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Yes, especially in a SS-2.5, where it should be a very high-revving engine.
You may develop cracks near the welded journal. The higher it's revved, the greater the harmonics acting on the crank, and the greater potential for failure.
If it's just going to be a street motor, it may be O.K., but I wouldn't risk it. Never go cheap on major internal parts that could potentially destroy the entire engine.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer)
'72 911T Targa MFI 2.4E spec(Formerly "Scruffy")
2004 GT3
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