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The freeze plugs are the cup style - see pic here
http://replacement.pitstopparts.com/parts/pitstopparts/wizard.jsp?year=1973&make=VO&model=140--002&category=A&part=Freeze+Plug
They are hammered in there pretty good, and also held with JB-Weld. I don't think they're coming out.
To quote form the vendor's site:
"Freeze Plug
45mm
Our current supplier has switched to "cup"-type expansion plugs for this number rather than the "dished"-type plugs that Volvo uses at the factory. Our supplier claims more secure plug retention and fewer leaks with the "cup" style expansion plug. -rbh 8/98 "
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