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Originally posted by Myxalplyx
Wow! This is really REALLY good info. I never read anything like this...even at USMB (which I am sure it's there...somewhere). You say 'underneath the cylinder heads'. Does this mean inside the engine or on the lower side of the car? Did all turbo models (RX turbo, Legacy, etc) have this casting number....some underlined and some boxed? Or did it just apply to the XT Turbo? Good info! I know what else to look for when picking an older model turbo now. Thanks!
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The casting number is on each cylinder head. You need to get under the car to read them, but once there, they're pretty obvious. I can't speak to any other vehicles but the XT. Mine had the latest upgrade -- number inside box -- because the original owner had the original heads both crack. On the turbo, I would regard this as perhaps the most critical thing to look for, assuming the car is good overall.