I've done the poppit valve upgrade and have very responsive pressure readings. Only problem is that at WOT, my pressure is getting up around 28 or 29 (the gauge is maxxed at 30). Before swapping PCVs to the new style, I was only getting around 20-22 at WOT...but the new spring could cause greater pressure if it is stiffer than the old. Anyone know what the upper end is recommended? I put the vavle in with the rounded end facing the block and the guides on the spring. I've read here and elsewhere that it can go that way, even though parts diagrams show it the other way with the guides in the grommet. Anyone know if it makes too much of a difference? Thanks.