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Old 08-27-2015, 06:17 AM   #5
ls1nova71
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Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
Re: Coolant Loss 4.8 & 5.3 Vortec GM

This has been a known problem for years. It was a manufacturing defect. Google 'Castech heads' and you'll find out all about them and how to tell if your engine has them. If I recall correctly theyre the 862 heads.
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10
http://ls1tech.com/forums/conversion...71-c-10-a.html
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