hmmm...can't say that i can add much the 275/275-585/585 cam in the sig car isn't real rowdy though it does have some duration. it was installed with whatever springs comp recommends for it (i think) and broken in with full pressure. i believe these are in the 140/360ish area. when first raced i had one exhaust rocker that needed adjustment a number of times and i said one more time and i'm parking it but it settled down and the valve train has been holding lash better than i ever expected. i had checked the lift with a dial indicator and it looked ok. one point to mention though i have no experience (fortunately) it that i would think if the lobe/lifter starts to fail it isn't gonna take long to finish off.