Glad we're in the same boat. Stay in touch via e-mail, we can compare notes. I'm not exactly sure what you mean. Are you talking the stock manifold or the QK manifold? The back end of the QK (where it meets the cylinder) is wider and taller than the stock. Come to think of it, I haven't measured the intake port on the cylinder and the back parts of the intake manifolds. I should do that to have some solid numbers and comparisons. But no, there was no red stain on either manifold. Let me know if that answers your question.