Review on Engine Tensioner Sprocket 12680750 Pontiac by Tony Trotter

Although the product appears to work well, it was intentionally made much cheaper than the original factory design. For example, the balance rollers on either side of the heads have a small bearing/roller on the sprockets that the chain runs on, in this kit it's just the sprockets. The metal timing guide with plastic liner on the left bank in this kit is made entirely of plastic. It works, but not for very long I suspect.