Experienced advice requested ref carb selection
Thread Starter
Staging Lane
Joined: Apr 2012
Posts: 94
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Experienced advice requested ref carb selection I was hoping to pick the brains of the experienced carb guys here.
I am almost done with a sbc to 5.3 swap down here in South Florida.
I am keeping my old Holley for the sbc. I need to purchase a new carb for the 5.3 setup on my Chevelle. The car is running a th400 3500 stall to some tall gears. 224 cam .581 lift 112 Lsa, PAC 1218 springs, Edelbrock dual plane, 6ls. Stock bottom. Mid headers.fresh valve job on my truck heads, milled flat minimally, stock height head gaskets. Car will be mostly street weekend driver, track under 6 times a year. Any educated suggestions on brand, size and configuration would be very much appreciated. Cost is not the main issue. I want reliability and power.
I have looked at the quick fuel slayer 750, the Summit 4150 kits, and a number of Holleys. I don't know any better. Please advise any suggested directions to go here. Mec, vac, 650,750, adjustability etc. Any of my Ls experienced buds are all running fi. These heads clearly flow Better than any sbc I have played with so my guesses are likely to be no good.
I am almost done with a sbc to 5.3 swap down here in South Florida.
I am keeping my old Holley for the sbc. I need to purchase a new carb for the 5.3 setup on my Chevelle. The car is running a th400 3500 stall to some tall gears. 224 cam .581 lift 112 Lsa, PAC 1218 springs, Edelbrock dual plane, 6ls. Stock bottom. Mid headers.fresh valve job on my truck heads, milled flat minimally, stock height head gaskets. Car will be mostly street weekend driver, track under 6 times a year. Any educated suggestions on brand, size and configuration would be very much appreciated. Cost is not the main issue. I want reliability and power.
I have looked at the quick fuel slayer 750, the Summit 4150 kits, and a number of Holleys. I don't know any better. Please advise any suggested directions to go here. Mec, vac, 650,750, adjustability etc. Any of my Ls experienced buds are all running fi. These heads clearly flow Better than any sbc I have played with so my guesses are likely to be no good.
Last edited by likes cars; Sep 12, 2012 at 07:21 PM.
Quick fuel makes some damn nice stuff. their slayer series is sort of like a a 4160 Holley in that they have a metering plate with no jets in the secondary. I would at least upgrade to their HR series to get secondary jets. A better option with even more tunability is the SS stuff. If I were in the market for another carb that would unquestionably the the one I would get.
I think most guys on here would recommend something in the 650 cfm range for a 5.3, especially with your set up.
If you do go Holley their street avengers and HP carbs supposedly work on LS motors pretty much right out of the box. Classic double pumpers might need a little more tuning but work just fine once you get them where they need to be.
What ever you do consider investing in a wideband O2 or at least borrowing one. Pretty hard to get the tune right otherwise.
I think most guys on here would recommend something in the 650 cfm range for a 5.3, especially with your set up.
If you do go Holley their street avengers and HP carbs supposedly work on LS motors pretty much right out of the box. Classic double pumpers might need a little more tuning but work just fine once you get them where they need to be.
What ever you do consider investing in a wideband O2 or at least borrowing one. Pretty hard to get the tune right otherwise.
A 650 mechanical or a 750 vac sec. The 650 will be snappy and get more air when the WOT and better to tune, but if you wanted to use a bit larger, a VS 750 will do fine and still throw more air in with the secondaries and RPM.
Don't run a vacuum secondary carburetor with a 3500 stall. Any stall 3000 or larger is mechanical secondary territory. With that cam and stall I say go with a 750 cfm. If you want cold weather drivability, get one with a choke. I like the quick fuel products.
You will need to calibrate the power valve restictor orifice and possiby the idle bleed and feed retrictor for a good clean cruise air fuel ratio so just plan on buying a good wideband set up.
You will need to calibrate the power valve restictor orifice and possiby the idle bleed and feed retrictor for a good clean cruise air fuel ratio so just plan on buying a good wideband set up.
Last edited by speedtigger; Sep 13, 2012 at 04:52 PM.
Thread Starter
Staging Lane
Joined: Apr 2012
Posts: 94
Likes: 0
It is funny how when you put together a car you need to look at the whole thing front to back. Part by part just screws things so badly. Carb, stall, cam, gears etc.
This issue has taken me beyond the advice of just the carb and opened my eyes up to the rear gearing and terribly insufficient 10 bolt in my car. Thanks for the responses. I am getting a wideband and a mech sec Quick Fuel. Oh yeah, and a new 12 bolt. Now I'm looking at brakes. It never end$.
This issue has taken me beyond the advice of just the carb and opened my eyes up to the rear gearing and terribly insufficient 10 bolt in my car. Thanks for the responses. I am getting a wideband and a mech sec Quick Fuel. Oh yeah, and a new 12 bolt. Now I'm looking at brakes. It never end$.
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It is funny how when you put together a car you need to look at the whole thing front to back. Part by part just screws things so badly. Carb, stall, cam, gears etc.
This issue has taken me beyond the advice of just the carb and opened my eyes up to the rear gearing and terribly insufficient 10 bolt in my car. Thanks for the responses. I am getting a wideband and a mech sec Quick Fuel. Oh yeah, and a new 12 bolt. Now I'm looking at brakes. It never end$.
This issue has taken me beyond the advice of just the carb and opened my eyes up to the rear gearing and terribly insufficient 10 bolt in my car. Thanks for the responses. I am getting a wideband and a mech sec Quick Fuel. Oh yeah, and a new 12 bolt. Now I'm looking at brakes. It never end$.
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Thread Starter
Staging Lane
Joined: Apr 2012
Posts: 94
Likes: 0
Guys thanks for the help. This is a learning experience and the assistance is very much appreciated.
I almost bought this today http://www.summitracing.com/parts/QFT-Q-750/?rtype=10 , but the Summit rep, Brunner x6985 was very helpful and mentioned this http://www.summitracing.com/parts/AED-750HO/ as a cheaper alternative with similar features.
Anybody have any luck with AED? For $125 dollars difference all I see is flash. Is the QF really better?
PRO Systems in Jax, FL is around $640 for a custom built deal.
I almost bought this today http://www.summitracing.com/parts/QFT-Q-750/?rtype=10 , but the Summit rep, Brunner x6985 was very helpful and mentioned this http://www.summitracing.com/parts/AED-750HO/ as a cheaper alternative with similar features.
Anybody have any luck with AED? For $125 dollars difference all I see is flash. Is the QF really better?
PRO Systems in Jax, FL is around $640 for a custom built deal.
Last edited by likes cars; Sep 17, 2012 at 04:04 PM.
Thread Starter
Staging Lane
Joined: Apr 2012
Posts: 94
Likes: 0
By the way, regarding the rear. In order to put proper gears and axles in my 10 bolt I am going to spend about $1500 in parts and labor.
Today I got a quote from Summit for a Strange S60 at $2100 delivered.
I am also looking very hard at A 9 inch Ford bolt in for the Chevelle in a light configuration for around $1600 or the HD version at around $1950. Either way my brakes will work with the gm ends. I was pleasantly surprised at the price options. I am leaning Ford because of simplicity in gearing options down the road.
Today I got a quote from Summit for a Strange S60 at $2100 delivered.
I am also looking very hard at A 9 inch Ford bolt in for the Chevelle in a light configuration for around $1600 or the HD version at around $1950. Either way my brakes will work with the gm ends. I was pleasantly surprised at the price options. I am leaning Ford because of simplicity in gearing options down the road.
Not sure what to tell you on the AED. They are suppose to have a lot of features. Might be a good deal.
QF baseplates have some nice features, like a secondary idle adjustment screw that is accessible from the top, stainless throttle plate, improved throttle shaft seals and the option to put in progressive linkage. Plus that QF model has tunable air bleeds and idle feed restrictors. If the AED has all that then might be a good deal. There are a number of other little things, like huge float level sight windows and the ability to plumb in fuel from either side of the carb.
I will tell you which one looks better.
QF baseplates have some nice features, like a secondary idle adjustment screw that is accessible from the top, stainless throttle plate, improved throttle shaft seals and the option to put in progressive linkage. Plus that QF model has tunable air bleeds and idle feed restrictors. If the AED has all that then might be a good deal. There are a number of other little things, like huge float level sight windows and the ability to plumb in fuel from either side of the carb.
I will tell you which one looks better.
