Quote Originally Posted by EUR003act View Post
the main problem you might face with the tighter settings is that the valve doesnt seat properly with the weaker K24 springs, equalling loss in power
I'm having trouble seeing why that would be the case (with any springs if the only variable were the clearance), unless the clearance was so tight it wasn't really a clearance at operating temp...

The problem with weaker springs usually occurs at full lift as the valve train 'overshoots' the cam profile due to mass intertia, and perhaps a slight bounce as the valve seats, if it seats harshly (which should I think be more gentle with a lesser clearance).