I bought a 97 aroura that had a 4.6 NorthStar put in it . Trying to find out more about this motor so I can get the right parts to fix it when the time comes . I have located a number etched on the side below the #1plug but can not find any charts to explain said number . the number is 6TU298495 I also have seen a large #9 molded into the block just above this number and also #46 just above the exhaust manifold . any help would be greatly appreciated seeing as my local gm and caddy dealers were not interested unless I made an appt for service .