Congratulations on reaching the milestone of complete disassembly! I have not done a Porsche engine yet, but I've done many others. Without any question, you are absolutely right to replace all your main & rod bearings after they have been disassembled. No questions asked. Even if they look new. Have you decided what studs and rod bolts you are going to use? I'd be interested in what you decided on that, and why. Raceware? OEM? ARP? Other?
As to the crank, the only surfaces that would normally be polished are the bearing surfaces where at the main bearing journals and rod bearing journals. Crankshafts are first cast, and are then ground and polished at the journals. If its not a bearing surface, it doesn't need to be smooth or shinny. Those other places look porous because of the casting process. However, the entire crank certainly has to be balanced. Therefore, you might see places where it looks like its gouged or cut; assuming you find something like that on your engine's crank, and it wasn't a failure that prompted the overhaul, that's normal. I assume that you are planning to send that guy off to a quality engine builder or machine shop to have it tested & polished before reinstallation - right? I can't wait to open mine up. Best of luck with it.
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Steve
'89 C4
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