Thanks, Dads. It does look like a tight fit there against your manifold. When mine is in the closed position, the outer edge of the plate (the tongue-shaped portion that is furthest away from the engine) makes contact with the manifold so that it doesn't close completely. There is about a quarter inch gap that is left open. I don't know if this would have a negative effect or not, but I was considering grinding the plate down so that it no longer hits the manifold.
