I don't know much about the history of my motor except, that the numbers match & seems to run really well. A quick check of my compression with a cheap (auto parts store tester) revealed: 130 x all 6 cyls. (Actually 1 cyl was about 128). The odometer reads 109,k I'm assuming the motor was rebuilt at some point but don't really know. Are these compression readings acceptable for a stock motor?