Rotate intake manifold 180 degrees, twice!

While we were brainstorming how to get cooler air into the engine WE THOUGHT it was pretty obvious that if we flipped the neck on the upper plenum it would put us a lot closer to the intercooler. Picking what seemed like the perfect place to cut we dove right in. A few minutes later the plenum was in two pieces. What wasn’t obvious until it was too late, the inside of the manifold is shaped like a D. Realizing that a transition would cause more restriction than the stock configuration we decided to make the best of the situation and smoothen out and polish the inside of the manifold. That created another challenge, I don’t have any bits for the die grinder that were long to reach inside even with the manifold cut in two. I purchased a drill extension I could use at low rpm (it vibrated very bad if I tried to go to fast), problem solved. Once I was happy with getting the rough stuff cleaned up I used a 1/4 rod with a slot cut in the end from a hacksaw to hold a piece of emery cloth and started to polish the inside. Once that was done we had the neck welded back in place and we were back to where we started, but with a cleaned up and polished intake manifold!