What is the round thing with a 3/8" square in the center located in my valley pan right behind the turbo pedastal drain hole? It has vapor coming out of it when the truck is running. Thanks guys!
that is a drain for the valley pan/ bolt to hold valley pan down. to me it sounds like it is loose letting vapor past from the lifter valley. the 3/8 square should go straight threw into a passage that goes to the back of the block. make sure it is clear.
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