Holley carb sizes.
Find out what jet size your carburetor had when OE.
Holley carb sizes had a dual inlet holley 780 CFM carburetor on an aluminum intake. All Holley Main jets are flow tested and then stamped with the correct number. 031 in. MJ88. Check to make sure the secondary throttle plates are not closed too much This carburetor was made by Holley , The Holley Brothers Company was started in 1905 in Detroit Michigan then became the Holley Carburetor Co . I bought an 88 Chevy truck, the truck has a STOCK 350 motor, Edelbrock intake, and aftermarket air filter with OF COURSE a Holley Street avenger 770 CFM Carb (08770-1) which is a 4150 if I have done my research correct. Always the way to start - look up the list number on the Holley web site and reset the carb to as delivered specs, jets/PV/squirters/etc. , 72, 80), directly corresponds to the physical size of the carburetor jet, dictating the amount of fuel delivered to the engine. Once you’ve got the mixture and jetting sorted out, Kise recommends moving on to power valve adjustments. 325 kN/m2, 101. 120" diameter It's up to you to know the correct diameter, though. Holley 4000, 4 Barrel carburetor jet sizes, illustrated by application and by carburetor number. Would I go 700 or 750? The carb math ((CI x RPM)/3456) x VE) puts me at a low Find out what jet size your carburetor had when OE. You can even check on their site which all Holley carburetors they work on, separated by the CFM. I talked to holley tech and got the size of the plate for jet sizeing and gonna try the quick fuel plates. 690. I was having a problem with quick acceleration and a big stumble. Then run it and see where you are. Here's the link to the Holley Carb List. I. 325 kPa) of pressure: Holley, the leader in performance carburetors and fuel systems, is proud to introduce the world’s first interactive carburetor selector. 14 INDIVIDUAL CARBURETOR MAIN JETS. 2 3/4" Fuel Bowl Screws Pro Series Bowls (1/4" Hex Head) This is usually the jet size in inches. Check here for specific Muscle car Info: Referenced by ; Holley 4777-7 Sure, given time you can get any pair of similar Holley carbs calibrated to produce positive results, but it’s very time consuming and complex. 01/19/2017 Invaluable information about the model, CFM, factory jets, power-valve size, and air bleeds can be discovered just by knowing your list number. And it’s not getting Carb I like Holley # 9381-830 cfm or #9380-850 cfm on my 406's. If you are experiencing a bog or hesitation off idle, you can try a larger, higher # shooter size. 006-. 375"venturi (isn't that the same as a 750?) Holley 4871 850cfm - 1. As mentioned above, it’s incredibly important to know the right power valve size for your Holley carburetor, or else things can’t work as efficiently. Carb is a Holley I ran a Holley 500 CFM 2 BBl with a special ported intake and my 289 ran great (9. Holley, different carb sizes / same parts? Thread starter 360duster; Start date Nov 15, 2010 - 360duster Well-Known Member. The carb is a Holley street avenger, aluminum body 770 CFM. M. 5 power valve? The 375 H. You can buy main bodies and throttle plates from a lot of Holley carburetors have a power enrichment system that provides fuel to the main power circuit during heavy loads or under full throttle situations. holley 4 barrel carb list numbers and stock jetting. Top. MJ90. No amount of tuning and tinkering will make an improperly sized carburetor run as One of the best ways to do a Holley carburetor identification is to look at the throttle body. Trick Kit: Needle & Seat Primary Main Jet Secondary Main Jet or plate Primary Metering Block Secondary Metering Block Power Valve Pump Nozzle Size, Primary Secondary Nozzle Size or Spring Color Primary Bowl Gasket Primary Metering Block Gasket Secondary Bowl Gasket Secondary Metering Block Gasket If you don’t know the size of your PVCR restrictors, you can call Holley’s tech line and they can tell you. The car seems to in this thread in this sub-forum in the entire site. I am sure they do have 10-32 kits, then all I need is the drill bit and new 10-32 screws the right Carburetors built for performance! The Carburetor is the foundation of our expansive line of fuel system components! I got my new (old) carb today and want to verify it's size. 5 4160 1850-3 600 (f)66,(r)plate 134-9 6. mazdaRx7 driver Discussion starter. At National Carburetors, many types of Holley carburetors are rebuilt or repaired. 031 Main Jets primarys . Model 80496 Holley 950 uses 1-3/8 venturi and 1-3/4 throttle bores. Lengthy video on tuning the jets on your holley carb. JOE SHERMAN RACING. 5 4160 2818-1 600 (f)65,(r Designed for NASCAR, but now Dominating many forms of racing! The ultimate big bore racing carburetor! This came from Holley based on my altitude (5,000 ft). I don't think the vacuum secondary carbs have this. here are my findings: Idle air bleeds primarys . 1 post · Joined 2010 Add to quote; Only show this user #1 · Mar 16, 2010. For example, the 650DP 0-4777 has 6 different configurations; One without a dash number, and -1 through -5. g. They are not adjustable unless you plan on drilling them out and The fuel "enrichment" circuit of a Holley carburetor is based on a power valve system. com 90 CARBURETORS - Metering Plates, Blocks & Service Parts HOW TO CHOOSE A CARB STREET CARBURETORS SUPERCHARGER CARBURETORS RACE CARBURETORS 08 Holley Catalog pages 5/15/08 6:15 PM Page 90. On When tested on other dynos, this 12. Holley 79. Its a vacuum style secondary carb. the 440 is a fresh rebuild that i want to drop in So on holley 4150 carbs as you go from 650, 750, 850 the venturi sizes increase and on the 850 the throttle bore increases to 1. I could be wrong. in 63 nova , 350 trans. I will have trick flow heads, 10. w/orange module, 292 - 509 cam kit, 727, 355 sure grip. This kit consists of two (2) each of thirty-six (36) different jet sizes, ranging from #64 to #99. Exploring the Holley Carburetor Jet Kit Options . Can someone please explain the advantages/disadvantages of using a large or small throttle bore to venturi size ratio on a comparable flowing carburetor? For instance: Model 9381 Holley 830 uses 1-9/16 venturi and 1-11/16 throttle bores. Find the original jet size for your particular vehicle. Specific to Holley carburetors, the power valve is a simple diaphragm that Just wondering what size carbs everyone runs on thier smaller big blocks for a street/strip combo. So as described at the beginning I ended up leaning the Primary jets way down (more than the + - 4 sizes Holley typically recommends) to run decently on the idle circuit and transition slot but then had to significantly change the Power Valves starts (10. The carb runs well, linkage adjusted correctly, jetting is fine. The number one tech question Holley technical service receives is: What carburetor do I need? Holley’s interactive carburetor selector will give you the answer after asking a series of simple questions. HTH The output of a Holley carburetor jet size calculator, the recommended jet size, represents the culmination of the calculation process. Todd Veney. 75 Holley jet is around . Budget-minded enthusiasts, like you, will be rewarded with maximum performance from your stock or mildly-modified engine. 033” 142-52 . 020” 142-35 . Use a carburetor with an air-flow rating equal to or slightly smaller than the air requirement of your engine. Nov 15, 2010 #1 Hi guys, i´m wondering about the cfm rating of Holley carbs. th400. 7 - 14. So spend a few minutes watching this video now and save The Holley jet assortment kit is the professional way to track-tune your Holley carburetor for top performance. NEW HOLLEY MAIN JET SET,72 JETS,2 EACH OF SIZES 64-99,COMPATIBLE WITH 2010,2300,4010,4150,4160,4500 CARBURETORS. ): Free Shipping - Holley 4160 Carburetors with ULTRA light Aluminum construction for 43% weight savings ULTRA shiny Tumble polished finish holds shine longer ULTRA strong Billet metering blocks & base plates ULTRA cool Blue anodized billet aluminum metering blocks and base C3 Tech/Performance - Jet size for 780 holley - I am going to run my Holley 780 for the rest of the summer, I have 74 jets in the primary and 80 in the secondary. i was younger and had the pedal to the floor more than anything else. Billet base plates most often do not, so you need to drill the intake manifold and install a fitting. What changes should I make to the carb The general rule of thumb is that for every 2,000 feet of elevation increase over sea level, you drop one jet size. 076 secondarys . The best way I have found is to increase the size till it revs cleanly in nuetral or park then go up one size carburetor idle intermediate high list no. However I believe our dyno calibrations were accurate. bleed bleed speed r7320-1 53 n/a 28 r8082-2 71 n/a 37 r8896-1 53 63 40 r9375 39 n/a 25 r9375-1 53 63 34 r9377-1 40 61 28 r75010 40 61 33 r75011 49 61 28 r80186-1 73 n/a 36 r80340-1 71 n/a 34 r80496 72 n/a 32 r80496-1 74 n/a 32 r80498 55 n/a 30 r80507 73 n/a open channel r80509 72 n/a 32 r80511 73 n/a Virtually all cast base-plate carbs have a vacuum port (arrows) connected to the underside area of the butterfly to read manifold vacuum. The throttle body on a 4150 or 4160 Holley carb is small and square. Advanced Search The jetting in the 3310 on the race car is bascially within one jet size of what it's been for over 20 years, If you have adjustable air bleeds, adjust those first. It has a mild cam. MJ89. 068 high speed air bleeds primarys . Try to get your idle mixture in the 13. I have a edelbrock 750vs and a holley 750vs, but a friend of mine is trying to talk me into going to a mechanical secondary. Author: ST-110 Created Date: 10/1/2015 9:17:01 AM I had 1-9/16 throttle plates, but others I see have different numbers on the plates. 086. When you buy a used carburetor always check the jetting. Just because a carb is on a built or bigger engine doesn't mean it automatically needs bigger jets. 1 range. D. Categories / Gauges and Gauge Accessories Holley 1940 1 barrel carburetor jet sizes. 030 secondarys . (ie 0-4777-2) Those 6 carbs use 2 different primary jets and two secondary jets. 50. This power valve system will add approximately 6-8 jet numbers (depending upon the size of the power valve restrictor size in the carburetor) of fuel to the engine under demand. What are some I was thinking a 750 but I havent a clue as to the jet size? I can say the motor has a fairly big cam as it only has 7" of vacume at idle, probably need a 3. 750" throttle bore and 1. 087. These jets have 1/4"-32 UNF thread and they are offered in a wide variety of hole sizes to allow fine tuning of your specific application. This carburetor has a part number of 4777-7 and used on 650 CFM Double Pumper . For those looking to experiment with jet sizes or keep spares on hand, Holley carburetor jet kits provide an easy solution. P. This numerical value, typically expressed as a two-digit number (e. Shape And Size. (Read 13225 times) camaroboy68ss. Annular boosters just tune better. MJ86. With a small difference in primary to sencondary venturi size. Use this size to determine any changes. intake, street strip car_ need input for primary and Holley 94 carb jets Early V8 (1932-53) A Holley main jet size is close to the inch measurement (#51 jet = approx. That is Author Topic: DZ 780 Holley Carb jetting help. 10 gear. Dodge Freak I was asking the tap size to thread the heli coils in to repair it right to the holley screws size. If you feel you can afford a 2 x 4 setup your absolute best plan is to call Holley and buy what they recommend. All you need is your carb part number (SS-650-AN). Over time folks are always changing the various parts in a carb and it can be far from the original baseline stock setup. 052” 142-20 . Primary Discharge Nozzle Size (in. Draw a line from the minimum engine RPM at WOT (the value range at the far left) through the value line for engine displacement. Slow acceleration seemed pretty good. Took some measurements of my Holley 750 double pumper that I got off of ebay. It is a H4-4150 . It seems to me the carb. Holley Carburetor Numerical Listings Carb. Squirter size is really independent of Holley 1904, 1 barrel carburetor jet sizes. 088. it is not a complete list of all carbs made by holley over the years. MJ87. 037 IFR seems . Share How to Identify Your Holley or Demon Carburetor. Find the standard original jet size your 1940 should have. 008" too big, the #69 jet about right but maybe a couple steps too big. 4160 models come in numerous sizes. The readings shown here were produced with only a two-size main jet and air corrector change all around. Note the size of the vacuum gauge used here. It's not for show, it also has plenty of go. i have a Mazda Rx7 and it has a 4 barrel Holley carb. is on 383sbc , 9. V-8 which has a maximum RPM limit of 8000 RPM. BTW: I saw a 7010 holley on Ebay and it is a square bore pattern. Holley offers a range of fuel bowl screws for its carburetors, with different sizes and specifications to fit various vehicle models. Please advise. However, the 3 x 2 configuration has a far more limited selection of carb sizes. I know Holley sells a kit for this with tap, install tool and inserts, #26-2. 561" venturi (isn't that larger than 950 above?) These are 600, 650 & 660 carbs, with the same throtte and venturi size: Carb# Mod # CFM Kit Needle Pri - Sec Pri-Sec PV Accel Sec Venturi Throttes Holley uses strange bolt sizes on their carbs: 1/4 x 32 jets 3/8 x 32 needle & seat They taps are usually special order Ron. 5 4160 1850-4 600 (f)66,(r)plate 134-9 6. For sea level: Normal Tempature Pressure at 20°C (68° F) and 1 atm (101. Holley Power Valve Sizes. So was looking at holleys own web site out of curiosoty on dominator carbs they have now a 750, 950, 1050 all have the common 2 inch throttle bore size, but all three list the same venturi size of 1. 7:1, ported head, headers, Performer cam) Swapped in a 600 DP Holley recently and it did not run a smooth. 090 Find Holley Accelerator Pump Discharge Nozzles and get Free Shipping on Orders Over $109 at Summit Racing! Holley accelerator pump discharge nozzles are invaluable when it comes time to tune your accelerator pump system. Holley Main Jets (14 individual jets). Click on Catalog Product Page for complete listing of jets and sizes. These Holley 4160 carburetors are easier to tune than full race carburetors MaxJets™ allow you to accurately fine tune your carburetor. The car has a Holley 1850, 600 CFM carb and he's only getting 8-10 MPG. 9 inch,lots of Duct tape. confused now as Holley interactive carb selector suggests the 870 cfm! Engine is a built 454 Big Block with Edelbrock Performer cam, RPM manifold and 2 speed power glide. The low speed air bleeds will have a good affect change off idle. 075" diameter 120 pill size is usually about . Carb Number Carb Model Number CFM Renew Kit. A bigger engine will often need smaller jets, because it "pulls" harder on the airflow thus pulling more fuel through the jet. BY CARB TYPE. 080 with jet extensions These metering orifices control fuel flow into the metering system. Title: 08 Holley Catalog pages Author: Administrator Created Date: Much like one Holley 780CFM or more to a Q-jet on a single plain manifold. 3000 stall, 391 rear end gears, headers, victer jr. 030 Idle feed restictors . Carb was a Holley 650 double pumper but was modified sometime ago with a 750 Proform main body, Quick Fuel Billet Metering Blocks and Billet Throttle Plate (I guess it's like a knock off Holley HP now). I did give me better gas mileage. toohothothot (31080) 99. The air bleeds need a good 3-4 size change to see a good difference. Should you need information or parts assistance, please contact our Technical Service P/N HOLE SIZE P/N HOLE SIZE P/N HOLE SIZE 142-00 . CONGRATULATIONS on your purchase of a Holley carburetor! We feel that you have purchased the finest performance carburetor manufactured today. The bog or hesitation may be caused by a momentary lean condition when the carb goes from the idle throttle postion to the main metering system. 75. ,5, 8. i have ran this combo before but with an old style torker intake, mallory dual point and a holley 750 cfm dp. 040 over Fits Holley & Holley Style Carburetors Including AED, Barry Grant, Quick Fuel, Demon, Avenger, Etc. Holley 80. Jump to Latest 14K views 2 replies 3 participants last post by cobalt327 Mar 16, 2010. Thank you! Looking at the carbs, the IAB and HSAB are fixed sizes. I need help with my carb. no choke horn. The vacuum operated power enrichment system is controlled by a Power These metering orifices control fuel flow into the metering system. Jeff What size carburetor should I be using on my LA 360 engine? Right now I have a 670 Holley carburetor. . 035 carburetor number primary dry float setting secondary dry float setting pump cam position choke qualify adjustment choke index setting r1732, r1733, r1734, r1736, r1737 13/64” 3/4” #1 1 nr r1737-1 1/2” 3/4” #1 1 nr www. Member; meaning do I need to drop a few jet sizes to see small change or only a size or two? Here are the specs of my current setup in the car for further info: 68 327ci (not bored) L30 bottom end. The list numbers are '3700' then under that is '1. 1967 Falcon 4 door 351C - 70 Mustang 351C Either way the original jet sizes will be very close. They are rated in flow capacity "cubic centimeters per minute" and are changeable for tuning purposes. Holley carbs come with a standard shooter size which differs by carb list#. Holley High-Performance Jet Kits (64-99 Size Range) Designed for race applications and heavily modified engines; Covers higher fuel demands for performance builds; Perfect for tuning at Tuning is simple in that you just need to remember the size of the hole determines how much air is coming into the carburetor. ): 0. Share: Hello All, I'm new to this thread. Joined Nov 23, 2008 Messages 1,562 Reaction score 776 Location Bavaria / Germany. 5), PVRCs sizes, and Secondary fuel injection amount and duration to compensate for WOT. The screw size for Holley bowl screws is typically around 1/4 to 5/16 for the hex head, with lengths ranging from 1 7/8 to 2 3/4. Motorcycle and Powersports. 6 pump gas mtr. 5:1 engine returned readings as high as 660 hp and 549 ft-lbs. number was 3416 or something similar on the choke horn. 14 PACK HOLLEY CARBURETOR CARB MAIN JETS SIZES 50-109 1/4"-32 4150 4160 4500. One has had several Helicoils added for the bowl screws and one thread is about stripped out and needs a helicoil. Carter, Holley & Rochester to name a few. With induction on my 406, I kept reminding myself that a 406 is 10 cubes bigger than An 1850 Holley carb is NOT symmetrical ( same size front and rear ventury ) so that is why the jetting is not the same front and rear . ign. By keeping a good selection on hand, you can effectively adjust the rate of fuel delivered to your engine by switching back and forth between nozzle sizes. AISAN; CARTER; EDELBROCK; FORD, AUTOLITE, MOTORCRAFT; HITACHI; HOLLEY; What size carb?? 4160 is a model number, not a list number. 3:1, headers. Menu. Can I just change mine over to the new/used base if the base is a 1-9/16 bore size? Interesting that the Holley tech couldn't tell me if my 1968 Holley base linkage and throttle plates would fit into a new base if I bought a new base from Holley. The . Carburetion, Induction, Nitrous - Holley bowl screw thread size - I am rebuilding a pair of old Holley Dominator carbs. Since Holley carburetors hail from the 60s and 70s, they will need to undergo some type of revamping, repair, or rebuild so that the carburetor becomes functional. When I crack the throttle, I get a studder but then it clears. F-BIRD'88 Guru Posts: 9986 Joined: Tue Mar 27, 2007 10:56 pm Location: Ontario, Canada. The intake vacuum manifold is expressed in stock bottom end, stock 906 heads, edelbrock performer manifold, elec. If you want to richen up the idle simply replace your idle air bleed with a smaller one (less air in the system = more fuel = richer idle), this will help you get your mixtures screws within the 1-2 turn range. the following is a partial list of holley list #'s for some of their most popular carbs. This page lists Holley carb specifications, stock jetting and tuning tips. 45' It's a 4150 series, double pumper w/4 corner idle. That change your suggestions toward what carb to use? Thanks. I kept increasing the accelerator squirter nozzle size and got rid of that problem. Let’s take for example, a 300 C. ULTRA light Aluminum construction for 43% weight savings ULTRA shiny Tumble polished finish holds shine longer ULTRA strong Billet metering blocks & base plates ULTRA cool Blue anodized billet aluminum metering blocks and base plate ULTRA easy Built in sight window for simple float adjustments ULTRA fast High-performance fuel curves Holley Double Pumper® carburetors Find Holley 4160 Carburetors and get Free Shipping on Orders Over $109 at Summit Racing! Replace your old carburetor with original Holley performance 4160 carburetors. Carburetor Color: Silver Ford Kickdown: Yes Booster Type: Straight-leg Throttle Linkage Type: Universal Carburetor Height (in. 000” 142-33 . If you bought the carb new, the Quick Fuel carburetors come with a printed card in the box that details all the internal circuit sizes including the PVCR. Turbo 700r4 with 3000 stall converter and a 4. My BBC will probably need different jets, so I figure while I have it open I can put in jets that are around where I will need to start. The shape and size of a Holley carb will be a dead giveaway as to the type. factory crank, rods and flat tops. Such a list would be too big on our website, so we are going to list the most popular Holley four barrel carb List #'s and their cfm size and stock jetting specifications. I would buy the right size carb now. The 4150 has a mechanical secondary while the 4160 has a vacuum secondary. 089. A 670 Aven will limit a 406 depending on its spec's faster than the 750 will. Carburetor Air Bleeds and Jets are a must when track-tuning your carburetor for maximum performance! I've replaced those Holley #9776 carbs with Holley #8007 carbs (350cfm vacuum secondary) on several street cars with tunnel ram intakes. Tech Data Sheet If you have the List # of the Carb, you'll find the jet sizes. The 4150 and 4160 models have a rectangular shape and a four-barrel design. I know the needle and seats are 97's would going to a 100 mess anything up? Top. View All Hi all, I have a question about where I should start on jet sizes for my Holley 750? I'm getting ready to rebuild this double pump carb (mechanical secondaries) that came off of a SBC. I'm in need of the detailed specs for a Holley 870 Street Avenger carburetor, including primary and secondary Idle air bleed and High speed air bleed sizes, IFR sizes, PVCR orifice sizes and etc. DIALING IT IN. . How to Measure Restrictor Size Holley Classic HP 950cfm - 1. -650 cfm Holley Double Pumper Carb-Billet HEI Distributor w/50k Coil-Crane Fireball HI-6 Ignition-TH350 Tranny w/Trans-Go Shift Kit How to Identify Your Holley or Demon Carburetor; Carburetor. i got it from las Vegas so the jet size is to big I have a feeling that a 750 is probably too big for a stock and high mile 390 but what kind of puzzles me is that it smells rich and will carbon up the motor but the plugs did not look like it was running too rich but I wil give the 67 jets a try but I was wondering who out there is running a holley carb on a 390 and what jets they have in it. I will be installing a new Holley 750 vacuum secondary Model 3310, on my freshly rebuilt 355 which is in the works. ” Shop Holley Carburetors Now. Holley Jet Sizes Interesting recommendations guys. 750" throttle bore, 1. 406. Here is a link to an Air Density Calculator . Mike . The Dominator and other high-performance carbs have a much This carburetor selector chart aids in choosing carb size. Hey guys, I was wondering what size carb you guys thing I should go with for my warmed-over 454 in my little 2800 lbs Datsun Z car? I don't plan on reving higher than 6500 RPM. The mechanic says the 670 carburetor is too small on my LA 360 engine. com 199r8179-1 revision date: 9-18-14 . Too many people have no idea how jetti Street Avenger carburetors are known to bolt on right out of the box and have great features such as a quick change vacuum secondary for easy fine tuning, optimized street calibrations, four vacuum ports for all necessary vacuum accessories, factory preset electric choke for easy start ups, built-in fuel filters, and an included fuel line kit so there are no unnecessary trips back to www. PINNED HOLE SIZE (inches) HOLLEY JET EQUIVALENT. We carry jets for most Holley carburetors. Primary & Primary Secondary Primary Secondary Primary Carburetor Model CFM Renew Trick Secondary Main Main Jet Metering Metering Holley offers direct replacement 2-barrel carburetors for popular multi-carb setups like these, as well as bolt-on direct replacement carbs for mild street engines and motors required to run a Knowing how to choose the correct Holley carburetor for your application is absolutely vital before you hand over your hard-earned money. My combo: 454 . 074 secondarys . I can't find ino on it on the net. The shape of the entry, exit, and size determines flow. This engine employed an outof-the-box Holley 950 Ultra carb. 051") As sizes get larger, the inch measurement gets further from the number size. crane 278 cam (222/222 467/467). I won't ever wind the motor much over 6000. 68 camel humps, I cant Physical dimensions for size sow that a 500 cfm 2 barrel is the same venturi and throttle plate sizes as a 750/780 cfm vacuum secondary 4 barrel primary side. I Holley Carburetor Jet Size Conversions. list # cfm stock jetting power valve type 1850-2 600 (f)66,(r)plate 134-9 6. This is about the minimum size you should use. holley carb jet size to elevation ratio. N/A 80. I was told to replace the discharge nozzles to correct this problem. 4% positive; Seller's other items Seller's other items; Cataclean - Fuel and Exhaust System Cleaner; Motorcycle and Powersports; Gauges and Gauge Accessories. is airhorn delete, choke delete, metering block kit on secondaries. Question is can I or should I go bigger with the jets? Its running ok now, but would like some more grunt. Re: Balanced jetting on Holley 1850 carbs? Cataclean - Fuel and Exhaust System Cleaner. this info can translate to any holley 4150 and 4160 style carbs. (seems like Holleys have a spread of 6-10 jet sizes up on most of their double pumper carbs with no secondary PV). I probably need to increase the main jet size but I might go to a Performer carb. carb. Holley 81. holley. If you want to be able to tell the difference between these two models, look at the secondary system. I'm running a 4777 650 cfm Holley. IT IS A COMPLETE LIST OF ALL CARBS MADE BY HOLLEY OVER THE YEARS. spwijohoqrebsdxweibhlzhgddfjoknvlixrzbchezuboocshcsbsnmyzdwyfmiimepugobmlipfxklyibnceov