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I had Pontiac J2000 and Buick Skyhawks with the infamous 1.8 OHC engine, aluminum head, iron block. You had to use magic sealing materials on it and torque in order and absolute precision. First one blew at 38K; second at 140; the J2000 blew at 90; I called up a GM mechanic and asked him if I had done anything wrong, only getting 100K out of my repair.. He said, probably not, no one had ever gotten that many miles out of it before...
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