You guys are whats keepin me chuggin along with this build so i gotta thank u all. I dont doubt u at all bio about the gaskets. I just dont know too much about using thicker or thinner head gaskets. these heads have manley oversized valves and figured they send 4 layer head gaskets because the valves opening up farther and kissing the pistons. is that what they do or do they open at the same as stock valves. sorry if i sound like a dumb ass so just help me understand.