best carb size for a 350
#1
best carb size for a 350
what carb would be best for a 350 rocket it has an intake and headers soon to be a mild cam
my edelbrock 1406 died im looking at a 500 cfm edelbrock 1403
its my daily and gets 14 mpg in town 23 on the highway ( 72 d88 ht 2dr th400 3.08 gears) with the 600
my edelbrock 1406 died im looking at a 500 cfm edelbrock 1403
its my daily and gets 14 mpg in town 23 on the highway ( 72 d88 ht 2dr th400 3.08 gears) with the 600
#3
#4
A stock Q-jet should get better mileage because of the smaller primaries, and better performance because of the larger secondaries than an E-brock. Also the smaller primaries give quicker throttle response.
#5
i respectfully have to say i'm not a fan of q jets . my edelbrock has been good to me the best i got with the ebrock was 18 in town and that was not leadfooting it
#13
#14
I have a 1406 edelbrock carb I took off my car. I removed the electric choke, but you could just use the one you have on your car, swap it over and use it.
It's not worth a whole lot to me, and if you're looking to keep the same carb, it could be a relatively cheap option for you.
It's not worth a whole lot to me, and if you're looking to keep the same carb, it could be a relatively cheap option for you.
#15
If you are looking for the best mpg and power you can't do better than a q-jet until you go efi.. and even then you'd have to go multi port .
but if you like your edel rebuild it.. or is that the reason you're not a fan of the q-jet.. you don't know how a carb works , nor how to rebuild one..?
No shame in that, everyone has to learn some how,time.
get a rebuild kit for your edel. and have at it..
#17
https://www.summitracing.com/parts/sum-m08600vs
I run the 750cfm version of this on my 55 gasser with a 427 BBC that spins to 6500RPM, is very streetable and performs flawlessly at the track
Two of my buddies run the 600cfm version on 350 SBC street machines and prefer them over other carbs they've used.
It's an older Holley design that Summit bought and perfected. They operate flawlessly right out of the box and can be tuned with standard Holley Jets and Power Valves etc.
I currently have an Edelbrock on the Cutlass that I don't much care for so I'll eventually get a Sean Murphy Q-Jet for it to keep it original.
I've previously used Holley 4150's, Street Avengers, 3310's etc and none of them compare to the Summit carb
I run the 750cfm version of this on my 55 gasser with a 427 BBC that spins to 6500RPM, is very streetable and performs flawlessly at the track
Two of my buddies run the 600cfm version on 350 SBC street machines and prefer them over other carbs they've used.
It's an older Holley design that Summit bought and perfected. They operate flawlessly right out of the box and can be tuned with standard Holley Jets and Power Valves etc.
I currently have an Edelbrock on the Cutlass that I don't much care for so I'll eventually get a Sean Murphy Q-Jet for it to keep it original.
I've previously used Holley 4150's, Street Avengers, 3310's etc and none of them compare to the Summit carb
#18
I'm mostly a Q-Jet guy, but I had a great experience with a 670 CFM Holley Street Avenger on a 327/350 Chevy. Very crisp, ran great right out of the box, but still very tuneable. A 570 CFM might be good for your application.
#19
mightyleadfoot
i understand how a carb works i had a q jet on a 305 sbc in my t/a and it was worthless
im getting 19 in town 28 highway with a th400 and 331 gears next step is efi
olds 350 a great engine when you cant find a 455
#21
#22
#23
#24
A true mechanical secondary carb will open the secondaries no matter if there is a vacuum signal or not. A Qjet is NOT a true mechanical secondary carb, sorry.
#25
I would just get the new avs 2 edelbrock 600cfm, super easy to tune and now better than ever, those summit carbs get great reviews as well, I have a street demon 625, pretty good as well. Get a AFM and any carb will be good, its all abut the tune. The original question, stick with 500-800 cfm, lol
#27
I’ve never seen a Holley vacuum secondary carb with any type of throttle blade above the ones in the base plate, when the lack vacuum gets to a certain point the vacuum servo opens the throttle blades. On a quadrajet if you open the the primary cycling through to full throttle the secondary’s start opening( idk 3/4 way in) and continue to open to full throttle by the time the primaries do. If that’s not mechanical let secondary idk what is. The “doors” above the secondary’s are basically meters to adjust secondary fuelling based off airflow.
#28
I’ve never seen a Holley vacuum secondary carb with any type of throttle blade above the ones in the base plate, when the lack vacuum gets to a certain point the vacuum servo opens the throttle blades. On a quadrajet if you open the the primary cycling through to full throttle the secondary’s start opening( idk 3/4 way in) and continue to open to full throttle by the time the primaries do. If that’s not mechanical let secondary idk what is. The “doors” above the secondary’s are basically meters to adjust secondary fuelling based off airflow.
Edelbrock carbs also have lower and upper secondary plates.
Bottom line, on any vacuum secondary carb, including Qjets, fuel metering doesn't start until the VACUUM operated doors open. On a true mechanical secondary, fuel metering starts the second the mechanically operated plates/secondarys are opened. A Qjet is a vacuum secondary.
#29
Edelbrock carbs also have lower and upper secondary plates.
Bottom line, on any vacuum secondary carb, including Qjets, fuel metering doesn't start until the VACUUM operated doors open. On a true mechanical secondary, fuel metering starts the second the mechanically operated plates/secondarys are opened. A Qjet is a vacuum secondary.
Bottom line, on any vacuum secondary carb, including Qjets, fuel metering doesn't start until the VACUUM operated doors open. On a true mechanical secondary, fuel metering starts the second the mechanically operated plates/secondarys are opened. A Qjet is a vacuum secondary.
#30
I’m not making any claims about when fuel metering starts but quadrajet do not use vacuum to open any part of the secondary throttle. Holleys actually have a vacuum servo to control the opening of the secondary throttle. But none of this helps the op so we can just agree to disagree?
#31
I’m not making any claims about when fuel metering starts but quadrajet do not use vacuum to open any part of the secondary throttle. Holleys actually have a vacuum servo to control the opening of the secondary throttle. But none of this helps the op so we can just agree to disagree?
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