thank you kai! u gave a lot of useful info. now would it be helpful to put the D16A1 head on my crx block? woudl i be able to find things suchs as headers or cams any easier. and once i switch to that head are there other blocks that work with the D16A1 head? and jsut to clear it up the D16A1 is dual cam isnt it? ill need a new timing belt rite? thanks for ur help.