Plain old stock replacement silent chain with a steel (or cast, I'll have to look) cam sprocket with a stock replacement Melling tensioner. Nothing fancy. I think it was made by Dyno Timing/Dynagear. I bought it a Cotton's many moons ago. If I were going to build a high HP semi-screamer I would go with a Rollmaster Gold. No need for my stock-ish refresh. It'll be a low RPM stock refresh that won't see many more miles before it goes to next owner.