Is the dukes 620 cylinder worth it? I can't seem to find any videos of it ANYWHERE! ya I get it it's aftermarket I'm just curious. I had one of his 660 cylinders (the reserve one?) and for an aftermarket cylinder it was really nice. Thick nikasil,smooth ports that where symmetrical and it had a pretty good squish with gasket installed. If the time they put into that was also done with the 620 I may get one.




