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it is a 21:17, it is the drive know as the Baby King, take a look on the link below, it show the different OMC drives
http://www.allamericandriveservice.com/OMCCobra.html

so my new aluminum headed 532 BBF is nearing completion, we are trying to dumb it down under 600hp and 5500rpms or less and im starting to think Prop selection. so my boat does have the dreaded OMC...