Why would duals make a difference? Doesn't the top plugs system live on top, and the bottom plugs system live on the bottom? I have a single LS installed on the top, the coils mounted on the case just to the rear of the spider. Scott At 11:06 AM 12/10/2003, you wrote: >Has anyone with a Lycoming and dual Light speed ignition found a good way >of mounting the injection spider? bg