Id install it and go from there. R could stand for anything like a brand, remanufactured, reproduction model, right.
Im 100% sure that it wouldnt stand for reverse. The only thing that pops into my head with a reverse flow cooling system would be a GM LT1.
The fins are going the same way so your Good To Go!.... Like a crunchwrap from taco bell
2014 JKU Sport - Wife's Mall Crawler on 35s
1999 F250 7.3 - KT Performance Tuned TS 5-Pos - 1/4 Million Miles and Counting
"I am not going to censor myself to comfort your ignorance."