The engine I just pulled out of my 98 Clasic has a casting num that I can't locate anywhere. On drivers side front casting num is 530 | 0341 just above to the right are the letters NVH in the rear same side above freeze plug third from rear 4.0L 7, under freeze plug 5 is a clock dial pointing @ 2:00 & finally under freeze plug 6 is 10 | 97.

I can't find this casting number listed anywhere. Anyone have any ideas on what this came from, as it's not in any book I can find. I wanf to rebuild 1 of these engines. The 91 is correct and the replacement I just put in is correct for 98. It's got me stumped. Help ! ! ! Thanks