS or Android-based smartphones for complete control of your Terminator X EFI System right from your phone.
Our manual covers everything you’ll need to set the EFI up yourself. That’s because whenever a customer called with a new question that wasn’t covered in the manual, we updated the manual to include that information. The manual includes comprehensive instructions, component identifications and specifications, replacement part numbers, lots of photos and helpful diagrams and charts, a comprehensive troubleshooting section, and actual screenshots of the Terminator X handheld screen. You won’t find a manual like ours anywhere else, and we include it with every Holley Terminator X ECU we sell.
We want our fuel injection package to be the most customer-friendly it can be, and we constantly strive to be the high-water mark of the industry.
We want every installation to be a success and most of all, to make sure you’ll have a good story to tell when someone asks, “Hey, where did you buy that?”.
If you require even more in-depth tuning or troubleshooting, call us to speak to our in-house tuner, or you can contact Andy Starr. We can set up your base calibration for you via a remote session or Andy can do it. Andy’s website is: https://starrperformancetuning.com/. Andy is our “backup” to ensure that EVERY CUSTOMER gets on the road, and we’re proud to have him as a member of our team.
If you need a “plug-and-play” EFI package, our own plug-in fuel maps are available for popular engines. Our 302/331/347/363 download delivers 475-525 hp, and our download for the 427W strokers delivers 560 to 580 hp. The horsepower you achieve will depend on factors such as your cam and cylinder heads, and our fuel maps can certainly be enhanced. All of our plug-in fuel maps were developed on real engines on the dyno, not by computer simulation.
Installation & Tuning
If you live in the southeast and need your EFI installed or tuned, our approved southeast service center is Smucker’s Garage in High Springs, Florida. Call Sean Tucker to arrange an installation date or tuning session on your EFI: (352) 214-1836. We offer tuning services here at our own location in North Florida. Just call to set up an appointment.
Complete component packages
Our complete EFI packages include everything you’ll need, starting with a Holley Terminator X computer and Holley 900 hp EFI fuel pump. We supply the ignition systems for EFI, so when you place your order, part of our discussion will cover the ignition system you currently have to determine if yours is suitable. Our goal is to make the process as simple as possible and to be a single point of contact for everything you’ll need. You won’t need to figure out or select any other components yourself; we’ll make sure you have everything.
As a Holley Direct Dealer, we buy direct from Holley and your components are shipped from Holley in Bowling Green, KY directly to your door. Your Holley components will arrive just a few days after you place your order with us.
Bluetooth Control from your phone
Holley now offers the cutting-edge option of Bluetooth EFI control from your phone. The ultimate tool for wireless tuning and real-time engine monitoring, this advanced module connects via Bluetooth, allowing you to adjust and optimize your engine directly from your iOS or Android smartphone. You can check it out on Holley’s website:
https://www.holley.com/products/fuel_systems/fuel_injection/terminator_x/parts/558-483
Choose from two styles of EFI
We offer two EFI types with distinctly different throttle body styles. If you prefer the look of a classic Weber carburetion system, our Weber-type EFI looks just like Weber carburetors. They’re so close in appearance and detail to actual Weber carburetors that it’s nearly impossible to tell the difference. We take pride in the attention to detail we put into our Weber-style EFI units. Special details include our own Weber I.D. plates and authentic 48IDA Weber OE carburetor components. Only the sharpest eye can detect the difference between one of our Weber EFI’s and Weber carburetion.
Ordering
The common question I’m asked is “How do I place an order?” Step 1 in the process is to call. We will work with you over the phone to complete a build sheet for your assembly. Once we have the build sheet completed, we’ll send you a detailed estimate for your approval. Further details for our ordering process are on the contact page of this website.
Here’s a side-by-side comparison showing our Weber carburetion system next to our “Weber” EFI. Can YOU tell which is which?
Our instruction manual provides all the information you need to complete the setup process on your own. Nowhere else in this industry will you find an instruction package even close to it. It contains valuable reference material, screenshots, replacement sensor part numbers and vehicle application listings, an in-depth troubleshooting section, and the specifications you need on all the components in your EFI.
Every step is well explained and documented with photos, diagrams, and screenshots of the Terminator X screen you’ll see during the setup process. This manual is written for a person with zero experience to set up the EFI by themselves.
For Sale Page
Although it’s rare, sometimes a customer may change their order and we might have an EFI available for immediate shipment. Anything like that can be found on our “FOR SALE” page. Be sure to check and see if there may be something listed there that might meet your requirements. Anything we list for sale is brand new and available for immediate shipment.
Conventional style EFI on a Smallblock Chevy manifold
If you prefer the modern look of a state-of-the-art EFI system, our throttle bodies are the most beautiful in the industry. The unique threaded-in air horns completely eliminate the use of any screws for an exceptionally sleek and clean outer appearance.
We offer EFI systems for all the popular GM early engines and LS series, Ford 302, 351W, 351C, 427/428 FE, the Ford SOHC Cammer, Ford Coyote engines. The Chevrolet EFI’s are available for smallblock, bigblock, and LS1, LS2, LS3, LS6, and LS7 engines.
Every EFI is custom-built to order. If it’s your first EFI system, I offer a 100% complete package with everything you’ll need, which includes the fully assembled EFI unit ready to install, the right ECU for your specific application, a fuel pump, and an EFI-compatible ignition system, if you need one. All our kits come with my own 30-page instruction manual to guide you right through the setup process.
The photo above shows a smallblock Chevy conventional-type EFI with a polished manifold and black throttle bodies, which are both popular options. We can paint your throttle bodies in any color you wish. Just supply us with the paint code.
All sensors are tagged
- Many of our customers have no idea what all the sensors are or what they do. For this reason, we identify everything for you with tags to ensure complete clarity and let you move through the installation without confusion.
Extra Detail
- A close look at our Weber-type throttle bodies shows our faux-Weber data plate attached to the side and our use of genuine Weber 48IDA jet cover screens on top.
Other EFI companies may leave it up to you to round up all the sensors you’ll need or they may supply them separately, requiring you to mount them. When your EFI assembly arrives from our shop, all sensors are mounted and labeled for you. We don’t want you to figure out how to mount or identify any sensors. Our one goal is to make every installation a simple process, whether you’re an EFI beginner or a seasoned installer.
It may surprise you to know that some EFI suppliers don’t supply ANY installation and setup instructions. Our focus is on your experience, so we want to make setting up your first tune as easy as we can for you. We also offer “plug ‘n’ play” fuel maps for certain engines that can be purchased and downloaded if you don’t want to set up the first tune yourself.
If you’re building a GT40 or a Cobra, we know authenticity is important to you. Our Weber-style throttle bodies now include our own “pseudo” factory I.D. plates for an even higher level of detail. These are exact copies of the I.D. plates that were on the earliest Weber downdrafts. If you blow-up the photo at the above right, you can see how authentic these I.D.tags look. Also notice that we install genuine factory Weber jet cover screens between the stacks. These are some of the details that set our Weber-type EFI assemblies apart.
We will include whatever engine control unit is best for your specific application. ECU technology is changing constantly and we do our best to keep changing with it. We supply and support Holley controllers because of their advanced technology and ease of use in comparison with all the others.
The right ECU is the key to any successful EFI installation. There are ECU’s made specifically for different engines. They may require very specific controls and the year of the engine sometimes makes a difference in which ECU to select.
In this industry, some ECU’s are self-learning; others aren’t. Some require a laptop and some don’t. We automatically assume you don’t know anything about EFI’s and that you’d probably like a self-tuning ECU with its own hand-held touch screen that leads you through the setup. That’s the Holley Terminator X.
If you have an electronically controlled transmission, we will select an ECU for you that includes transmission control, or, you may need a separate trans controller. Our packages also include the right EFI fuel pump for your application.
I get asked about ignitions and distributors all the time. If you need me to select an ignition for your engine, I’ll be happy to supply the matched components for a complete Dual Sync digital ignition package for your engine, including distributor, ignition box, coil, and wires.
Our goal here is to be the most customer-friendly and most comprehensive EFI supplier in this business, so if you need us to supply everything you need with one phone call, we’ll do that.
So now you know why we consider our EFI package to be the most user-friendly and complete EFI available anywhere. Please keep this in mind if you’re pricing others, and be sure to ask if “theirs” comes with every sensor properly mounted and labeled for you and whether they include an installation manual that covers every aspect of the installation and setup process. These are important added-value features, especially if you’ve never done this before.
Pricing
Our typical eight-stack fuel injection packages with all the “bells and whistles” will generally come in between $8500-$9000. Individual pricing varies on each unit and depends on the selected options. For exact pricing, call or email me with your details for an accurate price quote. If you email me, I will usually get back to you that same day.
Holley Parts Delivery
We are a Holley Direct Dealer, so Holley coms are always drop-shipped directly to you from Bowling Green, Kentucky. This cuts the transit time down and reduces the shipping charges to you. Holley’s shipping charge will be shown as a separate line item on your invoice.
Holley Support
Terminator X software is available under the support tab at Holley.com or you can click on this link: https://www.holley.com/support/resources/#Fuel_Injection. Scroll down to find the Terminator X platform and click on the second line: Terminator X Software. Download the software allowing the program to make any changes to the laptop as prompted.
I just wanted to thank you for your fantastic work ! I received it on Monday and I’m in heaven. It is superb!
I will send photos when it’s installed.
Thank you a thousand times,
François Clavien, Switzerland
Ford 8-Stack fuel injection
Our history started with Ford engines and we continue to specialize in them today.
Ford 427 Cammer EFI
This is the ULTIMATE cammer induction system, and it is an extremely limited production item. Just ten cammer manifolds were run for us in early 2024, and as of May 2nd, 2025, there are only 3 cammer manifolds left.
If you have a cammer or plan on building one in the future, or maybe you just want to put one of these on your shelf for bargaining power down the road, this is an opportunity to own a BRAND NEW 8-stack cammer fuel injection unit. We don’t know when…or if…we will ever see these manifolds again.
The cammer EFI comes with 58mm throttle bodies and 64 lb Bosche injectors, which allows this fuel injection system to support 960 hp. We know this because one of our customers achieved 966 hp at the flywheel with 865hp at the rear wheels with this EFI on his cammer.
Fuel-injected 1968 SOHC “Colliope” engine
In June 1968, HOT ROD Magazine featured this 8-stack-injected 800 hp version of Ford’s SOHC cammer on its cover. The “bundle of snakes” headers were for the Ford GT’s but the FIA banned American V8’s because they were seen as unbeatable, and the project was killed. The only known remaining fuel-injected Colliope engine now sits at the Henry Ford Museum. This fuel injection setup was most likely a Bosch system, but HOT ROD labeled it as a “modified Hilborn setup”. Either way, you can duplicate the capability of this engine with our EFI package.
Ford 302
Conventional 302 EFI with plain finish throttle bodies and short air horns.
The 351 Cleveland
Our 351C EFI is available in 2V, 3V, and 4V versions on the new much-improved Cleveland manifold that now includes a collective vacuum chamber for EFI. These EFI’s come with Weber-type throttle bodies, making them an ideal choice for Panteras. This one features our Sunlit Gold throttle bodies on a polished manifold with 3-1/2″ velocity stacks. Our reproduction Weber data plates are also clearly visible on the throttle bodies. Can you tell whether it’s fuel injection or carburetors?
Built for our “Frequent Fyer” customer Frank Micknak.
427 Ford FE / Weber
Our 427 Ford FE is shown here with Weber-style throttle bodies in standard finishes with one option….3-1/2 velocity stacks. All of our Weber-type EFI’s offer a variety of stack heights. This is a good example of enhancement for no extra cost. Just tell us what height stacks you want. Built for Frank Micknak.
Our FE units are also available with conventional …and huge…58mm throttle bodies if the highest hp is your goal.
Ford 351W
Our “base” 351W is pictured here, which includes our standard polished air horns and fuel rails…the EFI’s most visible components. This shows our conventional throttle bodies, and these units can also be ordered with Weber carb-type throttle bodies. This unit has our 35mm “shorty” air horns, which are a no-cost option if you need additional hood clearance. These throttle bodies can also be ordered with 2″, 3″, and 4″ air horns.
Ford Coyote
Our Ford Coyote EFI’s come with 55mm throttle bodies and can also be built with the Weber -type if a more vintage look is preferred. If it needs to fit under a 427 Cobra hood scoop, we also offer Coyote EFI’s on a manifold that tilts the stacks inboard 10 degrees.
427 Ford FE with 58mm throttle bodies
The Ford 427FE conventional EFI is shown here. These come with huge 58mm throttle bodies and it’s one of our lowest-profile assemblies. Look closely and you’ll see this manifold also has nitrous oxide. If you want your EFI with NOS, let us know. This unit can produce over 800 horsepower on a stroked FE.
NOS Lines
Here’s a better look at the NOS lines. On an EFI, only one set of injectors is needed to deliver the nitrous. When the NOS button is pushed, the EFI’s computer delivers the extra fuel through the fuel injection unit. With just 8 lines, there is much less clutter.
Custom-made billet manifolds for ANY engine
With the help of our friends at Hogan’s Racing Manifolds, we can now build an 8-stack induction for virtually ANY engine on a custom billet aluminum manifold. This photo shows the natural beauty of these custom manifolds made from a solid block of aluminum. They’re created using a state-of-the-art process known as 5-axis CNC machining, and each manifold is a visual work of art.
These billet manifolds can be ordered as an upgrade to any one of our standard cast manifolds as well. Check out this fascinating video to see how these manifolds are created: https://www.youtube.com/watch?v=WzEk7AsAQR0
Call us with your requirements.
Every billet manifold has this machined finish and is an absolute work of art. We can build any of our EFI’s on a billet manifold. A CNC-machined billet manifold like this takes the induction unit over the top. Just tell us what engine you need one for.
A fully polished Ford Coyote EFI system built for Roderick Baker’s ’56 Ford pickup in Illinois, built by Riddler Award car builder Tim O’Connell. This one has taller air horns than the standard 50mm.
Chevrolet EFI Systems
Our Chevrolet EFI offerings range from the standard smallblock and bigblock Chevy engines to the LS series, with manifolds for LS-1, LS-2, LS-3, and LS-6.
Our long-awaited new generation Bigblock Chevrolet EFI is shown here in standard finishes with conventional 50mm throttle bodies and 3″ airhorns. The new-generation BBC manifolds have all the latest features incorporated, including extra vacuum takeoffs for accessories and an integral, direct-mount IAC motor (rather than a large remote-style IAC) for a much cleaner look. These manifolds are available in a rectangular or oval port configuration.
LS-3 with standard throttle bodies. We build EFI’s for LS-1, LS-2, LS-3, LS-6, and LS-7 engines.
Shown here is a fully polished smallblock Chevy EFI with 4-inch tall air horns. We offer air horns in four sizes ranging from 1-3/8″ to 4″. Tags on the IAC and coolant sensor can also be seen in this photo. We install and tag all sensors for you here to avoid any confusion.
The LS-3/LS7 “Semi Crossram” is one of our most exotic EFI”s. This is the top of the food chain if you want to make a statement with a different look in EFI. The manifold is shown here in an optional finish to match the customer’s car, with polished air horns and fuel rails, standard on all our assemblies. The LS3 semi-xram EFI’s all come with bright-machined billet throttle bodies and valley cover as shown.
Screens and filters
Debris screens provide protection without effecting the visual beauty of the eight stack unit.
Our individual stack filters are custom-made for every type of EFI velocity stack by BBR, a leading manufacturer of individual stack filters. Our stack filters can be ordered as the flat type shown below or the round-top “Nelson” style shown here. We also offer an oval filter…one for each Weber throttle body (see them at the bottom of the 8-stack carburetion page).
BBR filters are custom-made to fit every type of air horn and they add very little to the height.
What our customers say
“Jim,
What a wonderful piece of art you have sent, Thank you. The mechanic, machine shop and all friends are completely impressed. (as well as myself being very impressed)
Tim McMath”
“Jim,
Just wanted you and your team to know the fuel Injection system you put together for us is more beautiful than I ever expected.
I am sure the performance will equal the attention to detail spent on this project.
Thanks
Bob Lima“
“Jim,
We completed the install of the 8 stack system and it is running great! We put a basic tune in the Holley Dominator ECU and got it running. We were going to fine-tune it on the dyno but so far it is learning and improving with every drive. It gives me the instant start, good idle speed, and plenty of punch from a stop. I will let you know how it improves as it gets more data.
Bruce Conwell“