On Tue, 13 Jul 2004 10:22:10 -0400, "rock_doctor"
wrote:

A rebuild is done when necessary (obviously). I have heard that a 2-stroke
Detroit will last around 2500 to 3000 hrs (according to a specific owner).

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The normal rebuild interval for a naturally aspirated (non-turbo)
Detroit 671 is in the range of 4,000 to 8,000 hours for an engine in
moderate service, that is well maintained, and has not experienced
cooling issues, etc.