Do not put a POS Block Gaurd in your motor. I was warned and i put one in anyway. I was a inexperienced dumbass! It distorted the shaped of the cylinder wall and restricted the coolant flow in the head. My compression sucks and the car runs 20 degrees hotter in the head than it should. Because it runs hot i blew a head gasket. You can leave the block alone for a low power set up. You can post the block for a little more power. You can sleeve the block and never worry about it again. NO Block Gaurd!!