I assume your talking about the plenum gasket ...aka...belly pan gasket. Use this thread as a guide. It's a great write-up.98bigblue said:I'm looking to do my intake gasket on my 98' 1500 with the 360. A guy told me that you need to replace the valley pan, and the bolts or it will just leak agian in a few months. Is this true or can i just slap on the gasket kit and be done?