Originally Posted by Paul@Cousins
I was getting alittle bit of hammer bounce so im going to try a stiffer valve spring when my madman kit comes in
You might need to go to a lighter spring, so that you can get less hammer preload on the valve, if you have the room on the IVG.
I think in the usual setup the valve spring is lighter than the hammer spring (from the madman kit), but it needs to match your valve and pressure range. "Just sayin", don't be surprised if balances out the other way.