"These springs can handle 12k+ RPM with any camshaft ...." OK, but let's have some actual specifications, please.
What is the spring pressure at what open valve heigth? How much do they weigh? What are stock Honda spring specs?
Stronger springs use horsepower, wear the valve train faster. 12k+ RPM engines don't last long. These sound like full race springs.
Another option between this and stock would be nice for big cam, big valve, 10k redlines, which would really extend reliability.
