Bought this from a member and just got it yesterday. Take a look at the heat riser. Also, it is a LD4B but the 4 is missing. Doesn’t appear to be machined off. I’ve never seen one like this.
No idea why the hole in the heat passage. Mine is plugged.Oh, I’ve had many and I know about it’s over the counter status. It’s the treaded hole over the heat riser port that throws me. It’s not a mod. The hole was cast. Of course I’ll insure the mating surface are true and will mate up to the engine.