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My first 6.2 was a 1983 civ GMC that had the cast iron rockers. After the lifters failed and starter bolt broke the block beyond repair at about 289k miles and 13 years of driving it everywhere, I took out the cast iron rockers and installed them in a surplus J-Code 6.2 that I refurbished. 2...

So why did gm decide to not make them anymore? What are the common failures? How can they be improved or modified to work better? Anyone have experience with them? What years did gm have them in the 6.2? Etc...