than just one or two incidences. I'm just trying to get others to share their experiences on the issue. I'm rebuilding the engine to be a bit more reliable with forged pistons and boring out of the coolant galleys. Based on the research I've done and what's being discussed here, I'm inclined to turn the boost down as well. I thought 20/21 psi would be fine with WI on Sport 500's. Obviously it's not. Thanks for all the help thus far Man!