I think that A LOT, if not ALL of the suggestions made are valid points, especially when analyzing over an internet forum and not being right there to check out the car....

Fishslayer had a good amount of valid points with his analysis...

 

 

Come on boys. Let's play nice now..

 

Firing order is correct:

 

FISHSLAYER143 and BOSTONCAMARO have both helped me a great deal, even though i havet found the problem yet, they took the time to help me understand what i need to do bit by bit, even tho alot of this is new to me, they kept their patience, with help and extensive knowledge that they have, im likely to find the cause, and hopefully help anyone else with the same or similar problem. Keep up the good work guys, people like that are what make forums like this. So keeping on subject....

I havent had chance to run the engine to test much due to the noise and im in a town house. But i took off the air filter/cleaner and found a fine dirt/dust all around the inside of the carb.... i then noticed there is no seal between the filter and the top of the carb (i would assume there should be?)

When i took the filter (excuse my terminology and correct me) the front flap which was the width of the carb (covering 2 holes) which is rectangle was open about 1/4 inch... as soon as i touched it it snapped closed, is that what the choke adjusts?
i will use carb cleaner or seafoam and give it a go....

could this be the cause for one cylinder to get hot?

Is there anything else i should clean?

 

I'd like to ask a couple questions to help me understand the problem.

Let's start from the beginning. You have been driving the car with no problems. Buy a new set of headers, put them on then this problem came up. Right? No other problems? Nothing else was changed?

 

Its all in the previous posts....

But in short, original owner did minor modifications to the engine, (cams, rockers, carb) with zero miles on it, i bought it, changed headers and plugs.. i still have zero miles on it as its not complete

It was heating #7 primaries on old headers and now the new headers.

 

Sounds like a vacuum leak to me. I see where you checked the top side of the manifold....how about in the valley? The intake was removed to do the cam change....maybe old gasket wasnt cleaned off good....maybe wrong gaskets put back on?

 

I sprayed carb cleaner all round the intake, carb, all the bolts holding them down, vacuum pipes etc and no change in idle speed

 

I saw that. I'm talking about the bottom of the manifold. The underside. I've seen gasket material left on the head or manifold....install new gasket and have a vacuum leak there.

 

I'm about to replace the intake gasket.
The original gasket had a hole in the middle if the 4 ports.
The new gasket doesn't.
Should i put a hole in for the heat exchange channel or not?

 

I replaced the intake gasket and I'm still getting #7 glowing.
I played with the timing advancing it for around 28-46 without vac at 2500 rpm.

 

So I replaced the #7 plug when I did the intake gaskets so I could get a true indication/coloring on the plug
#1 and #7 left to right

 

have you changes out that dist cap

 

brady
u should be out driving it around.
holding it at 2000 for a few SECONDS is a test i use to see if the carb has started flowing from the booster. usually that is too low a speed, and it could go very lean.(red hot)
so drive it and see how it runs in the real world. Try 17* base timing. if it pings, back off. Drive it to autozone and get a vacuum gauge.

 

You mean tried a new distributor?

If i have to do base timing at 17, what's an acceptable mechanical advance and how much total advance.

 

What is the hose connected to on the back of the intake manifold? Brake booster? Try plugging that fitting on the manifold. Will the engine idle....900 rpm?

 

.
By now u drove to autozone and got a vacuum gauge. Did it ping? If not hook up the vacuum gauge.
Can't de-bug a car without driving it.

 

Do you have mufflers on it?

 

I have driven it a couple of miles, that last pic is of it after that drive.
I havent set it to 17* base yet, i wanted to know a safe mechanical advance and total advance as i read its not good to have too much, and i dont want to bust my engine... just being safe rather than sorry.

When you say ping? please elaboarate.
I have a vacuum gauge.


yes, obx headers and side pipes with hooker max flow inserts

That hose connects to a black cylinder (drivers side near corner).... im assuming this is the booster?
Its also hooked up to the headlight switch, some part of the heating, the bar right at the front of the car.... excuse my terminology

The engine will idle at 900 or a little less.