My heads and valve train should support 1.4/1.5 rockets. I'm running dual high rev valve springs and these heads should flow, but I still need to look into clearance, compression, deck height, etc... Looking at the dyno results, the engine still made power at the upper end of the range and the HP numbers didn't really tail off like one would expect. I think there is more power to be had without going too overboard and sacrificing reliabilty. So I believe 1.4/1.5 rockers will give me a few more ponies and perhaps extend the power band to maybe 6K. I've never had a large T1 before and this is my first experiment with a narrow LSA cam. It feels different with so much power down low and hard to get used. It's still fun though.