390 intake problem

[johnnyreb]

I have a 74 -2 barrel intake--with a 2x4 adapter to a 4 barrel Holley. I was talking to a friend about it and the intake below the carb. Has a extra hole that is about 1/2 in round. He said he had heard . When Ford started with this intake with the hole in it. They started having troubles with it and discontinued using them. Has anyone else heard this ? Hear is a picture of the intake and you can see where some heat escaped. He said he had also heard it melted part of one carb---.

 

[Tiha]

Have not heard of that, but can't wait to see the picture.

 

[johnnyreb]

Have not heard of that, but can't wait to see the picture.

I,m trying to get them up .

 

[johnnyreb]

390 intake (1974)

 

[johnnyreb]

I have also noticed some marks(some look like scratches and burnt marks) I was thinking they could cause air leaks and if it was to be used. Have it smoothed out and the hole filled in.

 

[svttim]

Looks like early EGR. Definitely eliminate it

 

[Motech]

That is an exhaust port that feeds the baseplate that holds the EGR valve. Like this one.



You'll need one of these if you want to mount a carburetor to it. You can block off the EGR from there if necessary.

 

[johnnyreb]

That is an exhaust port that feeds the baseplate that holds the EGR valve. Like this one.

View attachment 31384

You'll need one of these if you want to mount a carburetor to it. You can block off the EGR from there if necessary.

I have a couple of them out in the building. Thanks Motech. If I am not mistaken. I think the 390 I had in my 66gt had one on it.

 

[johnnyreb]

Well I did notice on the top of the intake.Some black soot. Since Ford supposedly had trouble with it and quit using it. Wouldn,t it be better to block the round hole off?

 

[Motech]

Well I did notice on the top of the intake.Some black soot. Since Ford supposedly had trouble with it and quit using it.

Wouldn,t it be better to block the round hole off?

Maybe, but you're still going to need that plate, and the special, $$ gasket too.

You could possibly put a freeze plug in one of the holes to keep the heat out of the plate and away from the carburetor base.

 

[johnnyreb]

That is an exhaust port that feeds the baseplate that holds the EGR valve. Like this one.

View attachment 31384

You'll need one of these if you want to mount a carburetor to it. You can block off the EGR from there if necessary.

 

[johnnyreb]

I found a few yesterday when I got back home. You,ll see the aluminium was being burned out from heat and the steel one was not and is a better part. I also found some gasket material. To make my own gasket--in case I cannot find any at the store.

 

[johnnyreb]

steel spacer from bottom

 

[johnnyreb]

steel spacer--notice the bottom is NOT burnt out like the aluminium one. Thanks Motech

 

[wyo58]

I have a 74 -2 barrel intake--with a 2x4 adapter to a 4 barrel Holley. I was talking to a friend about it and the intake below the carb. Has a extra hole that is about 1/2 in round. He said he had heard . When Ford started with this intake with the hole in it. They started having troubles with it and discontinued using them. Has anyone else heard this ? Hear is a picture of the intake and you can see where some heat escaped. He said he had also heard it melted part of one carb---.

Can't remember that off hand Johny, maybe a picture will refresh my memory.

 

[wyo58]

steel spacer--notice the bottom is NOT burnt out like the aluminium one. Thanks Motech

Yeah for sure that was the early egr port from inside the engine. Those all caused some problems at the carb spacer and internal in the engine getting all plugged up with carbon. if it is open and you have a rich or oil soaked cylinder feeding those ports, yeah it can get real hot in there.

 

[johnnyreb]

Yeah for sure that was the early egr port from inside the engine. Those all caused some problems at the carb spacer and internal in the engine getting all plugged up with carbon. if it is open and you have a rich or oil soaked cylinder feeding those ports, yeah it can get real hot in there.

I guess I,ll have to replace the intake . I hate that. That intake weighs 88 pounds and is ******* the old back. I was looking for an alumnium one . The new ones are over priced and tried to find a used one with no luck. Guess I,ll switch out the old one with a steel one. Thanks.