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?   

Keep it simple first. Did you pull the t-stat housing yet? Are you running a t-stat?

Keep it simple first. Did you pull the t-stat housing yet? Are you running a t-stat?

Yes I pulled the housing. No water inside at all and no tstat.

U could run a sea strainer with fine mesh , or put on drain taps on the block and flush with hose .


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Right bye the freezer plug there should be a plug put a drain tape it there and drain and flush after you take it out

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This. I'm not sure about BBC, but my Olds has a pipe plug on each side.

U could but getting it in would be a pain in the ass , all blocks will rust if u don’t have antifreeze, just drain and leave the drains open and call it good . If storing in cold climate then pull the thermostat housing off and pore antifreeze in and ur good .


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Anytime brother


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IMHO, 165° is too warm for the conditions. With the lake temp at 65° ish, the temp should be ~130-140°. My 454, logs and snails, wouldn't register on the gauge if the valve was wide open.

Could the logs have sand/blockage also?

By the way,  you can nearly keep your hand on the tstat housing at 140°.
At 180°, about 2 seconds.

I'd say keep looking.

Dan'l

Thermostat


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I have Hardin marine logs an snails and I too them off and some sand came out , so I took the rubber mallet and tapped all over them then blew them out with air then I used a hose , couldn’t believe how much sand came out lol it looked like I was panning for gold lol


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I have Hardin marine logs an snails and I too them off and some sand came out , so I took the rubber mallet and tapped all over them then blew them out with air then I used a hose , couldn’t believe how much sand came out lol it looked like I was panning for gold lol


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Awesome thats what I will do. I took the inlet block off plates, t stat housing and freeze plugs out and cleaned the inside of my motor with a piece of wire , air compressor and water hose and could not believe the amount of sand and pebbles that came out. Would make sense the logs would be just as clogged. Thanks again for all the help.

I pulled the exhaust last night and gave it the ol rubber mallet , water hose and compressed air treatment. Decent amount of sand and some little rocks came out but didnt seam like enough to cause a problem so I kept digging around and found that my water inlet line coming off the jet to T fitting and then the logs was pinched under the motor between the pan and a bolt. Got that freed up and it flows much better now. Water test this weekend to see if its fixed.