Posting these photos for Rex Loesby:

“I cut the hole in the boot and saw a minor benefit. Another problem was the
difference in CHT between #1 cylinder and the others. As much as 80 degrees.
Gary Vogt at AuCountry in Auburn, CA suggested restricting cooling to #1 with a small plate over the front of the cylinder. I installed the plate and saw an improvement – the CHT difference came down. I increased the size of the plate to cover about 60 percent of the front of #1cylinder and the results were very good. #1 cylinder CHT came up to about 360 degrees and an unexpected benefit was that the other CHT’S came down to within 10 degrees of #1. This type of restrictor plate was suggested to me by Lycon last year on a different aircraft so I felt comfortable with the plate.Rex Loesby”