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dodge truck engine i need help here

J

JOCCO

Well-known Member
May be dealing with a 400 big block (1970's) Seems they had carb problems what was it and how do you fix or replace it? Also any other problems with the 400. Never really dealt with them much.
 
Can't remember the name of the carburetor on the trucks of that era......quadrajet? Is that what it's got on it? The absolutely best mechanic (not a technician) that I ever knew said they couldn't be fixed; replace with a Carter or Holley.
 
does it have a carter thermoquad on it? those can be hard to tune byu ought to work well when dialed in
 
Some had lean burn, just buy a vacuum advance ditributor, an orange ignition box and a 5 pin wiring harness.
 
never heard of Dodge making a 400. Chevy did in a small block, and the quadrajet carb was a GM carb. Chrysler typically had Carter. I heard rebuild kits for those old carbs are getting hard to come by and expensive.
 
Some of the bigger Mopar engines of that time had plastic bodied 4 barrel carbs on them and they had a tendency to start on fire.
 
400 came out in 73 -74 ? basicly stroked 383 big block. Most 2 bbl carb were holley's . 4bbl's were Carter Thermoquads or Holley 4bbls .The tq's had plastic fuel bowls. They did warp some . The biggest failure was main well caps on bottom of bowl. Clean up and epoxy back on ,fixed em right up . Dodge did use Rochester Quadrjets in mid 80's ,on both cars and trucks . Great carbs !
 
You seem to be up on them what is the best option to replace one with?? Rebuilding is a fate worse than death so i am told?
 
The Thermo Quads were not a fire problem it was the layed back factory curb timing and if ya just bumped it up just a lousy 5 degrees then no pop back thru the carbs . The layed back timing started in 68 and i do not care what Mopar engine it was they would all pop back and have carb fires . You do not know how many Road Runners and Cudas and GTX's i had to replace engine compartment wiring carbs and alt., dist. form pop backs Set the automatic cars a 7.5 degrees and the sticks at 10 BTDC and they would start like a ford and no carb fires.
 
Depending on the carb that was on yours and that i need to know to try and help ya as i was a Chrysler Plymouth master tech and a Chrysler Plymouth parts manager for a good number of years back then . Yea i am and old fart.
 
The Dodge/Chrysler 400 is basically a bored 383. It uses the 440 bore size and the 383 stroke length. If it is the plastic FANTASTIC carb, I understand it had many issue once it had some age on it. Find someone who knows the carb. I never turned a wrench on one of those carbs. I mainly messed with Hilbron constant flow injection on my OLD Early Hemi's.
Also some 400 were built with the "Lean Burn" system on them. If it is one of them, you can tell by the electronics in the air filter if you still have the stock air filter housing, your best bet would be to change the entire induction and ignition system to earlier parts to get the engine to run right.

Kent
 
As a General Motors Technician for 20 years and a racing nut, the Quadrajet was the best and easiest carb to use and rebuild. Just not everyone could build it.
 
Some people called it a "QuadraJUNK," but I always had pretty good luck working with Q-Jets. Just had to remember to replace the [junk] phenolic float with a brass one, back when you could still get 'em.
 
Dodge had the 400.
I couldn"t tell you exactly what years, but it was in the 70s at least.
 
Depends what you have on there now , and what you are using it for . I own a carb shop and rebuilding was never a problem , more of an improvement as I saw it . Give me a call if you like during the day 319-329-0915
 
Call me [ 607-760-4771 ]I have had several of these in Dodge Trucks/Stil have around 50 Dodge Truck here on the Farm.60's-90's/100's-800's models.
 
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