In my quest to build the best 450 dohc racer I can without paying for the high dollar parts I've decided the old worn torsion bars could probably be used with the right cam suited to the engines spec. I always kept the bars and holders together, well,..... Just because. It appears this was a good idea because they are indeed matched, and by selective assembly you could preload them to suit your needs. This would most likely take a lot of parts(spanning different years)?, and a lot of time. And in the end one missed shift might ruin your day. Fun huh?