Review on Fel Pro ES72173 Cylinder Head Bolt by Sam Lee

I bought these when I was removing cylinder heads to rebuild my 2002 Chevrolet Silverado 2500HD 6.0L. For some reason, every repair book I've read strongly recommends (most say mandatory) to use new bolts and not reuse old bolts. I don't know why, but I replaced them anyway. Note. This set only has enough bolts for one head, so two sets are needed for a V8 engine. I made the mistake of not looking at the picture and not realizing that two sets are required to work with either cylinder head.