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I am in the process of doing a cam and lifter swap and when I pulled the lifters this is what I found. I am the second owner of the car and I have all the service paper work from the previous owner. The only time the engine was opened was to replace a rocker that puked its needles.
These dont look like stock ls1 lifters to me, but i could be wrong.
From what I've seen, none of the stock lifters are "forked" around the roller wheel like that picture, they fully enclose the wheel like in the first pictures you posted. Those "forked" designs are usually for the larger .750" that the aftermarket lifters will sometimes feature.
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Stock 1999 firehawk lifters? 
