Quote:
Originally Posted by ls1nova71
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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706 and SOME 862's had this issue. Google it and you'll find a detailed thread on ls1tech. I checked my heads over to be sure, no Castech logo and no cracks.