I'm trying to figure out the length of the four bolts that bolt the head to the cylinder (not the head nuts) and are accessed I believe through the cam tower seals when removed. I don't have these bolts so I need to order them. I can't really tell from the microfiche. They list a 6 X 35 and a 6 X90 but not in the correct amount which is (4). Anybody know off hand??