A rod will twist if there is a small hydrolock. It could be detected probably by looking at piston position at the top of the stroke. If the rod is twisted a little it also will sit low.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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