I am doing a ls1 to ls2 swap, when I installed the oil pickup tube (from 98 ls1) there was a black o-ring and I reused it, however now that the engine is assembled and in the car with pretty much everything hooked up, a saw another o-ring in the 98 block, a blue one??? Does this pick up tube need two o-rings, whats the deal?
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You mean one was stuck on the tube and one was stuck in the oil pump? It only takes one o-ring. I've only seen blue ones. Did someone do a cam swap on your engine before you got it? For a while people who did cam swaps where double o-ringing the pickup tubes just in case one got pinched but I think then it went away when people realized it wasn't necessary.