My cylinder compresion checks revealed them all over the place from 70 -145 psi. Did a leak down test and confirmed a Blown HG. So I take the head off and it looks like it never even sealed properly. I know its hard to tell from pics but does this look like a factory HG? Only found a oem part number but no make. Wondering if PO might have had problems in past and changed it out. Only 60K miles and only figured this out after having so much blowby intermittently and off idle miss. It even lifted right out, no peeling or pulling needed. Looks like a breach at one of the fire rings but it seems I was loosing pressure to adjacent cylinders and to oil galleries that created blowby. My cursory check for flatness doesn't even look that bad. I can't get a 002" feeler thru. I have not done many HG replacements so trying to get some opinions. Thanks