07-18-2020, 02:57 PM
I'd like to know why stock port 820's with standard thick ring pistons are so much faster today than when they were introduced. In early '62, when you could first actually buy an 820, the guys who bought them were thoroughly discouraged because an Mc7 or an Mc30 would give them a fit-singles or duals. When the guys caught onto the thin ring piston and more carb, it became a bit of a different story. When the ports were properly done, the modified 820's (S&S Oil, Akkerman, Etc.), they were finally turned loose. Stock for stock, the 820 wasn't really faster than the stock 100cc Macs. Why are they today? I'm not VKA, so I don't know how far you can go with port mods. I'm not trying to be a smart a$$, I'm seriously curious.TJ