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The engine has been rebuilt and someone didn't want to bore all of the cylinders and replace all of the pistons.

Actually come to find out, all saturn 1.9L engines are built this way in purpose due to problems with heat build up in cylinder 4. upon testing the #4 piston would seize up in the block once the engine hit 220 degrese. Re-boreing the #4 cylinder wall an extra .010 fixed the problem.

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Q: Why on a Saturn 1.9l is the cylinder 4 bore .010 larger than cylinder 1-3?
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