Gregski

If I am not concerned with SMOG and emissions can I replace the mid '75's EGR carburetor spacer I have now with an early '71 style non EGR one, or better yet do I need a spacer at all?

My Motorcraft 2150 carb has a PCV port on the base of it, so I placed the carb on the intake manifold without any spacers and I did not have any clearance problems. I did google carb spacers and I guess they serve a purpose other than giving you an inch of height, but I figure I ask you anyways if I need one. I figure with it I can have leaks between the carb and the spacer as well as between the spacer and the intake manifold, so I am thinking why not just eliminate it all together.

Again I am new to this car stuff so please be gentle. Pictures below:

Gregski

Here are the three spacers I accumulated from junk yards. They look similar but the two smaller ones have a base plate that is narrower from front to back they are 3 inches by 5 1/4 inches, the big one which is what came on my engine measures 3 1/4 inches front to back and 5 1/2 accross. So when I use one of the two smaller ones there is a small gap between the spacer and the carburetor.

At this point I am thinking of keeping my original spacer and fabbing a EGR block off plate, no big deal, but I wanted to use the spacer in the middle without the nipple for a clean look since my 2150 Motorcraft 2 barrel carb has the PVC nipple on its base already.

I'm sharing the pictures and part numbers to help someone else down the road.

LEFT: D2TE-9A589-BA (but the year stamped in the circle says 71)

MIDDLE: no part number (but the year stamped in the circle says 72)

RIGHT: D50E-9A589

my77stang

As long as the carbs 2 barrels are sealing against the plate and the plates 2 holes are sealing against the intake you should be able to use either of those other two spacers, and from what I can tell from the pics it looks like they would seal fine.

Just curious, have you considered either a 500cfm 2bbl or a 4bbl intake and a 600cfm carb? you'd def pick up power. If you wanted to retain an original look ford used the bigger 2 bbl's on alot of the big blocks in the 70's so you could probably find one in the junkyard for cheap. Think LTD's, trucks, etc

Gregski

Since non of the non EGR carburetor spacers would work with my EGR manifold I decided to make an EGR block off plate out of 1/4 inch thick piece of steel I found in the garage, probably overkill but less cutting. Please note the different bolt sizes, I have no idea why Ford did that, but one is bigger than the other.

Norm Peterson

Did you use some sort of gasket? It's pretty hard to guarantee absolute leak-tightness otherwise, and any leak will have its greatest effect at idle when air flow is lowest and vacuum highest.


Norm

MDNTRDR

definitely put some rtv or some sort of gasket on that block off plate. My understanding is the spacers main purpose was to insulate the carb from engine heat and prevent vapor lock (fuel boiling off in the carb into vapor and leaning out the engine till it stalls) and also to straighten out the airstream from the turbulence of the carb throats.