That's probably right. The 7. 3 did not increase power much if at all. They needed displacement to meet emissions. You can add about 100 Hp with turbo and intercooler, any more and it WILL blow up. Stock, they are about a 250,000 - 300,000 mile engine if they are taken care of. At those miles they will need re-ringing and be using oil. Also, many 6. 9 had a block crack problem where they would crack between freeze plug holes on the starter side. Not a performance problem, but they seep coolant out the crack. I have tried to fix one once, but no luck. If you see any coolant or streaking on that side of the motor check it carefully. If it is comming from around the block heater, it is probably the block. Rumor is that IH let the castings cool too fast when they were made. This effects a lot of trucks. Many people never knew they had a problem. They can be a good economical truck, just don't expect the world out of one.