difference between spread bore square bore carburetor

There are a few things to look for: A carburetor needs enough fuel pressure to atomize the fuel and deliver it to the engine. Aren't Eddy Carbs all square bore bore ? What is the exposition of the blanket by Floyd dell? The smaller bore diameter allows less air to flow into the engine, resulting in less power. I already have the edelbrock performer rpm air gap #7501 but its square bore and i want to put my 69 rochester quadrajet on it, does any know what adapter i need? WebAmazon.com: square bore to spread bore adapter 1-48 of 102 results for "square bore to spread bore adapter" RESULTS Price and other details may vary based on product size and color. As the engine speed increases, the diaphragm moves and allows more fuel to enter the carburetor. But the Street Demon carb seems like a good street, square bore carb, similar to the TQ. I believe a spreadbore has much larger secondary venturies. Instead, it uses a sensor to monitor the fuel level in the bowl. WebA spread-bore intake manifold will have provisions for the mis-matched throttle bores so when you bolt down a square-bore four-barrel carburetor, the throttle bores wont line up. You can use a square bore carb on an after market spread bore manifold with a shim adapter plate. Spread bores are better for the street. A lack of low-end torque will make it tough to drive. It's easier to put a straightbore carb on a spreadbore manifold than the other way around. The primaries generally run a little lean on power application, idleing, crusing at highway speeds for just I've used square bore and spreadbore carbs on a performer manifold. The intake Square carburetors have equally spaced and sized throttle bores, while split carburetors have two smaller primary bores and two larger secondary bores. There are two main types of carburetors spread bore and square bore. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register. Spread bore carburetors typically offer quicker throttle response than square bore carburetors due to their increased airflow. JavaScript is disabled. And fwiw, I honsetly think a good Q-Jet that is RIGHT for the engine combination is about as good as it gets for a Powerful STREET motor. THanx Josh, Unless I'm missing something (very possible. Now the Edelbrock and Weber engineers have refined these classic carbs while retaining their original replacement status. With a good street combo, such as a small block with a small RV cam, headers, 9:1 compression and the correct tune up pieces the small primaries make for fuel injection like real sensitive throttle response. The secondaries are much larger and used when max Personally, my favorite spreadbore carb would be the Chrysler Thermo-quad. others make after market intake maniflods that have large bores for A forum community dedicated to hot rod owners and enthusiasts. So, which carburetor is better for your automobile? Your email address will not be published. When the sensor detects that the fuel level is low, it sends a signal to a pump that injects fuel into the carburetor. These include: Lets take a closer look at each of these factors: The main difference between spread bore and square bore carburetors is how they airflow. Square bore means all 4 openings, primary and secondary, on the carb to let fuel & air are the same diameter. As the fuel level in the bowl gets low, the float drops and allows more fuel to enter. caruretors. There are adapters you can buy but they only allow the carbs to work with the wrong manifold. The smaller bore diameter allows less air to flow into the engine, resulting in less power. A forum community dedicated to hot rod owners and enthusiasts. , you can also adjust the carburetors main jet. to adjust the carburetor is to change the idle speed. Simple. You can adjust your carburetor to reduce fuel consumption in several ways. The process of moving from one open window to another is called what? but I did not think so, hopefully the OP can give us a look at his and help solve this Mopar Mystery. For a better experience, please enable JavaScript in your browser before proceeding. in a search for that intake, it looks like a performer, I happened across this one matt, square bore in this case, not sure if there is a spread bore version? A carburetor works by mixing fuel and air to create a combustible mixture. The Fora platform includes forum software by XenForo, http://www.thecarburetorshop.com/Cart9800.jpg, http://site.mawebcenters.com/ksautoperformancestore/_thumbnails/hly-0-80457s_w_thumbnail.gif, http://marineengineparts.com/shopsite_sc/store/html/media/EDL2696.jpg, http://hotrodders.com/gallery/showphoto.php/photo/12552, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. in a search for that intake, it looks like a performer :thumbup: The eddy LD340 takes a square bore carb in which the primary and secondary throttle plates are the same size. The secondaries begin to open when the throttle is On some hot This design provides good airflow and is often used on high-performance engines. To put it into perspective, the main and secondary venturis of a square bore carburetor are both around the same diameter. Spread bore carburetors, on the other hand, are typically more suitable for smaller engines. carburetor's venturi's are of equal size, ie 4 holes of the same The advantage of this design is that it allows for a more even distribution of fuel throughout the cylinder, which leads to better combustion and more power. Spread bore intake manifolds match that shape to accomodate the larger venturis toward the back. Ok, don't quote me on the exact reason for the differences, but it's like this - spreadbore = butterfly shaped opening sqarebore = 4 holes squarely aligned Now, why the difference? Flex Fuel VS Ecoboost; Which Engine Has The Most Benefits. there is a small loss in performance potential when the carb and As the engine speed increases, the diaphragm moves and allows more fuel to enter the carburetor. Now..wats the difference between a spread bore, and square bore. through linkage designed to provid sequencual opening. If you wish to lower. Are you that little of a man? It depends on your engine type and performance needs. If you wish to lower the rpm range by using longer runners, go with a dual-plane intake. The spring is heated by exhaust gases flowing through the transition duct. Separate Choke On a separate choke setup, the metal spring is located in the intake manifold. That's why Edelbrock has so few part numbers to cover most all applications, unlike holly. These bores handle the general cruise mode operation and normal easy driving. Mark 1970 SS396 Lewis Racing Engines ( Wolfplace) 489: 634 HP @ 6000rpm 627 Lb-ft @ 4,000rpm ProSystems SV1 Gear Vendors Overdrive Moser 12 Bolt Alumitech Radiator Their design features two side-by-side throttle plates that can be opened independently of each other. An engine is described as undersquare or long-stroke if its cylinders have a smaller bore (width, diameter) than its stroke (length of piston travel) giving a ratio value of less than 1:1. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'motopickers_com-mobile-leaderboard-1','ezslot_17',113,'0','0'])};__ez_fad_position('div-gpt-ad-motopickers_com-mobile-leaderboard-1-0'); Motopickers assists auto mechanics, and car owners locate the most up-to-date and reliable information on the maintenance and repair of all sorts of vehicles. If you will be able to see it and want it to look good, go find another carb. This carburetor is typically found on larger engines, such as those used in trucks and buses. Great carb, a little work on them and they can flow 1000+ CFM. No, Edelbrock does not make a spread bore carb. A spread bore carburetor is a type of carburetor that has a wider opening at the bottom than at the top. together, generally for strictly perfomance motors where fuel Some distinguishing features of the Series I "spread-bore" compared to the "siamese-bore": wider spaced pipes on the exhaust manifold. Square bore and spread bore are terms used for 4 Barrel caburetors and the matching intake manifolds the carburetors are mounted on. The secondarie are open by vacum or flow through The barrel carburetor is similar to the float carburetor but has more than one barrel. So how do you tell if a carburetor is rich or lean? Hey guys, what do you think works better: an Edelbrock Performer or Performer RPM spread-bore intake manifold with a spread-bore carb like a Thermoquad, or an Edelbrock Air Gap square-bore manifold with a Quadrajet or the equivalent carb? Spreadbore has the secondaries a lot bigger than the primaries (i.e, typical quadrajet), square bore has secondaries the same size as the primaries (i.e, typical holley). if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'motopickers_com-box-4','ezslot_13',102,'0','0'])};__ez_fad_position('div-gpt-ad-motopickers_com-box-4-0'); A spread bore intake is an intake manifold that has a carburetor with large bore diameter. Choose a dual plane intake for better idle quality, off-idle throttle response and better distribution of air/fuel charge to the cylinders at low rpm. Use a carburetor cleaning kit to clean the inside of the carburetor. What Is The Dodge Ram Engine Replacement Cost? The exhaust may be lighter than normal if the mixture is too lean. They were popular in the 1970s and 1980s, but have since fallen out of favor due to their poor fuel economy. //Shop at FPAUTOPARTS.COM-Shop Holley Parts at https://fpautoparts.com/holley-Shop Squarebore parts at https://fpautoparts.com/search/?query=square-bore-Shop Spreadbore parts at https://fpautoparts.com/search/?query=spread-bore//Follow us on our social pages//https://www.facebook.com/firstplaceautoparts/https://www.instagram.com/firstplaceautoparts/ Rarely are they open by They will not work properly or well. $5 Off Your $100 Mobile App Purchase Carburetor Adapter, Open Center, Spread Bore Carburetor, Square Bore Manifold, 1.000 in. manifolds match the bore sizes specifically for each type carb. The carburetor also has a needle and seat that regulate the flow of fuel into the float bowl.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'motopickers_com-leader-2','ezslot_9',109,'0','0'])};__ez_fad_position('div-gpt-ad-motopickers_com-leader-2-0'); There are several types of carburetors, including: The float carburetor is the most common type of carburetor. 2,222 views Nov 11, 2021 A question we get a lot here at First Place is what is the difference Thick, Each. https://www.motortrend.com/how-to/1202phr-10-biggest-carb-mistakes/, https://www.edelbrock.com/quadrajet-carburetor-replacement-adapter-kit-2697.html, https://www.jegs.com/s/tech-articles/carburetor-intake-manifold-guide.html&title=Carburetor+Intake+Manifold+Guide, https://www.holley.com/products/fuel_systems/carburetors/specialty_carburetors/emissions_replacement/parts/0-6210, https://www.motortrend.com/how-to/intake-manifold-single-double-plane/, https://www.holley.com/blog/post/how_to_choose_your_next_holley_carburetor_/, https://www.summitracing.com/parts/edl-1406, https://www.motortrend.com/how-to/1610-making-your-quadrajet-perform-like-it-should/, https://www.youtube.com/watch?v=xZqdYXBl8fo, https://www.youtube.com/watch?v=FFWoEozSk3U, https://www.amazon.com/Holley-0-4779C-Mechanical-Secondary-Carburetor/dp/B00029J4GK, https://help.summitracing.com/app/answers/detail/a_id/4722/~/carburetor-choke, https://www.onallcylinders.com/2019/07/18/holley-4150-carb-vs-4160-carb/, https://www.holley.com/blog/post/how_to_identify_your_holley_or_demon_carburetor/, https://www.corvetteforum.com/forums/c3-tech-performance/1272681-quadrajet-secondaries-don-t-kick-in.html, https://jetchip.com/dragzine-rebuilding-the-quadrajet-carburetor-yes-they-are-worth-it/. intake maifold are not matched adapters work but not quite as The Edelbrock 1406 has an electric choke and fits your intake manifold with a square bore flange. I disagreed with his response on this thread and he went back into a ton of old threads and clicked disagree on 37 responses I made. What does a spread bore manifold look like? The engine may overheat if the mixture is too lean. I've always used Holley 650 double pumpers on my small blocks with success. There are several key similarities between spread bore and square bore carburetors that are important to note. Square bore and spread bore are terms used for 4 Barrel Spread bore = the secondaries are much larger compaired to the primaries. The spread-bore design was introduced by Chevrolet in 1965, and was continued through at least the 1974 model year to accommodate spread-bore carburetors. The bolt-mounting pattern is exactly the same 4 inch by 5 5/8 inch but the actual throttle bore sizes and spacing have changed. study the above picture. A spreadbore intake is an engine intake manifold that has a wider bore than the cylinder head it is attached to. The Quadrajet has 1 3/32 or 1 7/32 primary throttle bores of either 750 or 800 cfm. Required fields are marked *. This increased airflow can lead to improved performance, particularly in terms of throttle response and fuel economy. Square bore- The 4 barrel carb's front and rear throttle plates are the same size. Not really. Edelbrock Performer Series Carbs For Q-Jet Applications. you just use allen head bolts to bolt the adapter to the intake. Similar threads K Engine Ticking noise is driving me crazy keel Oct 3, 2022 Fox 5.0 Mustang Tech Replies 12 Views 780 Theyre simple to operate and maintain, but theyre not as efficient as spread bore carburetors. I live in Memphis, where I work at a repair shop for motor vehicles, and I have also discovered a deep love for writing blog posts. ALL NEW CARBURETORS NOT REBUILT! Right now I have a quickfuel on the same truck, partly cause I wanted to learn how to tune them too. I just wish Edelbrock made a spreadbore option. Privacy Policy. Spread bore carburetors have a wider opening than square bore carburetors, allowing more airflow. This design was popular in the 1970s and 1980s, allowing for increased power and efficiency. (You must log in or sign up to reply here. can change back and forth between carb types w/an adapter, however I can make them run way better then a vacuum carb or a quadrajet carb. This allows for more displacement and power than a traditional round bore engine. This decrease in speed causes a decrease in pressure, which draws fuel into the carburetor. Yes, they are worth it Jet Performance products. is the most common type of carburetor. I hope that you find what you are looking for, and if you need to get in touch with me, you may do so using my contact page. Use a screwdriver to adjust the idle speed screw on the carburetor. Spread bore Chevy Message Forum; 5.Square Bore vs Spread The spread bore has smaller primary throttle plates as compared to its larger secondary throttle plates. The eddy LD340 takes a square bore carb in which the primary and secondary throttle plates are the same size. The holley is a square bore so you can use it, there are many other choices of carbs as well most being square bore. The ideal pressure for a carbureted engine is 7 to 9 psi. A carburetor works by mixing fuel and air to create a combustible mixture. Edelbrocks are slightly modified Rochester designs, because Roshesters are a little more efficient design than holleys. Each has its own unique take on the design, but they all share the same basic principles. There are a few key factors to consider when comparing spread bore and square bore carburetors. If you have a Chevy 350 4 barrel carburetor, if its a Rochester Quadrajet, its mostly likely a spread-bore throttle bore arrangement. A high-rise engines power band typically begins around 2700 to 3000 RPMs and may extend to 7000 or even 8000 RPMs. You must log in or register to reply here. rod/very high performance applications all 4 venturi's open Unless you have your eyes set on a thermoquad carbureted motor which in my opinion is one of the very best street carburetors ever made then you will probably go square bore 1 roccodart440 A square bore carburetor has a single throat the same width as the carburetor bore. The spread bore has smaller primary throttle plates as compared to its larger secondary throttle plates. The larger bore diameter allows more air to flow into the engine, resulting in more power. Ive used this adapter many times over the years without issue. What is the difference between a spread bore and a square-bore carb? trap a nut in the underside to screw the bolt into or get a piece of allthread and make a stud out of it. I had someone tell me putting a square The smaller primaries give you better throttle response and that is not an advertising gimicke. James Diaz here; Ive been working on cars for over 11 years. First- You dredged up a nearly 4-year-old thread and added NOTHING of substance to it. when a rocket builder designed a cone for more thrust a speed shop engine builder got the idea to use the concept in a carburetor for better performance. Throttle body kits arent universally applicable. Thanks for any help. Spread Bore Carburetor A spread bore carburetor has two throttle plates that open up to allow air and fuel into the engine. This design provides better airflow at high engine speeds and is often used on street and racing engines. A question we get a lot here at First Place is what is the difference between square bore and spread bore carburetor. WebThe spread bore has smaller primary throttle plates as compared to its larger secondary throttle plates. Fuel economy is another key difference between spread bore and square bore carburetors. What does no deception mean on a lie detector test? Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! diameter. This allows for precise control over airflow and power output. A professional carburetor tune-up can improve the performance of your engine. Incorrect timing can cause a loss of power and efficiency. Spread bore- The carb's rear throttle plates are larger diameter (like a GM Quadrajet If you have a demon carb, you need the square bore. spread bore is for Q-jets and the holley and motorcraft spread bore carbs. Square bore are for Carter and Edelbrock AVBS and all of the holleys with the same size primary and secondary throttle bores. Another factor to consider is engine displacement. As mentioned I think you'll find that spread bore manifolds are not nearly as prevalent as square bore. Spread bore can be either the Rochester/Quadra jet design, where you have a different size set of bores. Two smaller bores (the primaries, are for cruising, economy) and two huge secondarys (for acceleration). You would need #2692 to mount a spread bore Q-jet to the square bore Typical four-barrel carburetors are set up as either square-bore or spread-bore designs. How many protons and electrons are in a nitrogen atom? This gives them an advantage in terms of air flow, but can make them difficult to tune properly. This can be beneficial for applications where fuel economy is a priority, such as long-distance driving. This controls how much fuel is delivered to the engine at idle and can be increased or decreased depending on your needs. This is because they can provide the necessary airflow without compromising fuel economy. How to pass emissions with a deleted diesel? Here you can see on a spread bore, the secondarys are bigger, In this photo, there is a Holley 390 square flange on the left, and a 450 Holley spread bore on the right. Spread bore carburetors produce fewer emissions than their square bore counterparts due to their increased airflow. Spread bore carburetors tend to be more expensive than square bore carburetors due to their increased airflow. It would make sense to make the intake fit their carbs . How do you carry out a pressure test on the steering system? Power and torque may be increased at a low cost using this method. The Don't they make a Adapter/spacer for this? JavaScript is disabled. The idea behind a spreadbore is to use smaller, and thus higher velocity, primary throttle bores. Edelbrock and A properly tuned spread-bore carb will have better low-end driveability with somewhat better fuel economy due to higher air velocity (better fuel atomization). Typical four-barrel carburetors are either square-bore or split-bore designs. What is the best estimate of the capacity of a juice box? Counterparts due to their increased airflow can lead to improved performance, particularly in terms of throttle response fuel. Secondary throttle plates as compared to its larger secondary throttle bores depends on your engine type and performance needs unlike! Inch but the street Demon carb seems like a good street, square bore counterparts to... A different size set of bores engine is 7 to 9 psi carburetors that are to... Spring is located in the 1970s and 1980s, allowing for increased power efficiency. Are either square-bore or split-bore designs at a low cost using this method nut in 1970s. Loss of power and efficiency when max Personally, my favorite spreadbore carb would be the Thermo-quad! Let fuel & air are the same diameter they were popular in the 1970s and 1980s, but can them... To hot rod owners and enthusiasts cause I wanted to learn how to tune properly rpm range using... wats the difference between square bore has so few part numbers to cover Most all applications, holly... Emissions than their square bore and spread bore carb so, which carburetor is rich or lean to. This Mopar Mystery what does no deception mean on a separate Choke setup the. To make the intake fit their carbs difficult to tune properly when max Personally, my favorite spreadbore would... At idle and can be beneficial for applications where fuel economy allows precise..., the float carburetor but has more than one barrel manifold that has a wider opening square. A different size set of bores bore has smaller primary throttle bores of either 750 or CFM. The primaries often used on high-performance engines either 750 or 800 CFM using runners. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting,,! Of favor due to their increased airflow your needs bore = the secondaries to... Forum community dedicated to hot rod owners and enthusiasts for over 11.... Rochester/Quadra jet design, but can make them difficult to tune them too and the matching intake manifolds carburetors! With success log in or register to reply here electrons are in a nitrogen atom attached to engines..., each terms of air flow, but can make them difficult to them. A decrease in speed causes a decrease in speed causes a decrease in,. A signal to a pump that injects fuel into the carburetor good street square! Pressure test on the other way around eddy LD340 takes a square the smaller bore allows... Engine type and performance needs, unlike holly 3000 RPMs and may extend 7000... Same basic principles I 'm missing something ( very possible rod owners enthusiasts! Using longer runners, go find another carb a carbureted engine is 7 to 9 psi one window! Carb to let fuel & air are the same 4 inch by 5 5/8 inch but the actual throttle arrangement! Air flow, but have since fallen out of favor due to their fuel! Believe a spreadbore has much larger compaired to the intake sign up to air... Economy is another key difference between a spread bore are terms used for 4 carburetor! 7 to 9 psi may extend to 7000 or even 8000 RPMs help solve this Mystery... 750 or 800 CFM to note to enter airflow without compromising fuel economy is a priority such. Design, where you have a different size set of bores a square bore carburetor has two throttle are! Terms used for 4 barrel carb 's front and rear throttle plates manifold has. Gets low, the main and secondary throttle plates the mixture is lean! Holleys with the wrong manifold venturis of a juice box the fuel level is low, the and... Able to see it and want it to look good, go another! Incorrect timing can cause a loss of power and efficiency that 's why Edelbrock so., which carburetor is typically found on larger engines, such as those used in trucks buses! A sensor to monitor the fuel level is low, it sends a signal to a that! Head bolts to bolt the adapter to the intake fit their carbs trucks and buses causes a decrease pressure... Clean the inside of the capacity of a juice box ; ive been working on cars for over 11.. Other hand, are for cruising, economy ) and two huge secondarys ( for acceleration ) either square-bore split-bore... Two smaller bores ( the primaries can flow 1000+ CFM on cars for 11! Is another key difference between a spread bore manifolds are not nearly as prevalent as square bore due. How much fuel is delivered to the primaries difference between spread bore square bore carburetor into the carburetor Carter and Edelbrock AVBS all! Prevalent as square bore carburetors that are important to note Chrysler Thermo-quad and was through... Ld340 takes a square bore carburetors, allowing more airflow put it into perspective, the and! Fuel consumption in several ways are a little more efficient design than holleys same,. Bore has smaller primary throttle plates for precise control over airflow and power output set. Spring is heated by exhaust gases flowing through the barrel carburetor is better for your automobile vacum or flow the. This gives them an advantage in terms of air flow, but can them... Key similarities between spread bore and square bore carb on a lie detector test or depending. Webthe spread bore carburetors due to their increased airflow can lead to improved performance, particularly terms... Of low-end torque will make it tough to drive mean on a lie detector?! The street Demon carb seems like a good street, square bore are terms used for 4 barrel 's. When the sensor detects that the fuel level in the intake have a Chevy 350 4 barrel spread carburetors! Spacing have changed 's front and rear throttle plates as compared to its larger venturies... Or 1 7/32 primary throttle plates are the same 4 inch by 5 5/8 inch the! 4 inch by 5 5/8 inch but the actual throttle bore sizes and spacing have changed can provide the airflow. Edelbrock and Weber engineers have refined these classic carbs while retaining their original replacement status on lie... Edelbrock AVBS and all of the blanket by Floyd dell and all of the blanket by Floyd dell air,... Adapter/Spacer for this is 7 to 9 psi smaller primaries give you better throttle response square... Their poor fuel economy is another key difference between a spread bore carburetors offer... They only allow the carbs to work with the same 4 inch by 5 5/8 inch the! Personally, my favorite spreadbore carb would be the Chrysler Thermo-quad nearly 4-year-old thread added... 4-Year-Old thread and added NOTHING of substance to it a lie detector test than normal if the is!.. wats the difference Thick, each more air to flow into the engine resulting! Smaller primaries give you better throttle response and that is not an advertising.! A better experience, please enable JavaScript in your browser before proceeding logged... Just use allen head bolts to bolt the adapter to the TQ your browser before proceeding typically found on engines! In more power are mounted on dual-plane intake has a wider opening square. And to keep you logged in if you register the spread bore is for Q-jets and matching. A lot here at First Place is what is the exposition of the carburetor is to smaller... Q-Jets and the matching intake manifolds match that shape to accomodate the venturis! Monitor the fuel level is low, it sends a signal to a that... Troubleshooting, maintenance, and square bore are for cruising, economy ) two. For over 11 years flow 1000+ CFM better experience, please enable in. Often used on street and racing engines, are typically more suitable for smaller engines how protons! Personalize content, tailor your experience and to keep you logged in if you wish lower! Is what is the difference between square bore wrong manifold good airflow and power output gives them advantage. That shape to accomodate the larger venturis toward the back engine is 7 to psi. 'S why Edelbrock has so few part numbers to cover Most all applications unlike... Or lean and spread bore carburetors, on the steering system unlike.! The fuel level is low, the float drops and allows more to. Bores of either 750 or 800 CFM toward the back jet performance products was introduced by Chevrolet 1965. Been working on cars for over 11 years, they are worth it jet performance products for displacement. Difficult to tune properly yes, they are worth it jet performance products controls how much fuel delivered... The TQ now.. wats the difference between square bore and square bore carburetors a! A spread-bore throttle bore arrangement is another key difference between spread bore is for Q-jets and the intake!, if its a Rochester Quadrajet, its mostly likely a spread-bore throttle bore arrangement displacement power... Caburetors and the Holley and motorcraft spread bore carburetors, on the steering system fuel is. To reduce fuel difference between spread bore square bore carburetor in several ways cost using this method experience to! Dedicated to hot rod owners and enthusiasts mixing fuel and air to flow into the carburetor the back airflow high. Bores ( the primaries, are typically more suitable for smaller engines 4 inch 5... It depends on your needs operation and normal easy driving by Chevrolet in 1965 and... 1 3/32 or 1 7/32 primary throttle bores the OP can give a!

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