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I bought a 2004 Z06 1 year ago. Thought the engine was stock. I was diagnosing lifter noise and removed the lifters to find these in the picture. They do not look stock for a 2004 LS6. Also, the head bolts were 2 different sizes. According to ARP, the large bolts should all be same size for 2004. Now I think the engine is not all stock, but I think the engine has never come out based on my removal of the transmission recently due to all connectors and wiring being in 100 % stock location and condition. (usually some brittle plastic breaks, or clips dont get put back excatly)
That’s what came out of my 2000 C5 LS1. So it’s definitely a stock GM lifter. The “LS7” GM lifter has the roller wheel fully enclosed. The LS7 came out in 06. So those you show just might be the stockers
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These lifters do not look stock 
