Intake Fit Question

[BeerDontCount]

Does anyone know what the carb pad height is for the Ford spread bore intake for the 73 CJ 4v, D3ZE-9425-AA either with or without the EGR plate? Pic is below.

I am trying to determine if I am one of the lucky ones that can fit a Blue Thunder manifold under my ram air set up. I know what the carb pad height for the BT is, and I know how much my current set up has to spare, but wondered if that measurement was known. My web searches haven't turned up anything.

Much appreciated,

Scott

 

[jbojo]

To determine the carb pad height, add dimensions "A" + "B" and divide by 2.

 

[BeerDontCount]

Thanks John,

Looks like I'll need to get under the hood and try to measure without pulling the carb again. I know that question was pretty obscure. Figured it was easier to ask, than measure..... Thank you for the calculation formula.

Scott

 

[jbojo]

Thanks John,

Looks like I'll need to get under the hood and try to measure without pulling the carb again. I know that question was pretty obscure. Figured it was easier to ask, than measure..... Thank you for the calculation formula.

Scott

If it helps I have the Ram Air with the BT intake in my 73. I have the 4V Q code too. Not sure if Carb heights are different though and could affect the fit. Look at this thread when I was trying to determine if this would work.

http://www.7173mustangs.com/thread-ram-air-help--20045

 

[BeerDontCount]

So I measured the carb height as best I could today, and came up with the following:

A value is 3 3/8"

B value is 4 5/8"

Carb pad height per calculation is 4"

EGR spacer and two thick carb gaskets = 1" so effective carb pad height is 5"

The Blue Thunder manifold is advertised at 5 1/32" so it looks like it might fit. I took a video of the ram air rubber seal compression as I closed the hood and it just contacts the hood when it completely closes, so there should be a little more room to compress if needed.

One question. Do I need to run a spacer between the intake and carb with the BT to keep the gas in the carb from boiling off after it gets hot, or will a normal gasket be fine?

Thanks again for the info and help.

Scott

 

[jbojo]

Can't help you here as I used EFI so I didn't use a spacer.

 

[4mm]

I would try to find/use a 1/4" manufactured wood or phenolic spacer. You should be fine.

 

[jpaz]

Normal gasket should be fine. The Blue Thunder intake is a high rise manifold so carb is up a bit more & away from heat. I plan on putting one my engine with just a normal gasket. Many others have done this with no problems.