I've heard that there is a new book in the works by a long time Inliner, but still waiting. As of now only books available for 235s are reprints of 50s books by Calif Bill Fisher and others. Many how to books on other engines are great to have for reference like, Leo's "Chevrolet Inline Six-Cyliner, Power Manual". I also have a copy of HP Books, "How to build your Small Block Chevy". Much of the info contained in these books also pertain to all motor, I refer to them often. If you are a card carring Inline member, you can write to any one of several "Tech Advisors" for any questions you have. These tech advisors are listed in the Club's newsletter, "the 12 Port News".