About 7500 miles ago, I noticed a bad knock coming from my 89lx 1.9. After pulling the valve cover, I started it up (idle only) and put a round wooden dowel on each rocker arm stud, and then to my hand against my ear. The knock was coming from #3 intake valve. After pulling the roller lifter, I noticed that it was frozen, and had a flat on it where it contacted the camshaft. It had not been rotating well for a very long time. The roller bearings were frozen, and their races were out of round. I was concerned about the cam lobe, but found it impossible to evaluate. It went to the junkyard and pulled a used roller lifter and put it in the engine. It looks like the operation was a success. After 7500 miles, I pulled the lifter out and it is in perfect condition. But I have a question.. I got a rebuilt roller cam for it on ebay for $15 and I am wondering could I slip the rebuilt cam in without changing the old cam bearings. I mic 'ed it out and it would be a perfect fit, but the cam bearings could be an obstacle. The motor has 200,000 on it.