Thanks for the input, guys-Duane, can you pm me a price for the wear ring, and possible delivery time? The boat currently has a mild 455-Torquer manifold, ported and polished Ka heads, Comp 292 cam and logs. It was able to turn this A impeller to 5050-5100 rpm, which is about all I care to spin it :2purples: . I am considering a "B" impeller, just to see if it would improve the boat's performance at all. The motor has all the standard oiling system mods, including oil return lines drilled and tapped at the "dogleg" in the heads, so oil starvation shouldn't be a problem. Thanks again, Stan