Vapor explained the o-ring situation to me. While the thick O-ring was the correct choice, I wanted to know why. He gave a very clear, direct answer that will mean yes, I will tear apart my block and replace the o-ring.

I understood certain parts of block topography and why we want a perfect surface for mating, but I did not understand completely concepts like a flexible bow or IHS deformation, which are taken into account. He set me straight, and for that I'm thankful.

It doesn't matter to me which way we do things, so long as I know why I'm doing it. I simply wanted to know why the bowed would perform better. Maybe he should post the real answer here-I'm sure I'm not the only person who has wanted to know why.