Wife wanted a burnout! Now the car is sick ( the cough kind, not the cool kind)!!!

[Derwud]

Backfires scare me.. since you are running a AVS/AFB style carb, not much to go wrong from a backfire.. I lost a timing chain to a back fire on a 318 once.. Start with the basics, timing, secondary ign parts, vacuum leaks, over fueling from stuck float or needle and seat..

 

[moparcrazy]

sounds like the carburetor, pull the front and rear float bowl adjusters and clean them with brake or carb cleaner, readjust the bowl's

 

[Ranger16]

I'm leaning towards the valve train camp.

 

[moper]

I've bent 4-5 pushrods over the years. They can be funky. sometimes they miss at idle, other instances it idles fine but pops, some instances it has a total miss everywhere.

 

[gtxno1]

before you dissassemble take out a vacuum guage that is your best friend you will know quickly if you have a vale train issue missle may be correct

 

[Dennis H]

My 440 had a couple bent rods and all they did was make noise. No performance aspect.
When you get it figured out, let us know. We will have you check everything from the bumpers, to the dome light, to the Dana and everything in between. I had more problems with throttle linkage, and the routing. 2 rturn springs etc.

 

[wsutard]

I'm starting with the easy to check stuff.

Distributor is solid and new
Wires are solid to the cap
Cap is solid
Coil wire is solid
Plug wires aren't touching heat
Plug wires are solid to plugs
Carb idol mixture screws are clean
Carb metering rods and springs are clean.
Carb looks clean from above
Metering rod housing look clean from above.

Next I am going to check vacuum. Then I will go rent a timing light to check that.

After that I will open up the carb to look at the jets and floats.

After that I will take off the valve covers and look in there.

Stay tuned.

 

[wsutard]

 

[wsutard]

Ok I really don't see anything wrong with the carb.

But, not sure if gas is supposed to sit in those areas like that. Look at the pics. This has been sitting over night.

 

[RT K_line]

I see you said the idle mixture screws are clean but it's the passages that usually cause the issue. Spray carb cleaner into the holes that the screws came out of. You need to use the little straw.

 

[Lionized]

Gas is indeed supposed to sit in there.
Check your float height while you have it apart. 7/16"

 

[wsutard]

Yep I checked the float height it's right at 7/16

 

[GetX'd]

Do you have a fuel filter on the line? Could be as simple as that being clogged.

 

[wsutard]

Do you have a fuel filter on the line? Could be as simple as that being clogged.

Yep, transparent kind. It's clear.

 

[gtxno1]

What did the vacuum guage say

 

[IQ52]

You revved the living crap out of it for 10 seconds and people think it is the carburetor? The valves floated and something bent, broke in the valve train. Compression test, leak down test.

 

[gtxno1]

How many miles on the engine

 

[wsutard]

What did the vacuum guage say

Haven't checked yet. So I do it cold or warm?

How many miles on the engine

Unknown. I do now that not a lot since it was built. Previous owner didn't drive it much.

 

[gtxno1]

This how we would actually diagnose in the past Vacuum guage, timing light, tach and dwell meter fuel pressure gauge compression guage we did not randomly tear anything apart without test results pointing in that direction might as well get the wheel out and spin it and see where it lands

 

[Dennis H]

You revved the living crap out of it for 10 seconds and people think it is the carburetor? The valves floated and something bent, broke in the valve train. Compression test, leak down test.

He romped to 6k during a burnout. Not unloaded over-revving. Big difference. Nothing should break.