Now I'll really start something! With the oils being as "good" as they are now, My old High School shop teacher, (and the reason I got into Studes) Also plays with airplanes and a LOT of motorcycles, he said he talked to an "old time" Harley rebuilder, and they use WD-40 for assembly! Otherwise, the rings will not seat, Because of the good lubrication the new oils provide. I dunno' but, Ron (rusty with oil) Johnson rebuilt the 5 cylinder radial engine in his 1941 Ryan PT22 airplane, and did it that way! He is also the same guy that rebuilt an antique midget racer a year ago, never fired it up, (push start) and went "racing" at Danville Illinois last July 4th! I told him he was nucking futz, but his comment was, "What did we learn in Power Lab?" and the answer is, if there is fuel, spark at the right time and compression, it HAS to run! And it did! He might be on the right track on the break in! Jim