Ireland Engineering
BimmerHeads
Be advised that HD rocker arms are not a silver bullet. There were a number of cases where the steel foot detached from the AL rocker. IE says that this was limited to QC problems with early runs, but I’m not so sure. Personally, I’ve been running HD rockers w/o trouble for 5(?) years, but I know of other folks that had problems.
IE has not been that great about replacing broken rockers. Bimmerheads has committed to doing so.