i tried to take pics the best i could but not the best i guess and i couldn't take pics of the mods to the crank casing but what i have learned by pulling this engine apart is that this is not a RB that has been modified this engine is so unique that every part out of this engine is out of different RB's.
It looks like a T11 but inside there is like 3 to 4 different RB's.
eg- Bi turbo crank, Higher exhaust port, hand machined crank NO silicone etc.

Here are the internal pics sorry about the pics not being the best.