Link to Briggs L-Head Service Manual and all other Briggs Manuals

Hello everyone..Can someone tell me the best type of hone to prep a aluminum Briggs block for new rings.Also I have heard that you must use chrome rings on a aluminum engine.I don’t believe this to be true.Can anyone answer this for me.Thanks.
This links to the contemporary L-Head (Flathead) service manual. You can download it from here (all 300+ pages).

L-Head Manual:

Link to DIY GoKarts compendium of all Briggs Manuals: Online Service Manual Resource - DIY Go Kart Forum

Since the original post is like 6 yrs old the link to manual don't work anymore. Is there somewhere else I can download the B&S L-Flathead manual.