I never heard of al. hard lines. I'm not sure about its application here but in bicyles al. is known for its tendancy to fracture rather than bend a little. Thats why steel and Ti. frames have such a deservedly good reputation.
I considered getting an al engine lid but gave up the idea. I could save more weight by removing the spoiler but I like it too much.
I do know that the early al. radiator style coolers were notorious for bursting after or during winter use. Apparantly they couldn't take the first burst of hot oil into the thick, cold, sluggish cooler oil when the tstat first opened. Of course this was before the multi vis oils became accepted.
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