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This as with many things is dependant on how the motor was built. There are variables involved including the RA factor of the finish hone, ring selection etc. It is possible to build a motor that will be broken in within the first 20 minutes. Personally I believe in the more abusive type breakin as well.
Plateau honing alone cuts the breakin time considerably. Taking it further by going with quicker seating rings and lower RA's really can cut things down a lot. Do a search on google for "plateau honing" if you want more info. The machinist we go through can give us just about any RA we request. On a side note, it does help to have round bores. (think torque plate)
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Quick Precision Racing, Inc.
"Always Raising the Bar!"
651-488-7774
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Threaded Mode