I just purchased a1922 light six which has the manifolds built into the block, I live in the California foothills, it gets hot here, I don't want to have problems with vapor lock. does anyone know if a 24 or 25 has similar issues, are the blocks internal on these years as well? and will a 24 or 25 engine work with everything on the 1922? Or does anyone have any suggestions on how I would modify the current system on my 1922 to avoid the potential vapor locking? I am looking for information and advice before I start spending money. I appreciate all advice and help, thank you! Please call David Roberts at 209-245-4841 or write an email and Terry will answer on Monday morning. Ranchocicada@gmail.com