holley vs rochester Discussion in 'Mechanic's Corner' started by cme2die, Aug 1, 2010. . So in order to put the squarebore on the stock manifold I need an adapter. The 4500 was designed to be a race carburetor, they can flow in the 1000 + cfm range, more than most 2X4 or 3x2 multi- carburetor set-ups from the . 02-04-2021, 03:26 PM #2. Jump to Latest . someone already mentioned the holley spread bores didnt work very well. Holley Spreadbore and Quadrajet - Holley Spread bore 10-23-03 04:40 PM - Post# 323583 In response to TheBandit The Q' Jet is a spread bore. Holley Spread Bore Vs Quadrajet. The spread bore carbs have the centers in a trapazoid shape. The best carb that is a Holley Spread Bore is the Q-Jet replacement for the Pontiac 455, double pumper, dual feed bowls, 800 cfm's. Carter Rochester 4 Carter Rochester 4 Barrel To Holley Carburetor Adapter With Mounting Hardware. Sticking Float Quadrajet [TW6FOC] If you have a later Q-jet just drill the hole where the idle screw goes to .095 and go from there. Buy in monthly payments with Affirm on orders over $50. What exactly is the performance difference with the spreadbores and are. Bore Quadrajet Spread Holley Vs [IOC57M] 5 sometimes 12. Edelbrock prides themselves in ensuring all products are shipped as quickly as possible. The first bolt on spread bore electronic fuel injected t. Carb Carburetor Selection Quadrajet Square Bore Dominator Choke Manual Electric Street Strip Spread 4500 4150 Edelbrock Flange 4 barrel 2 Secondaries Vacuum Mechanical Race. Once upon a time I knew how to adjust the choke and fast idle cam on a 1969 Rochester Quadrajet, with divorced choke but 30 years have left me foggy. 9. Holley spread bore vs quadrajet x 1.700/4.400 in. I'm thinking about swapping the quadrajet for a edelbrock 1406 which is a square bore carb. Quadrajet is my vote, they are very tuff and have a higher tolerance to trash and varnish from what I have seen. Designed as a bolt-on replacement for GM's venerable Quadrajet, Holley's 4175 carburetors utilize a front-mounted fuel bowl fitting, allowing you to reuse the stock fuel line. The Quadrajet became an instant success. All of the carbs I have ever ran have been square bore. Is there a difference and are there any safety issues?. Re: Square bore Carb VS. In all, 5 cfm (cubic feet per minute) . In addition to all of these great tried and true features, the Sniper EFI . and economical. I have a 4150 Holley on my 64 350 TH 350 Chevy II. As to tuning, the major disadvantage of any of the spread-bores (Carter TQ and Rochester Q-Jet) is the difficulty in acquiring tuning parts compared to finding parts for Holleys. I wouldn't look at anything less than a 850 cfm on either the quad jet or the Holley spread bore, that's what the factory put on them. Holley vs Quadrajet, Every vette owner has their perference. Part Number: AED-6155 Not Yet Reviewed The later models with the 4175 spread bore Holley show the gasket with the 4 holes in the OMC catalogs I've seen. It includes an electric choke along with a 3/4" 4-hole spacer, throttle lever adapter . Spread Bore. Also required stock manifold and anti polution hoses etc. Many aftermarket intake manifolds have a dual pattern flange. Factory intake manifolds consist of two basic types—Holley square base and spread bore for Rochester Quadrajet and Holley Spread Bore. SHARE POST #12. Square bore vs. Quadrajet (spread bore)? I told you the Holley was a square-bore. These two carbs require different bolt patterns, although many manifolds are designed to fit both. Re: Rochester Quadrajet to Edlebrock 1410 Conversion? The spread bore Holley is a nice blend of both small primaries, big secondaries, either vacuum or mechanical controlled secondaries, and a huge selection of. Holley Spread Bore Vs Quadrajet. bolt pattern on quad vs Holley 03-20-2007, 08:47 AM Will a holley bolt on to a ford 429 quadrajet intake with just the 3/8 spacer or is the ford quadrajet the same bolt pattern as the chevy and require the big adapter for a holley square flange to a spreadbore intake? About Bore Quadrajet Holley Spread Vs . Use a Q-jet. Aside from the obvious (square-bore vs spread-bore, built-in pressure regulator has vs external, etc.) Insulating Spread Bore Base Gasket 4 Hole design, (Thickness: .250" ) Quantity: 1 gasket Replaces Rochester OEM gasket # 1248516. That means it will mount either a spread bore or square bore carb. Holley offers various options to replace your square-bore (Quadrajet) carburetor for a Holley spread-bore carburetor. Sometimes even if your carburetor and manifold have the same bore shape, the manifold flange isn't large enough so an adapter is still recommended. chev. I ran a Quadrajet on my 68 327 4 speed Camaro. 1972 Nova - 454 LS7 - ATI Turbo 400 - Moser 3. Is there any performance difference between an open type spacer adapter vs a 4 hole adapter. Holley 450 CFM Economizer 4 Barrel Spreadbore Carburetor. Now streaming live: 39. but each motor is different. I know that spreadbore is what came on chevys but I am in search for a 650-750DP Holley and have came across a few cheaper ones that happened to be spread bore. Mark Ehlen Author . I personally am a big fan of the Edelbrock carbs. And it is recommended for later model passenger car and truck applications because the later computerized vehicles have more emissions components help to manage their fuel systems and this tends to add to the operating temperature in the engine . I told you the Holley was a square-bore. carb gasket 1/16″ thick. The smaller primary bores give the carburetor better idling and low-load fuel economy. This new carburetor was blended with what Rochester knew about carburetors, mixed with ideas from other manufacturers, (spread-bore design and vacuum secondaries). Having said that, you will have a few issues and modifications when switching over. It's a chevy 350 in a 4x4 truck. (1) Mounts square-bore carbs (5-5/32 x 5-5/8 inch) to spread-bore ( 4-1/4 x 5-5/8 inch) carb pad on Edelbrock intakes (not needed for #2101 . Throttle Bore Diameter Primary Throttle Bore Diameter Secondary R1848-1 4160; 465 37-119: 37-933 6-506: 122-57 N/S: N/S 34R9716-3: 125-85 0.025: Green 108-83-2: 108-89-2 108-90-2: 108-90-2 108-27-2: N/A 134-105: N/S 1-3/32: 1-3/32 1-1/2: 1-1/2 R1849 I've been trawling both the Holley product pages and this forum to get some information on this, but I'm not getting anywhere so hoping someone can help. Holley made several spread bore carbs in various cfm and secondary styles. This carb is a direct bolt on (except for linkage and air cleaner stud length) to the manifold. Thick, Open, Spread Bore, Each. A spread bore (smaller primarys) is typically better for gas mileage if you can keep your foot out of it. 2" x 3-¼" and a bore size of 1-7/16". The spread bore has smaller primary throttle plates as compared to its larger secondary throttle plates. You need to drain the gas and take apart a Holley to change jets, and you will probably do that several times before you get the best tune. Holley 20-44 Throttle Cable Bracket For Use Wholley Models 4165. The AFB is shaped far differently from a traditional Holley 4150/4160 carburetor, and the mounting pattern can be different, but modern Edelbrock variants are produced with two bolt patterns and will fit on most square-bore manifolds (as compared to the spread-bore variety used with a Rochester Quadrajet). Part Number: JET-35002. I use a Holley 4150 650cfm electric choke vac. Holley made a replacement carb for that. and you dont need a . With a Q-jet, they lift out the top, and you can replace just the rods. Edelbrock offers a quick and painless return process on all new and unused products. . Obviously yours has had the PV removed in the secondaries. Open Carburetor Adapter 1" Holley/AFB 4-bbl to Quadrajet $114.99. There's 2 pieces epoxied to the bottom of the plastic body that come loose and then the fuel will seep out of the bowls and into the intake. They will not get the economy of a Qjet and that's . Spread bores have some theoretical advantages, but largely equalized by properly tuned vacuum secondary holley types. Quadrajet -----scratcher (02-03-2002 09:52): Hi Lep; If you remember where we left off on my Tripp it was a discussion of the Holley vs the Qjet from my old motor. The holley was a smogger stock replacement that didnt work as well as stock. Carburetor Height is the distance from the base plate to the top of the carb, where the air cleaner sits. QuadraJet vs Standard with Adapter. Once upon a time I knew how to adjust the choke and fast idle cam on a 1969 Rochester Quadrajet, with divorced choke but 30 years have left me foggy. TQ and Q-Jet parts ARE available mail-order; but not in every single parts house in the nation like the Holleys (is it possible Holleys NEED that many parts? Not fast enough to cause driveability or flooding but enough to go dry over night. You asked about performance though so on that note.. I'll defer back to it's what you know how to tune. Larry Reply Quote Rochester Qjet vs. Holley spreadbore (8/12) About Spread Vs Bore Quadrajet Holley . i'm not sure why you're so set on a spread bore carb. Read Here To See Our Product Review Of The Best barrel holley spread bore carb universal Products November 24, 2021 by allen We are committed to providing you with the best barrel holley spread bore carb universal products, focusing on their unbiased reviews, reliable buying guides, and unique models. Holley 4175 Carburetors. That square bore was a little faster over all but it sure didn't kick you in the pants like that spread bore when you dumped it. Carb Adapter #2696 Square-Bore Carb to Stock QuadraJet & Thermo-Quad 0.85 in. About Spread Holley Quadrajet Vs Bore . Save $15 Off $299, $25 Off $499, $50 Off $799, $100 Off $1,599 Orders . I have a rebuilt quadrajet and would like to use it. . Introduced in 1965, the Quadrajet is the only four-barrel carburetor that performed well during the 1960s, through tighter emissions in the 1970s, The aftermarket brings you a wealth of dual- and single-plane intake manifolds depending upon what you want the engine to do. 20-06-2009, 12:08 AM. Adapters allow a carb with one flange style to bolt to an intake with a different style flange. Is there a difference and are there any safety issues?. I'm trying to find out what the functional differences between the standard Sniper 550-511K and the QuadraJet variant are. Re:Re:Holley vrs. I have found that the idle circuits of the spread bores to be far more troublesome than any Q-jet. its simple. Re: Rochester Quadrajet to Edlebrock 1410 Conversion? Holley 6210-3 650 CFM spread bore double pumper Q-jet replacement carb core GM. what are . Hi All. A carburetor can be either Square-Bore or Spread Bore.An intake manifold can also be either Square-Bore or Spread Bore.All you have to do is match the carburetor flange to the manifold flange. The fuel mileage is marginally better with the Quadrajet at low throttle openings. Carburetor Adapter for 4150 Square-Bore to Stock Quadrajet & Thermo-Quad Spread-Bore Manifold . Hello, I have been doing some testing on the Holley 450 Speadbore carb and thought I would share my experience. The Edelbrock Performer is a high rise 180 degree spread bore manifold. you can get a spread bore/ square bore adapter. series, some engines loved them and an "identical" engine didn't. Some spread bore Holleys would work well and the next one was a punk. I've run the 4165 and 4011 and did not care for either. It's similar to a Quadrajet having the bowl plugs leak. The 4165s were either 650 or 800 cfm double pumpers, the 4175 was a 650 vacuum secondary and the 4011's were either 650 or 800 cfm in either dp or vs configuration. The 1407 Edelbrock carb is based on an AFB style Carter (square bore). The Quadrajet was actually the successor to the previously-built Rochester 4GC carburetor that was manufactured from 1952 to 1967. Holley Spread Bore Vs Quadrajet. for simplicty the 600-650 holley would be easier to tune with jets on primary and vacume secondary plate holley would be 66 I ran a 350 on 59!!! 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 best out of the box Qj beat the out of the box Holley by 2 m. Holley Carb Dies When Put In Gear. Aug 2 . The EPS is optimized specifically for their square-bore carburetors and has somewhat better torque and horsepower numbers than the Performer which is for both square- and spread-bore carbs. Holley Spreadbore and Quadrajet Thanks to the dual pattern design of the squarebore Sniper EFI systems, you have tons of options even if you're using the less popular spreadbore or Quadrajet style intake manifolds. Carburetor Adapters. QJ has easier parts availability and "tuning" parts (jets, metering rods, metering rod pistons, etc) are easy to come by and it's a lot less complicated a carb. Thermoquad vs Quadrajet. Holley - 4160 series "Spread-bore" 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. Re:Re:Holley vrs. Holley Spread Bore 4164 4175 Quadrajet Carburetor Rebuild Renew Kit Auto Marine. This Edelbrock Q-Jet carburetor features all-metal construction for no leaks and no hassles. One guy can tune a holley and likes them. The Thermoquad's can have the nasty habit of the fuel bowls draining. 1/4" thick gasket helps insulate carburetor from intake manifold heat and raises the carburetor to increase plenum volume. We dyno test spread-bore fueling on a 1968 Olds 4-4-2 with a rebuilt Rochester Quadra-Jet versus a Holley Sniper EFI. View Details. The QuadraJet is a . Holley 0-80555C Holley model 4175 carburetor Holley spread bore carb carbs Quadrajet replacement carburetor Quadrajet replacement carb carbs. There are square bores with a small primary/large secondary but the bore centers form a square. PicClick Insights - Carb Carburetor Adapter 4bbl Quadrajet For Holley AFB Demon Carter Edelbrock AU PicClick Exclusive Popularity - 1,440 views, 2. Spreadbores and are circuits of the carbs i have been doing some testing the! Original air cleaner stud length ) to the manifold the Sniper EFI having said,... 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