This is the Moroso spacer being matched to the ECZ-9425B manifold. As mentioned above, keeping the two halves of the manifold separate makes a better street combo.

Use a gasket that matches the carb base plate as a template - and make sure there aren't any edges sticking out into the airstream.

 
 Steve Metzger       Tucson, Arizona

Go with a 4 bore, Better for street. As far as height, I don't think it will make any big difference on how the car runs.





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

Stock 312, Holley 4150 4V 600cfm, ECZ-B manifold, late model OEM exhaust manifolds.  Two questions,  1 inch or 1/2 spacer, any thoughts?  Shouldn't I use a 4 bore spacer as opposed to an elongated two bore or an open plenum? or does it matter? the ECZ-B is an unmodified 4 bore, 1.5 inch, Moroso makes a 1.467 inch, 4 bore, spacer which likely matches the Holley exit bores in either 1/2 or 1 inch fiber or aluminum, not sure it's a big deal but putting it back together and might as well do it right.  Thanks

Ted, Redding, CA