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I would expect you to split that block in half about halfway down the track the second time you launch it. The stock 400's were not very strong and the 4 bolts were the weaker of the castings. Ask CNC Block N/E what he thinks of the 4 bolt 400's and he will show you some pics where guys tore the mains right out of them. And they weren't doing the RPM's that you are planning to pull.
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