I want to put a 6# lower on my 2002 Harley truck. Is that too much for the engine? I'm running a 3# on the sc and 4# lower with a Diablo chip and intake system. I would have the chip burnt and run C-12 fuel. This is not my daily driver. Will the bottom end and the head gaskets tolerate the added boost? Also, I heard that the L had a tougher bottom than the HD, is that true? If it is then I need info. from someone who has ran that much boost on an HD.