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It does not appear that the crankshaft shown on your site is forged. Hard for me to be sure, but from these pictures:
http://epic.mcmaster.ca/bill/volvo/image_db/b234f/b234f_teardown%20(025).jpg
http://epic.mcmaster.ca/bill/volvo/image_db/b234f/b234f_teardown%20(013).jpg
It appears to have a skinny parting line down the center. A forged crank would have a wide line. This picture shows the difference:

The crank on the left is a forged b230 penta marine crank, 86mm stroke. On the right, a cast b230 crank from a car engine, 80mm stroke. Not my parts, either.
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forums.turbobricks.com
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