Identifying my engine

[AugustDiesel]

I’m going to say H126 - August 12, 1996.

So that is what I was thinking as well, but, from what I've read the 506 didn't come into production until 1997. Unless they started production early in late 1996? If it is 1996, what does that indicate as far as the quality of the engine?

I'll be resealing the valve covers and oil pan soon, will look for main web/bearing cracks ...

[trbankii]

The 506 blocks seem to be well regarded. I’m thinking that the ’97 would match up with the ’97 model year - which starts late in ’96.