we've all been there before... i dunno what id do if my motor started knocking, etc. probably why it doesnt see much use over 3-3500rpms right now. dont have the money to buy new motors.
Are you sure the knock was not the pump? Just saying...
If you running a mechanical fuel pump try to hear if the sounds is coming from that area. It could be the pump push rod rattling cause the cam lobe or rod is worn.Sent from my iPhone using SoCal Jet Boats