I'm looking for some crossover numbers for the Serpentine belt on a 496 Mag. Original Merc part number printed on the belt is 57-865635-001. Looking up the specs on this it shows 2519mm. I cant seem to find anything that exact size searching the net.

Just did some looking up for 57-8656151 which crossed to new 57-863876 for a 496 and comes up at 2830mm

Since yours is 2519mm and assuming it is 6 rib, you could choose between 2515 and 2525

[ATTACH=CONFIG]565540[/ATTACH]

496 belt 865615q01 is 2830mm. You must have a newer model

Delete post, didn't notice it was not correct

This is a 06 496 mag....non HO motor. Ive seen the above part numbers listed for the HO motor.

http://www.marineengineparts.com/mer...q01-serpentine

Sorry my bad, should have noticed that a different part number was used instead of yours. The 10mm difference should handle the issue, tad shorter or longer then required should be able to fit

Its always best to provide engine serial number