I just acquired a 6.2 engine and put in my truck i don't know if it is a J-code or C-code. I have VIN# from the truck i took it out of. the numbers are 1GTGR24J7HS523051 can anyone help with this. I am new to the diesel world. The engine has no emissions on it. It is an 87 out of a 3\4 ton 2wd.