Holy !?@& there is some clearance with these TFS 12 degree heads! A few things contributed to this and trust me I was scratching my head on this one when I came up with so much. 12 degree heads designed to give more PTV than the stock 15 degree head, cam lift is also fairly mild, and I had ERL do a custom Wiseco piston based on the final deck height and the planned cylinder head. I'll have to double check but I think they moved the pin height slightly which contributed to the increased PTV.