Roller Rockers

On a track day back-to-back test, we replaced the MP HD stamped rockers with a set of 1.5 cranes, with pushrods and setting preload on a mild 440. Car runs high 12s all day, regardless of weather. It picked up about .04. So we switched back to std rockers...lol. I dont think you'll see much gain at all. I've run irons for years.