Demonx2, funny you should say that. Just last week I had a vapor lock on my 69 340 Swinger after filling up. Never happened before, so I did a little research. Winterized fuel could cause a vapor lock, if used in a warm Climent, as in South Florida, where I am. I went back to the gas station and asked about if they were using it. I was told no. I opened the hood for about an hour, and it started up, so I would say those holes in the hood do have a purpose, other than cool air induction. As long as the car was running, I had no issue. Only when I restarted after a long, heated run did I have the vapor lock.