ECZ - B intakes for what ever reason, don't have the front vacuum hookup found on 2 bbl intakes, so who makes a carb spacer that includes a place for fitting the vacuum line?  And what thicknes is the spacer?  It's for a 57 Ford & a thick spacer, I" or more, may not allow hood clearance for a stock air cleaner.. ( I should have thought of these issues earlier! ) And yes, I'm aware that there is access at the rear of the intake, but Ive been advised that a hookup of a PCV there is not recommended, because of a possible lean mixture issue . Info appreciated.


Paul

It does seem like they were easier to find at one time.  If you search eBay for pcv carb spacer, a few options come up.

However, you could be better off to make your own.  For one, you want it to be a divided or 4-hole spacer.  Second, given your search for small bore carb mounting gaskets, you want the holes to match the carb and intake.  Thickness will probably be a minimum of 1" in order to fit a nipple of some kind.


Lawrenceville, GA

On a 4 hole spacer where would the ideal place be to put a hole? Wouldn't one port be lean?

Durham Missouri

You need to make the outlet between the primaries equally or yes you will have issues



"Came too close to dying to stop living now!"

It would have to be dead center at the front.  Probably the best way is to drill to the size required to tap for the fitting, just until it breaks through to one or both of the throttle bores and then use a smaller drill bit to finish the passage to each bore, so they are equal as possible.
If you have a spare intake laying around, look at that passage on the back runners.  It's drilled the way I'm trying to explain.  Same idea for a pcv port in a dual plane carb spacer.
Oh, actually I do have a picture of that port.







Lawrenceville, GA

Paul -  it's kind of expensive, but CASCO has a conversion plate (actually a kit) for a PVC.  . For "B" intake, part # 6758A


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Thanks Charlie. One last question. Why do you recommend putting it in the front?

Durham Missouri

Front will be the most centralized location with the a/f mixture in all situations.  If it is placed anywhere else, the crankcase gas will favor the cylinders closest to the pcv port, which will lean those cylinders more than the rest.  That's why the port at the back of the manifold is not the best idea.


Lawrenceville, GA

Thanks everybody.. That brings to mind that if the spacer is 1" thick or more, there's the possible hood clearance issue + the "B" intake mounting studs are likely to short for any 1" spacer & the carb base, which is about 1/2" thick.  And, of course the studs are N.C. on the bottom & N.F. on the top.. Back to the planning board..


Paul

Studs are easy to find.  https://www.summitracing.com/search/part-type/carburetor-fasteners?N=4294921312&SortBy=BestKeywordMatch&SortOrder=Ascending&keyword=carburetor%20studs


Lawrenceville, GA