nebuladds
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The MBX R2 80% comes with a .21 sized engine. The Ultra MBX Pro comes with a .25 sized engine. According to Ofna, it's a "big block" engine. Does that mean that the Ultra MBX pro was designed differently in order to hold a larger engine? Or can this size engine (or larger) fit in the MBX R-2 80% hold a "big block" engine as well?