At this time I'm still going thru this book. I'm a big fan of the LS Series engine so of course I bought into this one. If your already an engine builder theres alot of knowledge brought out in this book that will be pretty standard, but if your new to the LS engines then this is really a decent book. It contains part#'s and various tricks of the trade to make your rebuild more streamlined. I can say that I recommend this book based on the fact that any increase in knowledge is a positive thing.