Anyone have a leaky dipstick tube on a 87-91 460?

Anyone ever replaced it?

 

I had mine out when I installed headers...I would unbolt it at the exhaust manifold, pull it out, clean the sealing area with brake cleaner on both the tube and where it slides into the block (use a Q-tip in the block hole), apply some blue RTV, and re-assemble. As an alternate you could purchase a viton o-ring of the right diameter and slide it on the dip stick tube to where it seals between the top of the block hole and the ridge on the dip stick tube.