Moparchat - Home of MOPAR enthusiasts worldwide!



Go Back   Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance Talk

Click here to search for Mopar cars and parts for sale.


Reply
 
Thread Tools Display Modes
  #1  
Old 09-23-2003, 10:33 PM
powerplant powerplant is offline
Inactive User
 
Join Date: Sep 2003
Location: Southeast MN
Posts: 35
Default Carb and intake questions

I have a 1969 rr with a 383 "B" low deck engine. It has been recently rebuilt and I am not sure if they did any boreing of the cylinders or not, let say it is .030 over for all practical purposes. Besides that the only mods are Headman headers and electronic Ignition and a open air cleaner. I run a stock 4 speed behind the engine. It currently has the iron 4bbl intake with a 625 cfm Carter (edelbrock look alike or visa versa) carb.

What is the best dual plane aluminum 4bbl intake to buy?

What cfm carb would work best?

What brand / type of carb would you buy / and or stay away from?

Will doing any of this give me more hp without doing anything else to the engine?
Reply With Quote
  #2  
Old 09-23-2003, 10:41 PM
66 Dartman's Avatar
66 Dartman 66 Dartman is offline
Inactive User
 
Join Date: Sep 2002
Location: Linwood, PA
Age: 54
Posts: 244
Default

If you have a stock cam in it, you should stick with a Performer Intake or a Weiand Stealth(heard lots of good stuff about that).

You may want to go up to a 650-700 CFM. I personally like Carter carbs (especially the AVS) for the street. There are a lot of people hear who are better able to point you in the right direction as far as a carb is concerned though. Just don't try and go too big on the carb with a stock cam.

An intake swap from the iron one will give you a pretty decent increase. maybe 25-30 HP.
Reply With Quote
  #3  
Old 09-23-2003, 10:52 PM
d.friction's Avatar
d.friction d.friction is offline
Inactive User
 
Join Date: Jun 2003
Location: Austin/Texas
Posts: 281
Default

A new intake will do some good I like Weiand's Action+Plus. Depending on what all you have in the motor i.e. if it is more or less stock stay with a low rise duel plain intake vs. a high rise dual plain like the Stealth. Edelbrock also makes a good intake, the performer (low) and the performer RPM (high). Stay away from single plane intakes.
As for the carb you are going to get a mixed bag of replies. Some people hear love TQ's some love Carter style and some Holleys. All have their pros and con. Find a crab that you are comfortable with on your combo they will probably all work about the same. If you can spare the bucks I love BG carbs.
As for air flow(cfm) your cam, heads, comp., and how the car is to be use will have alot to do with the cfm. I would say 650 to on the big side 750 should be fine. Vac. sec is the way I would go for the street although you have a 4 speed.
Before you get a carb see how the intake does with you old carb first.
Reply With Quote
  #4  
Old 09-23-2003, 10:53 PM
23T's Avatar
23T 23T is offline
Inactive User
 
Join Date: Oct 2002
Location: Lubbock, Texas
Age: 77
Posts: 973
Default

My 0.02 stay away from the Eddy carbs unless you can buy them in bulk
Reply With Quote
  #5  
Old 09-24-2003, 01:05 AM
ehostler's Avatar
ehostler ehostler is offline
Registered User
 
Join Date: Jan 2000
Location: Annandale, VA
Age: 57
Posts: 15,212
Default

A Demon carb is only about $10 more than a Holley of the same size.

As you have a manual, you don't want a vac secondary.

If you like spread bores, you can't go wrong with a ThermoQuad. These things are simply amazing.
Reply With Quote
  #6  
Old 09-24-2003, 09:44 AM
71383bee's Avatar
71383bee 71383bee is offline
Inactive User
 
Join Date: Mar 2001
Location: Milwaukee, WI
Age: 48
Posts: 654
Post

First thing is what are you planning on doing with the car. Is this a street/strip mod? Are you willing to pull the motor and upgrade the pistons, cam, etc? Do you have a quarter mile range you are interested in?

Please don't say I want to beat mustangs and get 20 miles to the gallon! I really hate that response. All in all you need to set some goals for the car.

If you had a basically stock rebuild then you have a good package to start with. You can accomplish a lot with just bolt on mods. The 383 Super Bee and Roadrunner 383 is an extremely good package. I would go with a more radical cam and a good dual plane intake. I would suggest the Performer RPM over everything else. The plane perfrormer is basically the same as a stock 4BBl intake which is aluminum. Not much gains there. The RPM is a cross between a single plain and a dual plane. It covers all RPM limits from low end torque to peak horespower. Tests were showing the RPM belting out peak hp numbers similar to single plains and it had the added benefit of delivering low end torque for the street. For a big block street/strip intake this thing is tough to beat.

For cam I'll step aside and let everyone else tell you about Racer Brown, then Hughes, then Ultradyne, then Engle...etc...I whisper Comp Cams will also grind Mopar specific cams if you ask them, but don't tell anyone that...LOL Seriously, I have a comp cams cam in my 383 and I do like the way it runs. It probably would run a bit better on a custom grind, but I wasn't as knowledgable back then.

Talk to cuda66273 about carbs...he'll have you dreaming about shiny demons in no time.

The only thing limiting you is your compression and your heads. They are probably 906's which are good heads that can flow well with a bit of work. And that is a whole different supject.
Reply With Quote
  #7  
Old 09-24-2003, 04:05 PM
cuda66273's Avatar
cuda66273 cuda66273 is offline
Banned
 
Join Date: Dec 2001
Location: Beaverton Oregon
Age: 71
Posts: 3,685
Default

Yup a 650 Speed Demon with mechanical secondary's would be the ticket, bolt it on and hang on!

Catalog and sales policy
http://www.4secondsflat.com/fuelsystems.html

Tuning help
http://www.4secondsflat.com/demon101.html

Some good reading:
http://www.4secondsflat.com/Ignition.html

More reading for the John:
http://www.4secondsflat.com/Mission%20Ignition.html

Now were getting deep.....
http://www.4secondsflat.com/Cam_Tech.html

Anyhow have a look around and you'll get a better understanding of how alll this stuff works together.
Reply With Quote
  #8  
Old 10-03-2003, 07:20 PM
powerplant powerplant is offline
Inactive User
 
Join Date: Sep 2003
Location: Southeast MN
Posts: 35
Laugh

I want to beat Mustangs and get 20 miles to the gallon!
Reply With Quote
  #9  
Old 10-03-2003, 07:20 PM
powerplant powerplant is offline
Inactive User
 
Join Date: Sep 2003
Location: Southeast MN
Posts: 35
Laugh

I want to beat Mustangs and get 20 miles to the gallon!
Reply With Quote
  #10  
Old 10-03-2003, 07:29 PM
powerplant powerplant is offline
Inactive User
 
Join Date: Sep 2003
Location: Southeast MN
Posts: 35
Default

Dang, I hit the post button before I was done.

I ment to say I was just kidding in the last post.



For all to know, I just bought a mechanical secondary 650 speed demon double pumper (new). I went ahead and got the electric choke option and cheeped out and got the mr. gasket fuel line instead of the $$$ demon line.

I have been layed up all summer with a torn achilies tendon and have not been able to drive it. Been doing a lot of mods and restoring. Just finished the new headliner, fixed the leaking heater core and non-operational control cables, and so on and so fourth, you guys know how it is.

Just wanted to get rid of the carb, I suspect that fuel is leaking out of the bowls and causing a hard start (takes a lot of cranking when it has sat for along time).

Thanks for the help, sounds like the performer RPM is the manafold I want.

Are there any clearance issues I need to worry about to keep the stock hood?
Reply With Quote
  #11  
Old 10-06-2003, 09:28 AM
71383bee's Avatar
71383bee 71383bee is offline
Inactive User
 
Join Date: Mar 2001
Location: Milwaukee, WI
Age: 48
Posts: 654
Post

I have seen RPM intakes on 383's in 1st generation roadrunners that fit without mods to the hood so I don't think you will have a problem. You may need a drop base air cleaner. Take some clay and place it on the air cleaner and shut the hood. Open the hood and measure how thick the clay is. Use this as a guide for clearance. If your not using stock style bisciut (sp) mounts you may have issues though.
Reply With Quote
  #12  
Old 10-07-2003, 12:30 AM
71RR's Avatar
71RR 71RR is offline
Inactive User
 
Join Date: Aug 2003
Location: Columbus,OH
Age: 48
Posts: 343
Default

I would go with the Edelbrock Performer RPM Intake manifold and 750 Holley Double Pumper. A drop base open element breather with a K&N filter would be great as well. And if you can part with another $60+ get the K&N X-stream air cleaner lid.
Yes it will give you more power without any other mods.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
carb questions 53 dodge Performance Talk 12 01-14-2008 02:31 PM
Carb and Intake questions John's Duster Performance Talk 16 07-12-2004 08:18 PM
carb questions BillyMafia Performance Talk 13 01-06-2004 09:58 AM
Carb questions Mr.Sixpack Performance Talk 0 09-30-2003 01:50 PM
340 intake carb questions 318Fred Performance Talk 4 01-01-2001 07:46 PM




All times are GMT -4. The time now is 01:49 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
. . . . .