Originally Posted by sleeper7
four in the stock location and using the spacer in between the LIM and UIM.
I know you need the extra fuel, but that is probably not an optimized solution. The angle of the injectors will just be wetting the walls of the runners. Although, the 1680's are really terrible for atomization in any matter. The goal is to maximize atomization so that the fuel not only creates a more homogeneous mixture, but also more effectively pulls heat out of the intake charge. I understand there may be some other constraints that can limit placement of injectors, but if possible I would avoid mounting in this manner.
Also, are those two injectors in the primary runners going to be used? I know you're still in the build process, but I noticed they weren't plumbed yet. I'm sure you know this, but those reading that don't, the injectors need to either see fuel pressure or be sealed off on top. Otherwise it will create a boost leak as manifold pressure only needs to overcome the spring pressure holding the pintle shut (not very much..) to open the pintle and leak.
Edit: I noticed you were using a flow-through style pump. I'm glad you chose a weldon, but are you aware that their flow-through pumps are sold as being not compatible with alcohol/ethanol fuels?