On the 472 Cummings built Hemi's I dealt with, 528 head gaskets used on some of the 472's before Cummings caught it, resulting in blown head gaskets, or coolant leaks, really nice after it's in the car..,.according to Ernie at Cummings, approx 50+ 472's went out with a bad batch of Comp Cams castings (China),....got one ,....also the rocker adjuster screws weren't tempered right, too hard and brittle, either end will break off,...2 out of 3 engines had the rear main crank seal installed backwards.....



Tear it down, and go thru the whole thing, run the block number thru Cummings, they'll inform you of potential problems, warranty on the Engine is 90 days from purchase,....so that's out the window for your customer's engine



Mike