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The only problem I have, and it could be an issue, is that with the 383's, the bottom mounting hole does not line up, so I made a 1.5" extension piece of flat metal to extend the bottom bracket so it does not hit the fan. While it looks hokey and backyard, it works. For the RB motors, looking at the geometry, it looks like this is a direct bolt in, butthe fact that the b blocks have less height in them it changes the geometry just enough where the alternator fan hits the bottom bracket.

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