Thanks... but I looked and couldn't find anything about Gaterman lifters..

They do list Crane lifters in their catalog...

 

Did any one think maybe the more lift on the cams are jerking the cam chains more than the stock lobes did. When a cam lobe is opening the valve it has a lot of spring tension on it and the chain is pulling real tight. When the the lobe come across the top now the valve spring is pushing slack in the chain. Put all the lifters you want any brand and you cant stop this it is the way it is and the way things work. Smoother circle=less noise more lift means pointed circle more noise. Put stock cams back in and see if noise dont get better.