As far as the hydro roller, i think those lifters are very heavy and require stiff springs to keep things in control. i'v had many solid flat tappet cams in my small blocks and never had an issue with any of them. as far as the solid roller, i remember installing my first one in my 408 years ago after pulling the SFT cam. I was disapointed at first. not much seat of the pants difference that i noticed between the two. at the track i think there was a 10th if i remember right. alot to think about here, but it will come down to available cash when i get to it. Cab thinks the 276 solid roller is too large for what i'm doing. Does everyone else feel the same? Would like to dial in a size here if i should go roller. Thanks