Hi Emilios and everyone, if the 357 cam is the " sports cam" then I can say that they work with an iron head ,whenrebuilding my engine I used SRM to do most of the engineering work, iwanted an alloy head but wouldn't wait so they fitted super rocket valves and supplied a superrocket cam, they insisted that I change the followers but that was all ,so far nearly 10 yrs on no probs at all and still runs sweet and clear ,tremendous low down grunt ( for me ) I'm sure i used standard settings when doing the tappets. regards BobH