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The con-rods can be replaced (if you think there's an issue with them) by pulling the head off, disconnecting the rod cap on the bottom and pushing the piston up out of the engine block with a wooden dowel like a broom handle piece. It is likely, however, that a shoulder of glaze will have built up on the top of the cylinder that will make it hard for the piston to come all the way out. If so, you'll have to push the piston back down, remove the glaze and then pop the piston. Before reinstalling the piston you should cross-hatch the cylinder wall and use new rings. It can all be done with the engine in the car.
If you don't have known rod/piston issues, I'd avoid this process. Unless you do all the cylinders, you'll end up having one piston that will have higher higher leak-down resistance and compression numbers than the other ones.
Replacing the rod bearings is a common "while you're in there" procedure and should include inspecting the oil pick-up tube for cracks and using new rod bolts when putting it all back together.
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman.
Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved.
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