E48 Intake Manifold?

[Jetaway]

Folks,

While digging around the junkyard today I came across what I wrote down as an E48 intake manifold. It was inside a 1971? 240Z (for sure) along with parts obviously not from any 240 -- 280 Z through ZX and others that may have been from a Z. It was a Nissan, dual carb, for a six-cylinder. Compared with the E88 on my 1972 it was very sparse, as a descriptor, I guess. Had a balance tube but I don't think it had a provision for coolant pass through. The runners were also more "tube-like" than on the E88.

I couldn't find a reference to it here, though there were discussions of an E46 manifold. Was this an E46 that I just wrote down wrong? If not, is it for a Z? Finally, whether an E46 or an E48, would it offer better breathing than the E88 I currently have installed?

Chris

[Bruce Palmer]

IF and it's a big IF there is any difference one manifold to the other would IMHO be between the flat top manifolds and any of the three or four screw manifolds.

FYI the 4 screw manifolds have carb mounting flanges that are square while the 3 screw manifold has the drop down between the bottom 2 bolts with the holes for water into the carb body. The flat top manifolds have the drop down section profile but no water holes.

Looking in the runners of the 3 & 4 screw manifolds they appear the same. The flat top manifold looks to be more open and "might" flow a little better. I have nothing to back that up with but they did change the manifold when they went to the flat top smogger carbs for some reason. Trying to determine imrovement between these manifolds would like trying to seperate the fly s**t from the pepper.... Anybody want to step up for a little (read that a lot) of dyno time??