Hi Guys,
  First off I will give a little boat info. 1974 Hornet. Mild built chevy 427 BB with logs and snails hooked up to a berkley 12jg. Just had the boat out at the green drink a couple weeks ago without any issues. So this past weekend I took my boat out to parker for some weekend fun and on my first run the boat started to over heat. Pulled her over to the beach and started troubleshooting. First thing I did was check my gate valve which was open and still set at my sweet spot from my previous trips. After doing some test I found the water was coming into the logs and then to the front of the motor inlets but not coming out the tstat ports and out to the exhaust. My understanding is the water jackets through the motor must have corrosion or sand build up after doing some research on here? Im looking to see if there is any solutions to clearing it out without having to pull the motor disassemble it and have it hot tanked. Has anyone used rydelme marine or any type of flush kit with success?