Intake Manifold Spacers

I recently made some intake manifold spacers for my Impreza, since I had some extra material I figured I would make a set for the Outback too.

I always liked the ixizIce intake manifold spacers because they measure up well to the phenolic spacers for heat transfer and are thinner, only 3mm instead of 8mm or so. The issue with the ixizIce spacers is that they are made for the turbo heads, thus they do not have the correct guide pin pattern for the EJ251/252 heads. I did a bit of research and it is likely that they are made from G10 material. So, I ordered up a sheet of 1/8" (~3mm) G10 material from MSC Direct and got to work hand fabricating some.

I just traced them out on the G10 and then began working it with my drill press and a variety of Dremel bits. It was a bit of a trial and error process, but at the end I was using a few different carbide burrs, a sanding drum and a drill bit to do them. Still took a little while to do each one. I spent the most time on the intake port as it is most critical, the other stuff could be rougher and not affect anything.

First port done.


First spacer done, matched up well.



Both spacers done.


I'll install them with a new gasket on each side at a later date.