Rear main seal

[Insert Quarter]

I always wondered what application that was for as well. It's not for the 5.7 and it's not in any of Fel-Pro's full engine gasket sets for the 5.7 either.

https://drivcat.com/overlays/part-d...=BS 40520&partType=Engine Crankshaft Seal Kit

 

[Markmartin01]

You also need to dab the corners of that main seal block where it meets the pan. 100% chance of an oil leak if you don't.