Vic Edelbrock Sr, and Jr, are both rolling over in their graves. The idle set screw had the idle at 900rpm, no adjustment done. Edelbrock calls the high-speed circuit the inner circuit because of the location of the bleed on top of the carburetor, and because the three small emulsion bleeds are located on the innermost side of the metering block. We have the new Edelbrock VRS-4150 race carburetor on the bench to do an in-depth analysis as to why this could be the greatest off the shelf carburetor ever built. Normally found only in high end racing carbs, the VRS includes fully adjustable intermediate fuel circuits, which help to provide incredible throttle response. Part Number: EDL-1307. ;) I like beer! IDEAL FOR RACE & PERFORMANCE APPLICATIONS! The VRS-4150 carburetors are street friendly but race readyand the one-piece, cast aluminum bodies fit all 4150 and 4500 carb flange manifoldswithout requiring an adapter plate. Features, specs, and benefits: * A street throttle arm, PTFE-coated throttle shafts and built-in provisions for a standard GM three-wire TPS mount add features to the carburetor that are ideal for any user * Multiple vacuum hook-ups keep this carburetor usable on the street but still ready for the track with larger capacity fuel bowls and four circuit billet metering blocks with screw-in emulsion bleeds * The 20 percent larger capacity fuel bowls feature internal ribs to control fuel slosh, and a sculpted baffle directs incoming fuel to the sides to minimize bubbles * The floats have corner cuts to avoid shutting off the fuel flow during hard cornering, and jet extender notches and jet extenders in the rear to keep the jets covered in fuel under hard acceleration * Users are able to externally adjust idle bypass air as the adjustment screws are accessible without removing the air cleaner/scoop * The advanced idle circuit features interchangeable idle discharge jets in all four corners to allow for a smooth, clean idle with the use of big, low-vacuum camshafts * Normally found only in high end racing carbs, the VRS includes fully adjustable intermediate fuel circuits, which help to provide incredible throttle response * For greater control at high rpm, the high speed/main fuel circuit is split into two bleed circuitsone each for the lower and upper sections * As an additional feature, the power valves are located on both primaries and secondary's that support optimized jettingthe power valve will add fuel as necessary while the power valve protection circuit prevents diaphragm damage from backfires, Questions & Answers margin: auto; They didnt give me a script they didnt give me any parameters other than I had to call it by its name which is a VRS! The power valve will add fuel as necessary while the power valve protection circuit prevents diaphragm damage from backfires. It's an impressive piece of engineering, but considering how easily a double pump 750 can be dialed in, I dont know if all the extra tuning is real-world beneficial. View All Reviews, Instruction Sheets for Part Number EDL-1308, Some parts are not legal for use in California or other states with similar laws / regulations. What Happened to Edelbrock's new VRS-4150 Carburetor? } Home; About; Services; Gallery; Contact Edelbrock VRS-4150 Race & Performance Carburetor #1307 750 CFM is street friendly but race ready. Finally, for greater control at high RPM, the high speed/main fuel circuit is split into two bleed circuits one each for the lower and upper sections. The new Edelbrock VRS 4150 carburetor was the highlight of our stop at Edelbrock's booth at the 2021 PRI show. Edelbrock calls the high-speed side of the main metering circuit the inner because of its inboard location on the metering block. With the new VRS Series carburetors many attributes, they make for easy tuning and great versatility in many applications. Carburetor - VRS-4150 - 4-Barrel - 650 CFM - Square Bore - No Choke - Mechanical Secondary - Dual Inlet - Black Anodized / Natural - Each . /* see gallery_shortcode() in wp-includes/media.php */. width: 100%; 12 port annular boosters on all four corners! Edelbrock supplied this map that identifies all four of the metering circuit air bleeds for each venturi. Edelbrock VRS-4150 Race & Performance Carburetor #1306 is race ready with four circuit billet metering blocks for full tuning capability and street friendly with a universal fit throttle arm, vacuum fittings and provisions for a TPS sensor. The reason for this is to give the tuner the maximum amount of fuel-curve adjustability. by HQM383 Wed Feb 23, 2022 1:05 am, Post Other obvious exterior enhancements include the four air bleeds astride each venturi. Carburetor includes 4-circuit billet metering blocks, externally adjustable floats with 4-corner idle. Edelbrock VRS-4150 Race & Performance Carburetor #1306 is race ready with four circuit billet metering blocks for full tuning capability and street friendly with a universal fit throttle arm, vacuum fittings and provisions for a TPS sensor. These are air bypass idle speed adjustment screws. History and a century of metering improvements have proved this notion to be inaccurate. | Normally found only in high end racing carbs, the VRS includes fully adjustable intermediate fuel circuits, which help to provide incredible throttle response. The VRS-4150 is the all-new, highly-adjustable, four-barrel carburetor from the design team at Edelbrock. } Some race carburetors add a third called an intermediate circuit. Current Stock: . - https://amzn.to/2RkHUJeGimbal - https://amzn.to/2wg8SbcMy Amazon Store - https://www.amazon.com/shop/bonehead#edelbrock #edelbrockvrs #racecarb and 0.670-inch outside diameter (o.d.) border: 2px solid #cfcfcf; The 3.75"-tall cast aluminum main body fits all 4150 and 4500 carb flange manifolds without requiring an adapter plate. As the fuel level in the float bowls drops during a full-throttle dragstrip pass, for example, these bleeds are uncovered, which introduces air into the main metering circuit from the high-speed bleed. To learn more, view our booster pins available (part nos. This increases structural integrity, requires fewer parts, and eliminates the gasket between the main body and the throttle plate. #gallery-1 .gallery-caption { Filter by Availability Filter Results . Edelbrock VRS-4150 Race & Performance Carburetor #1306 is race ready with four circuit billet metering blocks for full tuning capability and street friendly with a universal fit throttle arm, vacuum fittings and provisions for a TPS sensor. They allow tuners to adjust idle speed without interfering with the throttle blade curb-idle position relative to the idle fuel transfer slot. A street throttle arm, PTFE-coated throttle shafts and built-in provisions for a standard GM three-wire TPS mount add features to this carburetor that are ideal for any user. Edelbrock calls this a "mustache" because of its shape, which is designed to mitigate fuel slosh. We use cookies to provide you with the best possible user experience. Description; Edelbrock - 1306. Stay Updated with Emails from Summit Racing. Our photos are of an early-production 750-cfm model that includes annular boosters, but there is a drop-leg standard booster also available, and the boosters are designed to be easily replaced. By introducing more circuits into the carburetor, the carburetor tuner can reshape the curve for more or less fuel in a specific area. For the best experience on our site, be sure to turn on Javascript in your browser. Finally, for greater control at high RPM, the high speed/main fuel circuit is split into two bleed circuits - one each for the lower and upper sections. shipped as quickly as possible. Above Left:The VRS-4150 carbs are available in 650-, 750-, 850-, and 950-CFM ratings. Edelbrock has put millions of dollars into developing a 4150 that has all of the features of the best aftermarket 4150 and Dominator performance carburetors and the ease of use of the best street rod carburetors. They are making a 4150 carburetor! For more information, visit www.P65warnings.ca.gov. This allows for the simple addition of a TPS to use an electronically controlled overdrive automatic, or it could be used for data-logging throttle position for circle track or road course work. Terms of Use | Privacy and Security | Site Accessibility The carburetors are available in 650-, 750-, 850-, and 950-CFM models to meet the airflow requirements of any engine. Quick view. For the best experience on our site, be sure to turn on Javascript in your browser. Ok, I didn't realize it was dimensionally that different from a traditional 4150. To learn more, view our by Walter R. Malik Wed Jun 22, 2022 11:00 am, Post margin-top: 10px; #gallery-1 img { by ProPower engines Tue Jun 21, 2022 2:31 am, Post One was the VRS-4150 with a video and pdf. They know that if they make a new carburetor based on a platform that has been around for a long time then people can use their parts and their tuning knowledge and this wont be so hard to get into and they can save some money. This is fuel in addition to what is delivered by the low- and high-speed main metering circuits. Edelbrock calls the VRS-4150 a four-circuit carb because in addition to the idle and intermediate circuits, engineers split the main metering circuit into two separate channels on the metering block for low- and high-speed tuning at wide-open-throttle (WOT). Related: 10 Biggest Carburetor Tuning Mistakes. They handed this to me and just said its yours do whatever you want with it. by 1980RS Wed Jun 22, 2022 2:22 pm, Post A street throttle arm, PTFE-coated throttle shafts and built-in provisions for a standard GM three-wire TPS mount add features to this carburetor that are ideal for any user. The VRS-4150s have billet four-fuel circuit metering blocks, an intermediate circuit on both the primary and secondary bores, and a split high-speed main circuit, allowing greater high RPM bleed control. so you can do data logging or for people who are running newer transmissions that need that TPS for the kickdowns. by Walter R. Malik Tue Jun 21, 2022 7:20 pm, Post by Truckedup Wed Jun 22, 2022 10:25 am, Post Edelbrock VRS-4150 Race & Performance Carburetor #1306 650 CFM is street friendly but race ready. They are a large banjo style with a pressed internal annular ring., #gallery-2 { Check the Fit, Estimated USA Ship Date: I'm so stoked to be able. This is a widgetized sidebar area and you can place any widget here, as you would with the classic WordPress sidebar. The carbs have increased capacity fuel bowls with slosh control baffles and fuel bowl drain screws. So if we add up all the circuits, we now have a total of four circuits: idle, intermediate, a low-speed metering, and a high-speed main metering. #gallery-4 img { By continuing to use our site, you agree to their use. so we reversed the change and then added one more Jet size , .074 to .075Sweep 26: 610hp@5700, 637ftlbs@4400 AFR 12.15-13.13 Best tq the motor has made. Multiple vacuum hook-ups keep this carburetor usable on the street but still ready for the track with larger capacity fuel bowls and four circuit billet metering blocks with screw-in emulsion bleeds. Cookie Policy. Straight out of the box with one jet change, this 750cfm VRS made the best HP and TQ this motor has seen, beating a race tuned Holley/Pro-Form 830cfmEdelbrock is letting us be a distributor!!!! margin-left: 0; Last weekend I was at the big local car show and Edeljunk had their display booth there. Image is a representation of this item. The Edelbrock VRS-4150 features like external idle air adjust allow for easy tuning and great versatility in many applications. VRS-4150 SERIES PERFORMER SERIES MARINE SERIES MANIFOLD & CARB KITS CARB ACCESSORIES HUGE BENEFITS THE FUTURE OF CARBURETION! WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm. JavaScript seems to be disabled in your browser. All rights reserved. https://www.patreon.com/musclecarsolutionsNew video cam! Changing the main jets will move the fuel curve up or down, but it does not really change its shape. Please check them outhttps://www.facebook.com/search/top?q=venice%20auto%20marineTested the VRS-4150 on 512ci Mopar BB, 10.75 compression, Trickflow 240 heads, 1.5 roller rockers on hydraulic roller cam, Comp Cam 440-252258 (.571, 252I 258E @.50, 110deg), Victor 440 single plane, 2 into 3.5 fender well headers, timing (18deg initial, all in by 2100 35deg total), 93 octane. With the new VRS Series carburetors many attributes, they make for easy tuning and great versatility in many applications. Edelbrock calls this a four-circuit carburetor and we'll get into that definition a little bit later in this discussion. /* see gallery_shortcode() in wp-includes/media.php */. You can order this part by Contacting Us. We use cookies to provide you with the best possible user experience. Sign up for a free trial to MotorTrend+ today and start watching every episode of Engine Masters, plus much more! It has dual fuel Inlets on both sides with AN fittings. The idle bypass system eliminates the need to drill holes in the throttle blades to allow additional air, and maintains the proper throttle blade orientation to the idle transfer slot. Above: This is the second of two labeled views Edelbrock provides of their VRS-4150 carburetors. Called Edelbrock, recommended changing the inner most air bleeds from .030 to .026Sweep 25: 608hp@5700, 635ftlbs@4400 AFR 12.53-13.54This change gained 8ftlbs, however it leaned the mixture .2-.4 across the range. Ever wonder what those camshaft specification numbers really mean and how they affect engine performance? margin-top: 10px; by 1980RS Tue Feb 22, 2022 9:30 pm, Post Edlebrock 1307 VRS-4150 Carburetor Features: 4-circuit billet metering blocks with screw-in emulsion bleeds 20-percent larger-capacity fuel bowls with internal ribs that control fuel slosh Sculpted internal baffles direct incoming fuel to the sides to minimize bubbles Corner cuts on the floats to avoid fuel flow shut-off during hard cornering #gallery-1 { } #gallery-2 .gallery-item { To learn more, view our There are several boosters to choose from and they are easy to change by removing these booster stakes (arrows). To learn more, view our, Skip to the beginning of the images gallery, Carburetor Stud Kit #8008 Zinc Finish 5/16-18 x 1 1/2in, Carburetor Stud Kit #8024 Zinc Finish 5/16-18 x 1 3/4in. Along those same lines, the secondary fuel bowl uses jet extensions to ensure the jets are covered in fuel during hard dragstrip launches. Edelbrock is releasing this BRAND NEW VRS-4150 carb and let us Dyno it! May 3, 2022 They are not available yet, but do have the nice idle circuit adjustment. } again people who know aftermarket carburetors and have gone from a single dog leg to an annular booster carburetor know what that does and know how that improves the throttle response and the snappiness and its on all four corners now! These are idle bypass adjustments positioned on both sides of the main body. I really mean that. Face Book: https://www.facebook.com/RileysJeepProject/Shopify: https://rileysrebuilds.myshopify.com/collections/allThe Dyno testing was at VAMI Venice Auto Marine. it is solving a massive problem in the carburetor industry and when I say they are trusting me to do this. Summit Racing will BEAT any competitor's advertised price! We use cookies to provide you with the best possible user experience. text-align: center; Investigating the passenger side of the carburetor reveals a throttle position sensor (TPS) fixture, which is very handy if this carburetor will be used along with an electronically controlled automatic transmission like a 4L60-70 Series or 4L80E. To paraphrase a line attributed to author Samuel Clemens (better known as Mark Twain), the rumors of the carburetor's demise have been greatly exaggerated. 641192), will fit properly. Edlebrock VRS-4150 Series Race and Performance Carburetors suit a variety of applications from street cruisers to performance track use. If you want to get on the wait list and be one of the first, please comment below or message me on face book. GO EDELBROCK!!!! } If it is time to install a new carburetor, choosing an Edelbrock VRS-4150 is the correct move. This is a custom order part. Ask a Product Question. The low-speed bleed is identified as the outer for its outer location on the metering block. The store will not work correctly in the case when cookies are disabled. As an additional feature, the power valves are located on both primaries and secondaries to support optimized jetting. Edelbrock VRS-4150 Race and Performance Carburetors 1306 Carburetor, VRS-4150, 650 cfm, 4-Barrel, 4150 or 4500 Flange, Manual Choke, Annular Boosters, Satin, 4-Corner Idle, TPS Provision, Each Part Number: EDL-1306 Not Yet Reviewed Estimated Ship Date: Today Free Shipping $789.95 Add To Cart Compare Wish List Our Tech Support Agents are second to none. Not so uncommon to see a broken Holley baseplate.. in this situation, it appears that the baseplate is part of the main body. Add to Wishlist. ! by Justa1time Tue Feb 22, 2022 11:02 pm, Post Additionally, for those that require throttle angle computer feedback, the carburetor body has a provision for a standard GM 3-wire throttle position sensor (TPS), which Edelbrock sells separately (part no. Technical Contributor By continuing to use our site, you agree to their use. The floats have corner cuts to avoid shutting off the fuel flow during hard cornering, and jet extender notches and jet extenders in the rear to keep the jets covered in fuel under hard acceleration. Im a Street/Strip guy.. like to think outside the quadrilateral parallelogram. We can answer any of your tech inquiries! | By continuing to use our site, you agree to their use. shipped as quickly as possible. dba Summit Racing Equipment | Trademarks, Everything You Need for Anything You Drive. Cookie Policy. We use cookies to provide you with the best possible user experience. by 408swinger Wed Jun 22, 2022 3:16 pm, Post Traditionally, this is called a downleg booster, but by design, the fuel in our boosters follows a straight path. We warmed up the motor on a Holley/Pro-form 850, made several jet changes, best power 607hp, 623tqFindings:We bolted the carb down right out of the box, no adjustments. margin: auto; Gallery: Lance Hegedus 1970 Dodge Challenger T/A Survivor. HOLLEY PERFORMANCE Carburetor Repair Kit Holley 37-485 (H) $49.00 Trending at $57.88 HOLLEY CARBURETOR NON STICK FUEL BOWL METERING BLOCK GASKET 2300 4150 4160 4500 $11.99 Trending at $20.00 Carburetor Carb Base Plate Gasket 4 HOLE Flange HOLLEY EDELBROCK 5 PACK G0 $9.95 Trending at $14.15 Quick Fuel Fuel Pressure Regulator 30-803QFT $37.19 fie . The ends of the floats are beveled to also help stabilize the float position during high-g turns for circle track or road course applications. A street throttle arm, PTFE-coated throttle shafts and built-in provisions for a standard GM three-wire TPS mount add features to this carburetor that are ideal for any user. We use cookies to provide you with the best possible user experience. } The accelerator pump circuit nozzles are also located in the traditional position. Today, The new line of Edelbrock VRS-4150 Race and Performance carburetors are packed with features that will appeal to racers, engine builders and carb tuners, as well as the hot street enthusiast looking to improve performance. This eliminates the attaching screws and the gasket. Multiple vacuum hook-ups keep it usable on the street but still ready for the track with larger capacity fuel bowls and four circuit billet metering blocks with screw-in emulsion bleeds. We have the new Edelbrock VRS-4150 race carburetor on the bench to do an in-depth analysis as to why this could be the greatest off the shelf carburetor ever built. The power valve will add fuel as necessary while the power valve protection circuit prevents diaphragm damage from backfires. by Seanh832 Tue Jun 21, 2022 1:49 am, Post As we will see, there is an enormous amount of flexibility built into this fuel mixer. AFR flattened out mid 12s 90% of the range. This is what they had to say about the newly designed VRS-4150. $5 Off Your $100 Mobile App Purchase - Get the App. Right off the bat everyone including me is a little bit shocked that this is not the Performer or AVS platform. In most domestic performance carburetors, the main metering circuit is the one that delivers fuel through the booster. The fuel bowls received significant attention with a curved fuel dam placed just below the needle and seat. Our photos are of an early-production. Apr 25, 2023, Estimated USA Ship Date: I'm so stoked to be able to show this to you. This system is velocity sensitive, so at small throttle openings it is not very active but continues to add fuel as air speed through the carburetor increases. text-align: center; The VRS-4150 carburetors are street friendly but race readyand the one-piece, cast aluminum bodies fit all 4150 and 4500 carb flange manifoldswithout requiring an adapter plate. The store will not work correctly in the case when cookies are disabled. On episode 19 of Engine Masters, David Freiburger explains cam lift, duration, lobe separation angle, and installed centerline. View Details The advanced idle circuit features interchangeable idle discharge jets in all four corners to allow for a smooth, clean idle with the use of big, low-vacuum camshafts. #gallery-3 img { Edelbrock VRS-4150 Race and Performance Carburetors, Carburetor, VRS-4150, 850 cfm, 4-Barrel, 4150 or 4500 Flange, Manual Choke, Annular Boosters, Satin, 4-Corner Idle, TPS Provision, Each Finally, for greater control at high RPM, the high speed/main fuel circuit is split into two bleed circuits one each for the lower and upper sections. #gallery-4 .gallery-caption { The store will not work correctly in the case when cookies are disabled. The floats have corner cuts to avoid shutting off the fuel flow during hard cornering, and jet extender notches and jet extenders in the rear to keep the jets covered in fuel under hard acceleration. The advanced idle circuit features interchangeable idle discharge jets in all four corners to allow for a smooth, clean idle with the use of big, low-vacuum camshafts. Edelbrock VRS-4150 Race and Performance Carburetors 1306 Carburetor, VRS-4150, 650 cfm, 4-Barrel, 4150 or 4500 Flange, Manual Choke, Annular Boosters, Satin, 4-Corner Idle, TPS Provision, Each Part Number: EDL-1306 Not Yet Reviewed Estimated Ship Date: Today Free Shipping $789.95 Add To Cart Compare Wish List Note that there is no separate throttle plate. One final feature is the power valves that are located on both primaries and secondaries that support optimized jetting. Once they are available I will have them on My Shopify account, link below. } That small brass tube is the fuel discharge tube for the intermediate circuit. Reinforcing the idea that "carbs are not dead!" has gotten the racing industry abuzz, and some of our favorite publishers and builders are weighing in. All of these features make for easy tuning and great versatility in many applications. Might be trying to get it down to 20 tunable bleeds per metering block What is less obvious is the -inch-taller main body, visible in the extra space between the main body and the top of the metering blocks. Sweep 24: 614hp@5500, 628ftlbs@4500 AFR 12.30-13.22Best hp motor has ever made. I've called Edlebrock 3 times this year inquiring about the VRS 4150 and they haven't been given a release date yet. This standard booster is relatively small with a 0.385-inch i.d. margin: auto; 36018). Theres an idle circuit, a transition throttle, a mid throttle and a wide open throttle circuit! - https://www.instagram.com/muscle_car_solutions/Wanna buy me a beer? The 3.75-tall cast aluminum main body fits all 4150 and 4500 carb flange manifolds without requiring an adapter plate. https://www.edelbrock.com/vrs-4150-carburetors. Mar 21, 2023 For the best experience on our site, be sure to turn on Javascript in your browser. Despite the fact that we're well into the second decade of the 21st century, carburetors are still very much en vogue on both sides of high-performance, the street and the racing scene. Our core products are made in the USA offering unsurpassed quality and performance. Reviews Normally found only in high end racing carbs, the VRS includes fully adjustable intermediate fuel circuits, which help to provide incredible throttle response. Estimated International Ship Date: Edelbrock VRS-4150 Race & Performance Carburetor #1307 is race ready with four circuit billet metering blocks for full tuning capability and street friendly with a universal fit throttle arm, vacuum fittings and provisions for a TPS sensor. To learn more, view our. Edelbrock VRS-4150 Race and Performance Carburetors 1307 Carburetor, VRS-4150, 750 cfm, 4-Barrel, 4150 or 4500 Flange, Manual Choke, Annular Boosters, Satin, 4-Corner Idle, TPS Provision, Each. The Edelbrock VRS-4150 Carburetors features a street throttle arm, PTFE-coated throttle shafts and built-in provisions for a standard GM three-wire TPS mount add features to this carburetor that are ideal for any race or ultra high-performance applications. The distance between the fuel inlet fittings is slightly longer than a typical 4150 carburetor, but not quite to the spread of a 4500 carburetor, so this will require a specific, custom-length fuel feed-hose. The VRS-4150 will be a pleasure to tune with Edelbrocks latest carburetor innovations. A typical carburetor will feature two circuitsone idle and the one main metering circuit. Apr 25, 2023 Gallery: Wicked Wedge of The South 535ci Stroker Bottom End Gallery: Bulletproofing a 727 Torqueflite With TCI Auto, Directly Connected Partners With Mike Petralias Hardcore Horsepower. The 3.75"-tall cast aluminum main body fits all 4150 and 4500 carb flange manifolds without requiring an adapter plate. Beyond the four circuits, there are many more interesting details to be found in Edelbrock's VRS-4150. Used the search function and found this https://www.edelbrock.com/vrs-4150-carburetors Looks as though still not to market. All of this makes for easy tuning and great versatility in many applications. This map identifies all the main circuit bleeds except for the intermediate circuit. Now, well into the 21st century, the carburetor's image has been further enhanced with Edelbrock's recent introduction of a brand-new, highly refined four-barrel they call the VRS-4150. by CamKing Wed Jun 22, 2022 9:59 am, Post A street throttle arm, PTFE-coated throttle shafts and built-in provisions for a standard GM three-wire TPS mount add features . These are the main components disassembled on the VRS-4150. Chris has been a college professor for 24 years; the last 19 spent at Pennsylvania College of Technology in Williamsport, PA. During the day Chris instructs automotive HVAC and electrical/electronic classes, and high-performance classes, which include the usage of a chassis dyno, flow benches, and various machining equipment. They gave me no boundaries here. /* see gallery_shortcode() in wp-includes/media.php */. Late last year, Edelbrock introduced an all-new VRS-4150 Race and Performance carburetor line at the SEMA show. text-align: center; By continuing to use our site, you agree to their use. We (Edelbrock) have replacement 0.140-, 0.150- and 0.160-inch inside diameter (i.d.) In stock SKU 1307 BUY DIRECT AND GET: Fast Shipping Tech Support Easy Returns High-Quality Details } Estimated International Ship Date: These will be available in 30 days. The fuel bowls include a separate fuel-drain fitting, and another obvious difference are the small adjustment screws in the middle of the carburetor body, just below the rim. To protect the power valve against damaging backfires, Edelbrock included built-in power valve protection. The VRS-4150 Carb features 20% larger capacity fuel bowls with internal ribs providing many benefits that can help increase performance. Actual item may vary.