Removed all the oil pan bolts. In the process, I found one loose which was located in the center of the oil pan area. When I got ready to clean them up, I also found one was longer than the all the others (photo #1). I don't know if the longer one was the loose one or not. I do know, the longer one was NOT used in the front (timing cover-photo #2) or the rear (where the bolts can go all the way through the block without bottoming out-photo #3). Machine shop responsible for assembly sold out some years ago so I cannot go back to question anyone there. My question is: did the factory install two different length bolts in the early LA motors, or if all the oil pan bolts were the same length? Thank you.