I putting a new Y pipe on a 89 4.3l. where the exhaust manifold and y pipe meet the bolts are tightened with a spring. oldly and thankful i was able to save the two stud where it looks like its impoosible to slide a bolt through on each side. so i saved the one stud on each side and it looks like you just tighten the nut until it bottoms out where the threads stop but what do i do with the 4 regular bolts ? how tight or how much torque should i use? thanks