Quote Originally Posted by JohnL View Post
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).
you said it right there yourself, with a weaker spring on a very tight clearance, the spring may not have enough pressure to push the valve all the way home...

its not going to be an issue as the AUDM K24A3 has the same spec as the K20 anyway... but if it were the K20A3 or the USDM K24A3, then yeah it might cause problems...