350 chevy efi

EFI systems for power and control. Motoring enthusiasts spend a lot of time on their vehicles. Often the focus is on the mechanical side of things, and we can spend many hours under the hood tinkering with all aspects of our performance vehicles. Aesthetics – inside and out – is always important. Your vehicle's technological aspect is just ...

The TPI manifold was originally designed for 305ci engines with 19 lb/hr fuel injectors operating at 36 psi, and employs a long and narrow runner to enhance bottom and midrange torque. The 350ci ...If you’re in the market for a new or used Chevrolet vehicle, it’s important to find a reputable dealership near you. With so many options available, it can be overwhelming to choos...EFI - Fuel Injection. Carburetors. Carburetor Components. Fuel Pumps Regulators and Filters. Also in Air & Fuel Delivery. Air Cleaners. Air Scoops. Cold Air Intake. Fuel System Kits.Find CHEVROLET 5.7L/350 Chevy small block Gen I Holley Sniper and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase ... Distributors, Sniper EFI, HyperSpark, HEI Cap, Hall Effect, Ignition Module, Shiny Billet Housing, Chevy, Gen I, 262-400ci, Mark IV-V, 396-454ci, Each. Part Number: SNE-565 …Here are 10 great Sniper EFI System installation tips from Holley's Tom Kise. Holley Technical Training Manager Tom Kise recently published a list of ten . Click here to learn more about this liquidation sale. Don't miss out! ... Chevy 350, rocker cam, mild cam. Chris Myer: 02/25/23, 03:41:27 PM.

Jackpot LS EFI System - Master Kit with Tank Conversion Pump Module with Internal Regulator + 20' PTFE Hose Kit Sale price From $2,236.75 Regular price $3,171.16 On Sale! Jackpot LS EFI System - Master Kit with Tank Conversion Pump Module with Internal Regulator Sale price From $1,937.98 Regular price $2,766.95A stock 350 motor can have as little as 145 horsepower and up to 370 horsepower in the LT1 model that was stock in the late 1960 Corvette. The Chevy stock 350 motor had a huge decr...Jan 1, 2024 · The classic 350. Our 350 HO is assembled with all-new parts and high-flow heads, giving you more power than just about any production-spec Small-Block ever installed at the factory. PART NO. 19355662. 333 HP @ 5100 RPM. 381 LB-FT @3700 RPM. The Holley Sniper EFI Self-Tuning Master Kit is a highly recommended Chevy 350 fuel injection kit. Since no post-install tuning is required, it's great for beginners. Both two-barrel and four-barrel kits are available for engine that crank up to 800 horsepower. An alternative to EFI is throttle body injection.A fuel injection conversion is essentially taking an engine that is carbureted and swapping the carburetor for a an electronic fuel injection (EFI) system. Both a carburetor and a fuel injection system function to add the perfect air to fuel mixture to your vehicles engine. Fuel injection systems were introduced in the 1950s, and had replaced ...This is the original 1979 350ci small-block. Not the picture of efficiency when new. When the truck was getting fed through the Quadrajet, my highway mileage was 10.5 to 11.0 miles per gallon. After installing the …The Sniper EFI throttle body is available in three finishes: shiny, black ceramic, and classic gold. Choose Your Ratio. One of the great features of the Sniper is the ability to set your air/fuel ratio (AFR) where you want it. A Stoichiometric air-fuel ratio is 14.7, which is the ideal ratio for “exhausting” the lowest emissions.

Base Smallblock Ford. Shown as shipped, with chromed velocity stacks, complete braided fuel lines, and pressure regulator, which can be mounted on the unit (as shown) or it can be mounted by you where you like it. …I wanted to follow suite with the popular FiTech tuning tips thread but being more specific with Holley information. ENGINE SIZE: 350. HOLLEY SETUP USED: 600 HP Sniper in shinny finish. ENGINE VACUUM: Thinking it's around 13.Holley 550-511K Sniper EFI Self-Tuning Master Kit with Black Finish Features: Dual Pattern bolt-on carburetor replacement, made to fit 4150 Flange & Spread Bore manifolds. Self-tuning ECU for easy EFI without requiring advanced computer/tuning skills. Simple Calibration Wizard - Answer a few questions about your engine, and it creates the base ...ATK Engines HP32CPAK1 - Chevy 350 Engine and Transmission Kit. (0) $9,241.34. ATK Engines HP32C - HP32C High Performance Crate Engine Small Block Chevy 350ci / 350HP / 400TQ. (0) $4,574.99. ATK Engines HP32M - High Performance Crate Engine Small Block Chevy 350ci / 350HP / 400TQ. (1) $3,648.99.Find CHEVROLET 5.7L/350 Crate Engines Fuel Injection Intake Manifold Style and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App Vehicle/Engine Search Vehicle/Engine Search Make/Model Search38350. Ultimate SBC TPI Standalone EFI System. $ 847.00. or 4 interest-free payments of $211.75 with. ⓘ. Product Number: 38350. Add to cart. California Prop 65 Warning. This product falls under the following Emissions Category:

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Choose Speedway Motors for the highest quality Small Block Chevy 350 Fuel Injection Kits online. Speedway Motors is always focused on quality, which is why we don’t sell cheap Small Block Chevy 350 EFI kits, we sell Small Block Chevy 350 fuel injection systems that fit your budget, without sacrificing on quality.Bolt-On Blow-Through EFI System easily makes over 900 HP On A Small-Block Chevy! When Steve Brule isn't busy co-hosting Engine Masters or dyno testing/tuning customer's engines, he's working with ...Find CHEVROLET 5.7L/350 Chevy small block Gen I FiTech Fuel Injection and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App Vehicle/Engine Search Vehicle/Engine Search Make/Model SearchThe TPI manifold was originally designed for 305ci engines with 19 lb/hr fuel injectors operating at 36 psi, and employs a long and narrow runner to enhance bottom and midrange torque. The 350ci ...3 days ago · FiTech Retro LS EFI 650 HP Fuel Injection Systems 37001. Fuel Injection System, Retro LS EFI 650 HP Self- Learning, Throttle Body, Injectors, ECM, with Transmission Controller, Kit. Part Number: FIF-37001. ( 1 ) Estimated Ship Date: Monday 5/13/2024. Free Shipping.

Chevrolet Performance ZZ6 EFI Turn-Key 350 ci Engine. ZZ6 EFI Turn-Key 350 ci Engine. 420 HP @ 5,800 rpm. 408 ft.-lbs. Torque @ 4,500 rpm. View Details. $13,488.00. Ships …Oct 22, 2020 · Are they asking what year the injection is? Early TPI used a MAF sensor, later TPI used a MAP sensor, which might require different wiring harnesses. -Dave. '70 Chevelle ZZ383 / 700r4 / 3.73 -- MS3X efi / Hotchkis A-arms & Springs / B-body 12" brakes / 1.25" F-body swaybar / UMI rears & swaybar / JGC PwrStrUpg. R. While Bosch was working with Mercedes, Chevrolet was hard at work on a fuel injection system of their own. Developed and engineered through GM’s Rochester Products division, the Rochester Ramjet mechanical fuel injection system for Chevrolet’s 283 V8 engine in 1956, marketed for the 1957 model year.Instructions. -. Chevy SBC 350 Downdraft EFI Stack Intake Manifold System Complete Black. Speedmaster®. Chevy SBC 350 Downdraft EFI Stack Intake Manifold System Complete Black. No Reviews yet. MPN: 1-148-004 UPC: 840136500599 Extended Warranty Eligible. US $2,450.00.Upgrade the classic GM TPI systems to modern EFI technology; Improves driveability and performance with advanced self-learning technology; Boost ready with a 3 BAR MAP sensor to support up to 25 psi; New wiring …There is simply no beating the look of stack injection! Hilborn’s new EFI-R intake capitalizes on the aesthetics and racing heritage of Hilborn’s original intake manifolds and adds the capability of modern electronic fuel injection and machining. These intakes improve throttle response, low-end torque, and high-speed power, and fit 9.800in and 10.200in deck height big-block Chevy engines ...Small Block Chevy 350 with Comp roller cam and Holley Siper #holley #compcams #sbc #edelbrock #chevroletThe torque specifications for Chevrolet 350 cubic inch V8 head bolts are 65 foot-pounds per bolt if securing the stock cast iron head. Aftermarket aluminium heads have unique torqu...Fuel Injection System Complete TBI-For Stock 350 Chevy EFI for off road use. Performance Fuel Injection Systems (2058) 98.6% positive; Seller's other items Seller's other items; Contact seller; US $1,049.95. No Interest if paid in full in 6 mo on $99+ with PayPal Credit * Condition:

Find CHEVROLET 5.7L/350 Chevy small block Gen I Edelbrock Pro-Flo 4 EFI Systems and get Free Shipping on Orders Over $109 at Summit Racing! Edelbrock Pro-Flo 4 EFI systems provide you with a high performance traditional-style intake and 4150-style throttle body. Unlike regular throttle body EFI systems, Pro-Flo 4 features the fuel rails and individual injectors for each cylinder mounted on the ...

The 2014 Chevy Equinox is a reliable and dependable SUV that has been a favorite among drivers for years. But how long can you expect it to last? Here, we’ll explore the expected l...C10 EFI Conversion Kits. Showing 1 - 20 of 254. Sort By. Classic Performance Products Electric Fuel Injection Fuel Tank Installation Kit 340 LPH Pump/ Stainless Line. Review This Product. From $549.00. See Details. Holley Sniper EFI 2300 Self-Tuning Master Kit Shiny Finish. Rating:Holley/MSD is pleased to announce the release of two new of Small Block Chevy intake manifolds – one for EFI applications and one for carbureted engines. Holley's EFI SBC 4150 Single Plane EFI Intake Manifolds help provide a broad RPM power band for high-performance street/strip applications up to 7,500 RPM.Small Block Chevy 350 with Comp roller cam and Holley Siper #holley #compcams #sbc #edelbrock #chevrolet12370 Doherty St., Suite A. Riverside, CA 92503. (951) 340-2624. [email protected]. FiTech Fuel Injection is the leader in fuel injection systems for classic cars and trucks. Check out our featured products online.Dec 18, 2022 ... https://www.jegs.com/i/JEGS/555/16800/10002/-1 This EFI has me so excited! It was a super quick install and absolutely effortless to get ...While Bosch was working with Mercedes, Chevrolet was hard at work on a fuel injection system of their own. Developed and engineered through GM’s Rochester Products division, the Rochester Ramjet mechanical fuel injection system for Chevrolet’s 283 V8 engine in 1956, marketed for the 1957 model year. The OEM’s only utilized throttle body style injection for 9 years before transitioning to sequential port fuel injection for improved drivability and efficiency. Pro-Flo 4 EFI Systems feature a high performance Edelbrock intake manifold with a 1,000 cfm throttle body, fuel rails and individual injectors for each cylinder. Key to the improved ... The number 1 EFI conversion just got better. Thanks to Sniper 2 converting to EFI just got a whole lot easier. Sniper 2 is a brand new design from the ground up. We kept some of the tried and true features from the original Sniper, like our Self Tuning capability and the easy to use calibration wizard, while improving on virtually everything else. In …

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Jan 1, 2010 · The engineers at General Motors found the cure for all of the above mentioned problems by introducing electronic fuel injection, or TBI, at the tag end of the square-bodied C10's 15-year ... Find CHEVROLET 5.7L/350 FiTech Fuel Injection and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase ... Ultimate LS EFI, 500 HP, LS1/LS2/LS6, Without Transmission Controller, Kit. Part Number: FIF-70001. 3.23 out of 5 stars. Estimated Ship Date: Monday 5/13/2024.The dual plane design with larger than stock plenum and runners optimizes power from 1500 to 6500 RPM. All new design - the #1 EFI Conversion just got better! Sniper 2 is Part of the Sniper EFI Complete Ecosystem. Base Kit with no fuel system included. No PDM. Complete with 3.5" Handheld User Interface. Comes as a Kit.CHEVROLET 5.7L/350 Superchargers, Roots Style Kits. Filter by Availability ... Hydraulic Roller, 233/247 Duration at .050, 115 LSA, Cathedral Port, Chevy, Each. Part Number: FST-303011. Not Yet Reviewed. Estimated Ship Date: Jul 8, 2024 if ordered today. Drop Ship; Free Shipping; Special Order...Loading Estimated Ship Date: Jul 8, 2024 if ordered …Small Block Chevy Multi-Port Power Pack kit for Early/Late heads includes: Holley EFI single plane intake (2000-6500 RPM Power Band) and 1000 CFM Throttle Body New Holley Small Block Chevy Multi-Port Power Pack kits are partially assembled and do not include an ECU, harness, fuel pump, injectors or sensor connectors. These kits are intended to …Blueprint New Block Casting Cruiser Small Block Chevy Crate Engine 350 ci / 341 HP / 371 ft-lbs. TQ. $4649.00 - $8549.00. Shop Now.Replacement Wide-Band O2 Sensor. For EZ-EFI, EZ-EFI 2.0, XFI Sportsman or Air/Fuel Meter. View Details. $117.95. Ships Today. Lowest Price Guarantee. Add To Cart. With EZ-EFI from FAST, you don't need a laptop or tuning experience, just install the fuel injection kit to convert your carbureted application.Small Block Chevy Multi-Port Power Pack kit for Early/Late heads includes: Holley EFI single plane intake (2000-6500 RPM Power Band) and 1000 CFM Throttle Body New Holley Small Block Chevy Multi-Port Power Pack kits are partially assembled and do not include an ECU, harness, fuel pump, injectors or sensor connectors. These kits are intended to …This is the original 1979 350ci small-block. Not the picture of efficiency when new. When the truck was getting fed through the Quadrajet, my highway mileage was 10.5 to 11.0 miles per gallon. After installing the …EFI - Fuel Injection. Carburetors. Carburetor Components. Fuel Pumps Regulators and Filters. Also in Air & Fuel Delivery. Air Cleaners. Air Scoops. Cold Air Intake. Fuel System Kits. ….

With the conversion to multi-port fuel injection we should see a bigger improvement in fuel economy, along with more power potential. ... One Step at a Time – 1977 Chevy Nova with SBC 350. Carb-To-EFI Part1: GM TBI Fuel Only. Carb-To-EFI Part2: Adding Ignition Control (HEI8) Carb-To-EFI Part3: Converting to MultiPort Fuel Injection (MPFI) Find CHEVROLET 5.7L/350 Chevy small block Gen I Edelbrock Pro-Flo 4 EFI Systems and get Free Shipping on Orders Over $109 at Summit Racing! Edelbrock Pro-Flo 4 EFI systems provide you with a high performance traditional-style intake and 4150-style throttle body. Unlike regular throttle body EFI systems, Pro-Flo 4 features the fuel rails and individual injectors for each cylinder mounted on the ... Crate Engine, Dressed with Fuel Injection, Long Block, 383 Stroker, 436 HP, 443 TQ, New Block, Aluminum Heads, Chevy, Small Block, Each. Part Number: MLL-BP38318CTF1 5.0 out of 5 starsThe classic 350. Our 350 HO is assembled with all-new parts and high-flow heads, giving you more power than just about any production-spec Small-Block ever …Trick Flow® 465 HP Super 23® Top-End Engine Kits for Small Block Chevrolet TFS-K314-465-450. Head Combo, Rockers, Head Bolts, Cam, Button and Lock Plate, Pushrod Length Checker, Timing Set, Gaskets, Kit. Part Number:TFS-K314-465-450. Not Yet Reviewed. Estimated Ship Date:Aug 6, 2024if ordered today.May 10, 2023 · Summary. Holley’s Sniper EFI system is tough to beat in most situations. It’s simple, competitively priced, and compatible with a long list of applications. Pros. Covers most applications ... Jun 20, 2017 ... http://www.summitracing.com ) Finally, We Get Fuel Injection! Big Green 1985 Chevy K10 Project Ep.14 ( http://www.patreon.com/tflcar ) ...1.Comp Cams 54-470-11 Camshaft for 350 Chevy– Best Overall. SB Chevy B01N40WFI0 Cam & Lifter Kit– Seamless Sound. COMP Cams 12-602-4 Camshaft for 350 Chevy-High Compression Ratio. COMP Cams CL 12-206-2 Camshaft for 350 Chevy– Budget Friendly. COMP Cams CL 12-235-2 Camshaft for Chevrolet Small Block …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.May 10, 2023 · Summary. Holley’s Sniper EFI system is tough to beat in most situations. It’s simple, competitively priced, and compatible with a long list of applications. Pros. Covers most applications ... 350 chevy efi, With the conversion to multi-port fuel injection we should see a bigger improvement in fuel economy, along with more power potential. ... One Step at a Time – 1977 Chevy Nova with SBC 350. Carb-To-EFI Part1: GM TBI Fuel Only. Carb-To-EFI Part2: Adding Ignition Control (HEI8) Carb-To-EFI Part3: Converting to MultiPort Fuel Injection (MPFI), Crate Engine, Dressed with Fuel Injection, Long Block, 383 Stroker, 436 HP, 443 TQ, New Block, Aluminum Heads, Chevy, Small Block, Each. Part Number: MLL-BP38318CTF1 5.0 out of 5 stars, Jackpot LS EFI System - Master Kit with Tank Conversion Pump Module with Internal Regulator + 20' PTFE Hose Kit Sale price From $2,236.75 Regular price $3,171.16 On Sale! Jackpot LS EFI System - Master Kit with Tank Conversion Pump Module with Internal Regulator Sale price From $1,937.98 Regular price $2,766.95, Bolt-On Blow-Through EFI System easily makes over 900 HP On A Small-Block Chevy! When Steve Brule isn't busy co-hosting Engine Masters or dyno testing/tuning customer's engines, he's working with ..., Product Details. The Classic 350 to Drive Your Project! Chevrolet Performance’s 350 HO crate engine is a smart and powerful alternative to rebuilding. In fact, with its high-flow cylinder heads, a strong hydraulic camshaft and a four-barrel carburetor, it’s rated at 333 horsepower and 381 lb.-ft. of torque. That’s more power than almost ..., HyperSpark Ready-To-Run Distributors are the easiest and most cost-effective way to add plug-and-play ignition timing control to any Sniper or Holley EFI sys..., Oct 24, 2010 ... Is it very easy to take for example a chevy tahoe 350 vortec heads, intake, and efi setup and put it on a 72 small block 350 short block and ..., Leader in Fuel Injection, Ignition & More! Plumbing: Advanced Fluid Transfer Systems! Performance Crankshafts, Valve Train & More! ... Dyno tests showed gains of 5 hp and 9 ft-lbs. of torque over the Edelbrock …, Clearance. Home/. Holley’s Sniper EFI systems bring fuel injection to the masses with carburetor-replacement systems that are designed to have all the benefits of electronic fuel injection without breaking your bank. Perfect for street rods, hot rods, muscle cars, off-roaders and just about any carbureted vehicle, Sniper EFI will put an end ... , Feb 25, 2021 · Holley Sniper EFI 550-849 Holley Sniper EFI 2300 Self-Tuning Kit - Shiny. Using the Sniper EFI 2300 you can put an end to cold start issues, hesitations, vapor lock, and flooding on your Fairlanes, Galaxies, Falcons, Comets, F100s, Javelins, Rebels, Mustangs, Thunderbirds, Cougars and more. A Sniper kit is the #1 way to upgrade your classic to ... , FiTech Retro LS EFI 650 HP Fuel Injection Systems 37001. Fuel Injection System, Retro LS EFI 650 HP Self- Learning, Throttle Body, Injectors, ECM, with Transmission Controller, Kit. Part Number: FIF-37001. ( 1 ) Estimated Ship Date: Monday 5/13/2024. Free Shipping., Rejoice, California hot rodders— MSD was recently granted Executive Order Number D-722 from the California Air Resources Board (CARB) making the Atomic Fuel Injection System (part numbers MSD-2900 and MSD-2910) legal for use on 1987 and older GM passenger cars and trucks that came from the factory with a carbureted V8 engine., Technological Significance: Featuring Tuned Port Injection (TPI), the 350 L98 was Chevrolet’s first successful foray into the world of EFI (sorry L83 crossfire engine!). These computer-controlled engines delivered more precise control of fuel and spark, yielding better fuel mileage and crisp throttle response in the process., Looking for cookie business names? If you are trying to look for the perfect name for your new cookie business, here are some fantastic ideas to inspire you. If you buy something t..., Mar 27, 2022 ... This might sound bad, but this is a vehicle that has an official EPA Fuel Economy of 11 mpg city, and will absolutely perform that poorly if I ..., Properly Planning an EFI Installation. I was recently sent a referral from local engine builder Beck Racing Engines. Owner Frank Beck had sold a customer a 468 big-block Chevy and a FAST EZ-EFI system. …, Its main differentiating feature is the twin-throttle body fuel injection system that replaced the carburetor in older Chevy 350 versions. With the new fuel injection technology at its infancy, engines, where they were deployed, could only make it above 205 hp and 290 lb-ft of torque. , There are several variations of the Chevy 350 engine that come with different horsepower ratings. Chevrolet indicates that the deluxe model of its small crate engine has 290 horsep..., small block chevy 58x/4x crank/cam signal kit cmp timing cover double roller flat nose cam w/o cam thrust button sbc snout. eficonversions. $890. 1. 2. Use the Refine By PRODUCT TYPE filter to quickly browse products., The great American sports car is going electric. GM shared the news this morning, and released the first images of the upcoming electric Chevrolet Corvette. The great American spor..., A stock 350 motor can have as little as 145 horsepower and up to 370 horsepower in the LT1 model that was stock in the late 1960 Corvette. The Chevy stock 350 motor had a huge decr..., Are they asking what year the injection is? Early TPI used a MAF sensor, later TPI used a MAP sensor, which might require different wiring harnesses. -Dave. '70 Chevelle ZZ383 / 700r4 / 3.73 -- MS3X efi / Hotchkis A-arms & Springs / B-body 12" brakes / 1.25" F-body swaybar / UMI rears & swaybar / JGC PwrStrUpg. R., Base Smallblock Ford. Shown as shipped, with chromed velocity stacks, complete braided fuel lines, and pressure regulator, which can be mounted on the unit (as shown) or it can be mounted by you where you like it. …, Bolt-On Blow-Through EFI System easily makes over 900 HP On A Small-Block Chevy! When Steve Brule isn't busy co-hosting Engine Masters or dyno testing/tuning customer's engines, he's working with ..., 12. Though the RHS heads had more to offer with wilder cam timing, the 200hp upgrade relied on a set of CNC-ported AFR 195 heads. Even without the Competition porting, the AFR heads were capable ..., Jul 5, 2022 ... Heres my install and tune of a fitech 35205 force fuel efi on my c10 truck its got a sbc 350 with probably 10-11:1 compression a big cam and ..., The engine is 350 Chevy, very freshly rebuilt (maybe ran 2000 miles) it's bored 0.030" over. it's got flat top pistons (10:1) compression. but otherwise stock bottom end. The heads are aluminum from corvette, 113 casting if i'm correct. 58cc camber and 1.94"/1.5" valves., The Holley Sniper EFI Self-Tuning Master Kit is a highly recommended Chevy 350 fuel injection kit. Since no post-install tuning is required, it's great for beginners. Both two-barrel and four-barrel kits are available for engine that crank up to 800 horsepower. An alternative to EFI is throttle body injection. , Conversion kits 500 from EFI connection for coil per cylinder. Injectors 200-300. Manifold 200-500. Wiring harness and PCM 250-900. Tuning free - 300. Coils 100-200 can be bought new for 200 from EFI connection. The most cost is wiring harness conversion. If you can do it yourself you save about 600-700 dollars. Tuning really isn't …, Crate Engine, Dressed with Fuel Injection, Long Block, 383 Stroker, 436 HP, 443 TQ, New Block, Aluminum Heads, Chevy, Small Block, Each. Part Number: MLL-BP38318CTF1 5.0 out of 5 stars, Find CHEVROLET 5.7L/350 Chevy small block Gen I Distributors Male/HEI Distributor Cap Style, Ignition Box Required and get Free Shipping on Orders Over $109 at Summit Racing!, Thanks to today’s sophisticated management systems, Eight Stack fuel injection can be tuned to all but eliminate hard starting, plug fouling and the basically compromised air/fuel mixture associated with original downdraft carburetors. 289/302/347 Fuel Injection Systems. 351/427 Fuel Injection Systems. 427/428 FE Fuel Injection Systems., 1) Launch the Holley EFI software from the icon on your desktop. 2) Choose Open Global Folder. 3) Double-click on the Custom Calibrations (Cals) folder. 4) Double-click on the “496 650HP” (or other applicable engine) Global Folder. To prevent making changes to this tune, make a copy of this global folder, which is specific to your ...