I have tried everything under the sun to clean out or &amp;quot;flush&amp;quot; the block on my 77. I was hoping that I would not have to dismantal the entire engine to clean what appears to be sand from the casting or just build up of sand from over the decades. I have replaced the temp gauge in it twice and it still doesn&#039;t regiester the temp; when I poke around in the block, where the sending unit goes, I get alot of sand. I have tried compressed air and flushing solvents; but no luck. If someone has any ideas I would like to hear from you.
Thanks