The difference in the Iron Ram head and the INDY /RHS head is that the Iron Ram (EQ hed) has enough material that you can cut the springs seats deep enough to get more installed height. RHS told us that you cannot cut the seats on theirs at all and Indy said they didn't know and they didn't want to give us a head to cut and see how far it could go. We like the heads. they flow good and have a lot of possibilites. They just have to get a better spring package or they are pretty much useless. Stock out of the box flow numbers on our bench are here http://www.hughesengines.com/Index/produ...mp;partid=25681
We haven't spent any time porting them yet but I think they have a good port design.
Kevin