My 5.9L has flat top pistons. I'm beginning to wonder what REALLY has been done to this truck.

 

you sure? pics or i call bs!

 

Scrape the carbon off of them and see if they have .030 stamped on them.

 

Are you certain that someone didnt swap a 5.2 in there? I know you did a trans swap, and I assume you did a new flywheel balanced for a 5.9... Then almost immediatly afterwords, had bearing failure. If you have flat top pistons, I am fairly certain it has to be a 5.2. Does your harmonic balancer have a notch in it? You probably already know this, but 5.9's have a notch and 5.2s dont.

 

This is what a flat top 5.2 piston looks like. (Found this one online)
target="_blank"><img src="http://i1288.photobucket.com/albums/b492/eb900/52flattops_zps84a2cdb8.jpg" border="0" alt=" photo 52flattops_zps84a2cdb8.jpg"/></a>

This is what a dished 5.9 piston looks like. (Took pic of engine in my basement.)

target="_blank"><img src="http://i1288.photobucket.com/albums/b492/eb900/dishedpistons59_zpsf6b224d3.jpg" border="0" alt=" photo dishedpistons59_zpsf6b224d3.jpg"/></a>

 

Ahh. I do have dished then. Thanks Scooter78. I was thinking of a different sort of dished piston - a concave style I'd seen before. Oh well I've got the right pistons then. RR, go ahead and call it BS - I'm with you

 

Ahhh. No problem, buddy. I'll bet you were thinking of pistons with valve reliefs cut in them.