I started with a bare metal valve cover. I cut a piece of 1/8" chrome (plastic) trim and stuck it onto the valve cover. I then used the same trim tape as a spacer for the next piece of trim I stuck on. I just kept doing that until I thought I had enough "fins". It really didn't need the last three rows on either side as it looked best with just the rows that went from the end and up over the top. Anyway, once I finished with the trim, I painted the whole valve cover with the wrinkle black paint. I wiped the wet paint carefully from the top of the "fins" after applying each coat of paint. It looked pretty good once the paint was wrinkled and dried. The whole treatment was pretty durable. It lasted on the engine for about 4 years or so without anything coming off. I eventually replaced it with a Mopar Performance chrome valve cover. I am not really sure where I put the 'finned' one, but it is likely lost in my shop somewhere. I also did one once (on a big block) using some 'Sport Fury' script that really looked nice. Early 273 engines had aluminum fins fastened to the steel valve covers right from the factory. Anyway, sometimes even the "goofy" ideas turn out OK.