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My bad,Was date of Manufacture 5-90 by Herc.

I think mine also says Manufactured in 91.I will see about getting a picture.

I run all mine way up there in the RPM range and run them HOT on the pyro.No Failures yet from it.All my failures have been return line blew twice,Turbo let go(was sloppy when I put it on should have known better),Broke some rings when I let it sit for a full axle seal and bearing...

Go to Blackstone Laboratorys and order a oil sample kit.Drive the truck a little,get it up to temp and take an oil sample.There is a valve on the drives side of the engine behind the filter cans.That will tell you exactly what is going on.Only cost about 20 bucks.Could be a rod bearing,Wrist pin...