GASGZLR

I just finished putting on my centerforce stage 3 clutch and I didn't even get 300 feet away from my house and the slave cyl blew. The plastic on the front that has a lock ring broke off. I figure it was from age. Then I went and got a replacement one from Autozone and it was made out of aluminum with alifetime warranty, and it was machined, and it is nice! Makes you wonder why the freak GM didn't just make em out of billet in the first place. Does any one know if any GM cars ever came with aluminum ones? Also has anyone ever seen a replacement master cyl that is aluminum? I hate how GM makes those things plastic.