4bbl woes
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Elder User
Joined: Sep 2005
Posts: 647
Likes: 3
From: Brumley, MO
4bbl woes
Well guys my 4bbl fantasy land is over. After having so much trouble with these various quadrajet carbs I have decided to downgrade to MC 2bbl from a big motor(probably 390 FE). My 300 has a lot of miles on it, and even though it runs good it is getting tired, and of the cylinders is a little weak. I have decided that the right quadrajet would be awesome if tuned correctly on a fresh, or built 300, but not the best for a tired old stock 300.
I don't have a small 4bbl carb, I sure can't find one in my area on craigslist, and I really can't afford much right now. So I guess I am going with a MC 2bbl, because they are cheap, and awesome, hopefully it won't have any bog like the Q-Jet so it will seem smoother, and run better.
One of these days when(IF!) the truck is fixed up nice I might spend the money for a rebuild, and find myself a real good Q-Jet with a good choke on it, but until then I hope I am not too disapointed with a 2100 or 2150.
I don't have a small 4bbl carb, I sure can't find one in my area on craigslist, and I really can't afford much right now. So I guess I am going with a MC 2bbl, because they are cheap, and awesome, hopefully it won't have any bog like the Q-Jet so it will seem smoother, and run better.
One of these days when(IF!) the truck is fixed up nice I might spend the money for a rebuild, and find myself a real good Q-Jet with a good choke on it, but until then I hope I am not too disapointed with a 2100 or 2150.
Senior User
Joined: Jul 2009
Posts: 343
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From: Northwest
I put an Edelbrock #1403 with electric choke on my 300 with a offenhauser dual plane intake, it's a 500 cfm carb and I have a fresh rebuild on the 300 six but I have no issue at all, I have no bog problems and other than the exhaust smelling a little rich, it starts, Idles and runs excellent. I would highly recommend the Edelbrock #1403 carb.
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Elder User
Joined: Sep 2005
Posts: 647
Likes: 3
From: Brumley, MO
I think a 500 Edelbrock wouldn't be to bad, but I can't be sure of that, and I can't find them cheap locally(craigslist). The only thing that is selling cheap around here are 600-1000 CFM carbs that will be worse than the Q-Jet. If my motor was more fresh I think a Q-Jet would be fine, but my motor has a lot of miles it has probably had a hard life(goose neck was in the bed at one time), and it just really shouldn't have that much carb at this point(without a rebuild). That is why I am going with the 2bbl(carb only I will still use the 4bbl intake), because I know that it will run decent(maybe better than the Q-Jet), and be plenty reliable for my old war dog.
Postmaster
Joined: Mar 2005
Posts: 2,949
Likes: 6
From: Earth
FWIW, the 500 and 600 Edelbrock carbs are the same other than the jets/rods and maybe the pump squirter. Go download the Edlebrock Performer carb tuning manual and check the specs - same venturi sizes.
That said, unless the engine is modded I think most 4-barrels run rich for a 300. I'm actually rebuilding a 2100 carb now to replace the Edelbrock 500 on my Offy C manifold until I can have a new, pepped up engine built.
That said, unless the engine is modded I think most 4-barrels run rich for a 300. I'm actually rebuilding a 2100 carb now to replace the Edelbrock 500 on my Offy C manifold until I can have a new, pepped up engine built.
Tuned
Joined: Nov 2009
Posts: 407
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From: Rochester
Hey dwrestle
I had a Q-jet on my truck when I first put my offy dp intake and efi manifiolds on and did the duraspark converstion and I could never get the thing to run right!! I messed around with it for weeks! It was a new factory reman Q-jet. Would not for the life of me run right. Would Idle good. Horrible bogs. Go to stop and it would almost die and then surge and it was a pain. Bought a Edelbrock 1403 put it on ran like a charm! Been running it for almost a year now and haven't done anything beside mess with the rods and jets and getting around 14city and 16-17 highway. Compared to 8-9 all around when I had the 1bbl and Q-jet. Im not knocking the Q-jet but the Eldelbrock 1403 500cfm and 1405 600cfm are basically the same just different rods/jets spring/squirter setups I believe. If you can find one of those and put it on I think you would be more than happy with it compared to the Q-jet.
I had a Q-jet on my truck when I first put my offy dp intake and efi manifiolds on and did the duraspark converstion and I could never get the thing to run right!! I messed around with it for weeks! It was a new factory reman Q-jet. Would not for the life of me run right. Would Idle good. Horrible bogs. Go to stop and it would almost die and then surge and it was a pain. Bought a Edelbrock 1403 put it on ran like a charm! Been running it for almost a year now and haven't done anything beside mess with the rods and jets and getting around 14city and 16-17 highway. Compared to 8-9 all around when I had the 1bbl and Q-jet. Im not knocking the Q-jet but the Eldelbrock 1403 500cfm and 1405 600cfm are basically the same just different rods/jets spring/squirter setups I believe. If you can find one of those and put it on I think you would be more than happy with it compared to the Q-jet.
Post Fiend
Joined: Dec 2007
Posts: 8,521
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From: Lost
I don't have any experience with running an edelbrock on a 300 I6 (yet), but I do have a 1405 600CFM on one of my RX7's. That carb, straight outta the box, works perfectly on the 1.3L (80cid) rotary in all but 1 minor way. Since it mounts with a 90* rotation (like the I6 with the offy DP) it suffers from a stumble exiting a high G-load turn. Otherwise, it totally mops the floor with the holley 600 I have also tried on the same engine. "Normal" driving/cornering does not have this stumble issue, and the stumble is only during hard right hand corners. I have done everything edelbrock's tech help has suggested, and will be trying it out this weekend (sanctioned motorsport event). If the stumble returns, the holley will go on for now. I plan to swap to a holley 650DP regardless, in the near future.
The overall plan, is to install an offy DP on my 300, and top it with the 1405 that I already own. The 1405 has only remained on the rotary due to not having yet aquired/made all the pieces (fuel line and throttle cable bracket) needed to install the 650DP sitting on the shelf....
I doubt the truck is even capable of reaching the G-load cornering that appears to be the wrinkle in the edelbrock's otherwise shiny armor.....
The overall plan, is to install an offy DP on my 300, and top it with the 1405 that I already own. The 1405 has only remained on the rotary due to not having yet aquired/made all the pieces (fuel line and throttle cable bracket) needed to install the 650DP sitting on the shelf....
I doubt the truck is even capable of reaching the G-load cornering that appears to be the wrinkle in the edelbrock's otherwise shiny armor.....
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