Your welcome for the diff.. .lol You want aggressive you get aggressive. haha.. Rallispec blocks started out with Wiseco Pistons, then Dave used a few sets of Manley and those are ones thats burned oil because at the time Manley had no lock on the top oiling ring, however since have fixed that problem. I have used them a few times since without any issues. Then the cost of cosworth pistons came down and Dave has been using them ever since that Im aware of. Im not sure cuz Im not there anymore. But Id imagen its the same.