www.crateenginedepot.com has a bunch of very informative charts covering small block, big block, and LS series engines, as well as some miscellaneous charts. The one I really like is the last one on the list (with the blue arrow in the screenshot) that shows the component parts numbers for all the currently available Chevrolet Performance crate engines. This makes it very easy to compare parts differences in each engine! Edited to add: The Component Part Number List for all Performance Engines is an .xls file. For those like me that don't have Microsoft Office, you can view the files in Open Office, a FREE office suite that I use. You can download/install it at https://www.openoffice.org/download/index.html.