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One other member had a similar problem. The water jackets were gunked up. Pulling the freeze plugs, cleaning with various tools and a hose got the gunk out well enough to fix it. May be that's what you are left with?




That would be my next move. I didnt see that listed as having been done already. I had a 318 that I ran a flush through and the coolant was nice and clean afterwards. But when I pulled a freeze plug because of a pinhole leak you wouldnt believe how much gunk came out. Enough to where I pulled all the plugs I could reach to clean out more gunk.



1971 Plymouth Satellite
408/904 8 3/4 3.23 SG