ok .found out i bent a valve..LOL so getting ready to start putting back together.70 bbc 396 with steel heads passenger side.does every bolt need thread sealant.they told me put some on the bolt holes that don't bottom out.i checked with a screw driver and it looks like all of them don't bottom out and screw into a water passage.am i right or or does every bolt not need thread sealant.. i would hate to put all together and have a leak and have to tear it apart again...any help would be appreciated..thanks guys