I bought this complete 3.8 SC engine, years ago, and I am finally going to install it in my 1989 white, 5 speed SC, with a bad rod knock. The story when I bought it, is these airplane guy's bought 6 of them on pallets, that were from the factory, and never used. I pulled all the plugs, and the pistons looked near new, except cylinder #4 piston was black. The plugs look like new, and all the same. Even have the dab of silver paint on the terminal. There is some florescent pink marking paint on the crank, and water pump pulleys, and the main engine wiring harness has been cut off also. I did a leak down test, and number 4 was 16%, and number 2 was 6%. I'm now thinking this engine failed the assembly line "Hot Test", and was rejected. Anyone ever heard or something like this? I'm going to install it anyway, and see what happens.