Hi Robert,
The VT-903's should make it between 400-500K miles with out a problem with proper maintenance. Other than normal service maintenance you should roll the bearings at about 250K miles. The engines were naturally aspirated and produced about 300 Hp on average with some pushing upwards of 450HP depending on your configuration. Overall a good hard working engine in my book.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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