I am sorry that I don't know what the designation S-41 means. I do know that in order for that engine to fit in your car without having to make any changes, other then possibly the right side exhaust manifold to accommodate the generator, it must have originally come out of a 1959, 1960, or 1961 car. Paul In a message dated 4/3/2004 11:24:30 PM Eastern Standard Time, thulse@xxxxxxxxxx writes: > To anyone who can help. I know we have all talked about the 413 ID numbers >and what will work in my 1960. I picked up a 413 (ID S-41) at Lowell Howell >today. The engine is in great shape. The rockers have no sludge build up at >all nor does the valley . Will this one work with out changing anything on the >engine? What will I have to change? I know I will have to hook up my generator >set up. I had to hook up a new hard drive tonight and have lost everyone's >e-mail address plus all the old e-mails I had saved. So I will be building my >contact > list up as I can. > > Thanks everyone > Tim > 1960 Imperial > Bakersfield