lfinney,
I'm flying an OPS redhead rear exhaust (from the late 60's) in my Saturn pattern ship. It runs great with lots of power except when I go on a vertical upline. It cuts out badly as if it is going too lean. I haven't had time to try solving the problem yet. I'm hoping it is simply the pickup being to long in the tank. Had a couple people tell me bad bearings may cause the problem, but the bearings seem to be fine as it runs very smoothly at all times except the vertical upline. BTW it has a tuned pipe on it. It's not like it is coming off the pipe, but as if it is going lean.
Hopefully you or someone may have some ideas of whats wrong.

Ralph White, Neoga, IL