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I just went through all this recently.
If there is a dimension specified anywhere for con rod big end size or the main diameter it is top secret.
We gave up.
Measure your mains and look for out of roundness. That's all you can do.
We were lucky, it was nearly perfect, close enough.
A reground crank spun beautifully in our block after torqueing down the mains. That is good, we went with it...
As for the rods, well, let's just say we didn't care what the stock Opel specs are. We knew the spec for the rods we used!
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No Opels were harmed in the filming of this movie.
However two Mustangs, a Pinto, and a Capri were hospitalized.
One Mustang was euthanized the next morning.
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