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-   -   420 engine freshup (https://www.offshoreonly.com/forums/general-boating-discussion/119975-420-engine-freshup.html)

357sr1man 01-08-2006 06:43 PM
420 engine freshup
 
On a mercruiser 420/500hp/525sc about how many hours can you put them before it requires freshening up baring all the proper maintanance has been performed.


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